Как пишется серотонин правильно серотонин

Serotonin

Skeletal formula of serotonin
Clinical data
Other names 5-HT, 5-Hydroxytryptamine, Enteramine, Thrombocytin, 3-(β-Aminoethyl)-5-hydroxyindole, Thrombotonin
Physiological data
Source tissues raphe nuclei, enterochromaffin cells
Target tissues system-wide
Receptors 5-HT1, 5-HT2, 5-HT3, 5-HT4, 5-HT5, 5-HT6, 5-HT7
Agonists Indirectly: SSRIs, MAOIs
Precursor 5-HTP
Biosynthesis Aromatic L-amino acid decarboxylase
Metabolism MAO
Identifiers

IUPAC name

  • 3-(2-Aminoethyl)-1H-indol-5-ol
CAS Number
  • 50-67-9
PubChem CID
  • 5202
IUPHAR/BPS
  • 5
ChemSpider
  • 5013
KEGG
  • C00780
PDB ligand
  • SRO (PDBe, RCSB PDB)
CompTox Dashboard (EPA)
  • DTXSID8075330 Edit this at Wikidata
ECHA InfoCard 100.000.054 Edit this at Wikidata
Serotonin

Ball-and-stick model of the serotonin molecule
Names
IUPAC name

5-Hydroxytryptamine
Preferred IUPAC name

3-(2-Aminoethyl)-1H-indol-5-ol
Other names

5-Hydroxytryptamine, 5-HT, Enteramine; Thrombocytin, 3-(β-Aminoethyl)-5-hydroxyindole, 3-(2-Aminoethyl)indol-5-ol, Thrombotonin
Identifiers

CAS Number
  • 50-67-9 check

3D model (JSmol)
  • Interactive image
ChEBI
  • CHEBI:28790 check
ChEMBL
  • ChEMBL39 check
ChemSpider
  • 5013 check
ECHA InfoCard 100.000.054 Edit this at Wikidata

IUPHAR/BPS
  • 5
KEGG
  • C00780 check
MeSH Serotonin

PubChem CID
  • 5202
UNII
  • 333DO1RDJY check

CompTox Dashboard (EPA)
  • DTXSID8075330 Edit this at Wikidata

InChI

  • InChI=1S/C10H12N2O/c11-4-3-7-6-12-10-2-1-8(13)5-9(7)10/h1-2,5-6,12-13H,3-4,11H2 check

    Key: QZAYGJVTTNCVMB-UHFFFAOYSA-N check

  • InChI=1/C10H12N2O/c11-4-3-7-6-12-10-2-1-8(13)5-9(7)10/h1-2,5-6,12-13H,3-4,11H2

    Key: QZAYGJVTTNCVMB-UHFFFAOYAX

SMILES

  • C1=CC2=C(C=C1O)C(=CN2)CCN
Properties

Chemical formula

 C10H12N2O
Molar mass 176.215 g/mol
Appearance White powder
Melting point 167.7 °C (333.9 °F; 440.8 K) 121–122 °C (ligroin)[3]
Boiling point 416 ± 30 °C (at 760 Torr)[1]

Solubility in water

 slightly soluble
Acidity (pKa) 10.16 in water at 23.5 °C[2]

Dipole moment

 2.98 D
Hazards
Lethal dose or concentration (LD, LC):

LD50 (median dose)

 750 mg/kg (subcutaneous, rat),[4] 4500 mg/kg (intraperitoneal, rat),[5] 60 mg/kg (oral, rat)
Safety data sheet (SDS) External MSDS

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

check verify (what is check☒ ?)

Infobox references

Serotonin ([6][7][8]) or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter. Its biological function is complex and multifaceted, modulating mood, cognition, reward, learning, memory, and numerous physiological processes such as vomiting and vasoconstriction.[9] Approximately 90% of the serotonin that the body produces is in the intestinal tract.[10]

Biochemically, the indoleamine molecule derives from the amino acid tryptophan, via the (rate-limiting) hydroxylation of the 5 position on the ring (forming the intermediate 5-hydroxytryptophan), and then decarboxylation to produce serotonin.[11] Serotonin is primarily found in the enteric nervous system located in the gastrointestinal tract (GI tract). However, it is also produced in the central nervous system (CNS), specifically in the raphe nuclei located in the brainstem, Merkel cells located in the skin, pulmonary neuroendocrine cells and taste receptor cells in the tongue. Additionally, serotonin is stored in blood platelets and is released during agitation and vasoconstriction, where it then acts as an agonist to other platelets.[12]

Approximately 90% of the human body’s total serotonin is located in the enterochromaffin cells in the GI tract, where it regulates intestinal movements.[13][14] About 8% is found in platelets and 1–2% in the CNS.[15] The serotonin is secreted luminally and basolaterally, which leads to increased serotonin uptake by circulating platelets and activation after stimulation, which gives increased stimulation of myenteric neurons and gastrointestinal motility.[16] The remainder is synthesized in serotonergic neurons of the CNS, where it has various functions. These include the regulation of mood, appetite, and sleep. Serotonin also has some cognitive functions, including memory and learning.

Several classes of antidepressants, such as the SSRIs and the SNRIs among others, interfere with the normal reabsorption of serotonin after it is done with the transmission of the signal, therefore augmenting the neurotransmitter levels in the synapses.

Serotonin secreted from the enterochromaffin cells eventually finds its way out of tissues into the blood. There, it is actively taken up by blood platelets, which store it. When the platelets bind to a clot, they release serotonin, where it can serve as a vasoconstrictor or a vasodilator while regulating hemostasis and blood clotting. In high concentrations, serotonin acts as a vasoconstrictor by contracting endothelial smooth muscle directly or by potentiating the effects of other vasoconstrictors (e.g. angiotensin II, norepinephrine). The vasoconstrictive property is mostly seen in pathologic states affecting the endothelium – such as atherosclerosis or chronic hypertension. In physiologic states, vasodilation occurs through the serotonin mediated release of nitric oxide from endothelial cells. Additionally, it inhibits the release of norepinephrine from adrenergic nerves.[17] Serotonin is also a growth factor for some types of cells, which may give it a role in wound healing. There are various serotonin receptors.

Serotonin is metabolized mainly to 5-HIAA, chiefly by the liver. Metabolism involves first oxidation by monoamine oxidase to the corresponding aldehyde. The rate-limiting step is hydride transfer from serotonin to the flavin cofactor.[18] There follows oxidation by aldehyde dehydrogenase to 5-HIAA, the indole acetic-acid derivative. The latter is then excreted by the kidneys.

Besides mammals, serotonin is found in all bilateral animals including worms and insects,[19] as well as in fungi and in plants.[20] Serotonin’s presence in insect venoms and plant spines serves to cause pain, which is a side-effect of serotonin injection.[21][22] Serotonin is produced by pathogenic amoebae, and its effect in the human gut is diarrhea.[23] Its widespread presence in many seeds and fruits may serve to stimulate the digestive tract into expelling the seeds.[24]

Biological role[edit]

Serotonin is involved in numerous physiological processes, including sleep, thermoregulation, learning and memory, pain, (social) behavior,[25] sexual activity, feeding, motor activity, biological rhythms and possibly others.[26] In less complex animals, such as some invertebrates, serotonin regulates feeding and other processes.[27] In plants serotonin synthesis seems to be associated with stress signals.[20][28]

Cellular effects[edit]

Serotonin primarily acts through its receptors and its effects depend on which cells and tissues express these receptors (see below).[26]

Receptors[edit]

The 5-HT receptors, the receptors for serotonin, are located on the cell membrane of nerve cells and other cell types in animals, and mediate the effects of serotonin as the endogenous ligand and of a broad range of pharmaceutical and psychedelic drugs. Except for the 5-HT3 receptor, a ligand-gated ion channel, all other 5-HT receptors are G-protein-coupled receptors (also called seven-transmembrane, or heptahelical receptors) that activate an intracellular second messenger cascade.[29]

Termination[edit]

Serotonergic action is terminated primarily via uptake of 5-HT from the synapse. This is accomplished through the specific monoamine transporter for 5-HT, SERT, on the presynaptic neuron. Various agents can inhibit 5-HT reuptake, including cocaine, dextromethorphan (an antitussive), tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRIs). A 2006 study conducted by the University of Washington suggested that a newly discovered monoamine transporter, known as PMAT, may account for «a significant percentage of 5-HT clearance».[30]

Contrasting with the high-affinity SERT, the PMAT has been identified as a low-affinity transporter, with an apparent Km of 114 micromoles/l for serotonin; approximately 230 times higher than that of SERT. However, the PMAT, despite its relatively low serotonergic affinity, has a considerably higher transport ‘capacity’ than SERT, «resulting in roughly comparable uptake efficiencies to SERT in heterologous expression systems.»[30] The study also suggests some SSRIs, such as fluoxetine and sertraline anti-depressants, inhibit PMAT but at IC50 values which surpass the therapeutic plasma concentrations by up to four orders of magnitude. Therefore, SSRI monotherapy is «ineffective» in PMAT inhibition. At present, no known pharmaceuticals are known to appreciably inhibit PMAT at normal therapeutic doses. The PMAT also suggestively transports dopamine and norepinephrine, albeit at Km values even higher than that of 5-HT (330–15,000 μmoles/L).[30]

Serotonylation[edit]

Serotonin can also signal through a nonreceptor mechanism called serotonylation, in which serotonin modifies proteins.[31] This process underlies serotonin’s effects upon platelet-forming cells (thrombocytes) in which it links to the modification of signaling enzymes called GTPases that then trigger the release of vesicle contents by exocytosis.[32] A similar process underlies the pancreatic release of insulin.[31]

The effects of serotonin upon vascular smooth muscle tone – the biological function after which serotonin was originally named – depend upon the serotonylation of proteins involved in the contractile apparatus of muscle cells.[33]

Binding profile of serotonin

Receptor Ki (nM)[34] Receptor function[Note 1]
5-HT1 receptor family signals via Gi/o inhibition of adenylyl cyclase.
5-HT1A 3.17 Memory[vague] (agonists ↓); learning[vague] (agonists ↓); anxiety (agonists ↓); depression (agonists ↓); positive, negative, and cognitive symptoms of schizophrenia (partial agonists ↓); analgesia (agonists ↑); aggression (agonists ↓); dopamine release in the prefrontal cortex (agonists ↑); serotonin release and synthesis (agonists ↓)
5-HT1B 4.32 Vasoconstriction (agonists ↑); aggression (agonists ↓); bone mass (↓). Serotonin autoreceptor.
5-HT1D 5.03 Vasoconstriction (agonists ↑)
5-HT1E 7.53
5-HT1F 10
5-HT2 receptor family signals via Gq activation of phospholipase C.
5-HT2A 11.55 Psychedelia (agonists ↑); depression (agonists & antagonists ↓); anxiety (antagonists ↓); positive and negative symptoms of schizophrenia (antagonists ↓); norepinephrine release from the locus coeruleus (antagonists ↑); glutamate release in the prefrontal cortex (agonists ↑); dopamine in the prefrontal cortex (agonists ↑);[35] urinary bladder contractions (agonists ↑)[36]
5-HT2B 8.71 Cardiovascular functioning (agonists increase risk of pulmonary hypertension), empathy (via von Economo neurons[37])
5-HT2C 5.02 Dopamine release into the mesocorticolimbic pathway (agonists ↓); acetylcholine release in the prefrontal cortex (agonists ↑); dopaminergic and noradrenergic activity in the frontal cortex (antagonists ↑);[38] appetite (agonists ↓); antipsychotic effects (agonists ↑); antidepressant effects (agonists & antagonists ↑)
Other 5-HT receptors
5-HT3 593 Emesis (agonists ↑); anxiolysis (antagonists ↑).
5-HT4 125.89 Movement of food across the GI tract (agonists ↑); memory & learning (agonists ↑); antidepressant effects (agonists ↑). Signalling via Gαs activation of adenylyl cyclase.
5-HT5A 251.2 Memory consolidation.[39] Signals via Gi/o inhibition of adenylyl cyclase.
5-HT6 98.41 Cognition (antagonists ↑); antidepressant effects (agonists & antagonists ↑); anxiogenic effects (antagonists ↑[40]). Gs signalling via activating adenylyl cyclase.
5-HT7 8.11 Cognition (antagonists ↑); antidepressant effects (antagonists ↑). Acts by Gs signalling via activating adenylyl cyclase.

Nervous system[edit]

In this drawing of the brain, the serotonergic system is red and the mesolimbic dopamine pathway is blue. There is one collection of serotonergic neurons in the upper brainstem that sends axons upwards to the whole cerebrum, and one collection next to the cerebellum that sends axons downward to the spinal cord. Slightly forward the upper serotonergic neurons is the ventral tegmental area (VTA), which contains dopaminergic neurons. These neurons' axons then connect to the nucleus accumbens, hippocampus, and the frontal cortex. Over the VTA is another collection of dopaminergic cells, the substansia nigra, which send axons to the striatum.

The neurons of the raphe nuclei are the principal source of 5-HT release in the brain.[41] There are nine raphe nuclei, designated B1–B9, which contain the majority of serotonin-containing neurons (some scientists chose to group the nuclei raphes lineares into one nucleus), all of which are located along the midline of the brainstem, and centered on the reticular formation.[42][43] Axons from the neurons of the raphe nuclei form a neurotransmitter system reaching almost every part of the central nervous system. Axons of neurons in the lower raphe nuclei terminate in the cerebellum and spinal cord, while the axons of the higher nuclei spread out in the entire brain.

Ultrastructure and function[edit]

The serotonin nuclei may also be divided into two main groups, the rostral and caudal containing three and four nuclei respectively. The rostral group consists of the caudal linear nuclei (B8), the dorsal raphe nuclei (B6 and B7) and the median raphe nuclei (B5, B8 and B9), that project into multiple cortical and subcortical structures. The caudal group consists of the nucleus raphe magnus (B3), raphe obscurus nucleus (B2), raphe pallidus nucleus (B1), and lateral medullary reticular formation, that project into the brainstem.[44]

The serotonergic pathway is involved in sensorimotor function, with pathways projecting both into cortical (Dorsal and Median Raphe Nuclei), subcortical, and spinal areas involved in motor activity. Pharmacological manipulation suggests that serotonergic activity increases with motor activity while firing rates of serotonergic neurons increase with intense visual stimuli. Animal models suggest that kainate signaling negatively regulates serotonin actions in the retina, with possible implications for the control of the visual system.[45] The descending projections form a pathway that inhibits pain called the «descending inhibitory pathway» that may be relevant to a disorder such as fibromyalgia, migraine, and other pain disorders, and the efficacy of antidepressants in them.[46]

Serotonergic projections from the caudal nuclei are involved in regulating mood and emotion, and hypo-[47] or hyper-serotonergic[48] states may be involved in depression and sickness behavior.

Microanatomy[edit]

Serotonin is released into the synapse, or space between neurons, and diffuses over a relatively wide gap (>20 nm) to activate 5-HT receptors located on the dendrites, cell bodies, and presynaptic terminals of adjacent neurons.

When humans smell food, dopamine is released to increase the appetite. But, unlike in worms, serotonin does not increase anticipatory behaviour in humans; instead, the serotonin released while consuming activates 5-HT2C receptors on dopamine-producing cells. This halts their dopamine release, and thereby serotonin decreases appetite. Drugs that block 5-HT2C receptors make the body unable to recognize when it is no longer hungry or otherwise in need of nutrients, and are associated with weight gain,[49] especially in people with a low number of receptors.[50] The expression of 5-HT2C receptors in the hippocampus follows a diurnal rhythm,[51] just as the serotonin release in the ventromedial nucleus, which is characterised by a peak at morning when the motivation to eat is strongest.[52]

In macaques, alpha males have twice the level of serotonin in the brain as subordinate males and females (measured by the concentration of 5-HIAA in the cerebrospinal fluid (CSF)). Dominance status and CSF serotonin levels appear to be positively correlated. When dominant males were removed from such groups, subordinate males begin competing for dominance. Once new dominance hierarchies were established, serotonin levels of the new dominant individuals also increased to double those in subordinate males and females. The reason why serotonin levels are only high in dominant males, but not dominant females has not yet been established.[53]

In humans, levels of 5-HT1A receptor inhibition in the brain show negative correlation with aggression,[54] and a mutation in the gene that codes for the 5-HT2A receptor may double the risk of suicide for those with that genotype.[55] Serotonin in the brain is not usually degraded after use, but is collected by serotonergic neurons by serotonin transporters on their cell surfaces. Studies have revealed nearly 10% of total variance in anxiety-related personality depends on variations in the description of where, when and how many serotonin transporters the neurons should deploy.[56]

Psychological influences[edit]

Serotonin has been implicated in cognition, mood, anxiety and psychosis, but strong clarity has not been achieved.[57][58]

Autism spectrum disorder (ASD)[edit]

In regards to research for neurotransmitters and effects on patients with Autism Spectrum Disorder (ASD), 5-HT has been studied the most in terms of research efforts and investigations.[59] As noted, 5-HT signaling does facilitate many neural processes including that of neurogenesis, cell migration and survival, synaptogenesis, and synaptic plasticity.[59] It was noted that 45% of tested ASD subjects contained high levels of 5-HT in their blood.[59] In addition, investigations performed on ASD-like animal models reported that hyperserotonemia significantly reduced the motivation for social interest through inhibition of separation distress, which could be related in the ASD patients that have social impairments.[59]

Outside the nervous system[edit]

In the digestive tract (emetic)[edit]

Serotonin regulates gastrointestinal function. The gut is surrounded by enterochromaffin cells, which release serotonin in response to food in the lumen. This makes the gut contract around the food. Platelets in the veins draining the gut collect excess serotonin. There are often serotonin abnormalities in gastrointestinal disorders such as constipation and irritable bowel syndrome.[60]

If irritants are present in the food, the enterochromaffin cells release more serotonin to make the gut move faster, i.e., to cause diarrhea, so the gut is emptied of the noxious substance. If serotonin is released in the blood faster than the platelets can absorb it, the level of free serotonin in the blood is increased. This activates 5-HT3 receptors in the chemoreceptor trigger zone that stimulate vomiting.[61] Thus, drugs and toxins stimulate serotonin release from enterochromaffin cells in the gut wall. The enterochromaffin cells not only react to bad food but are also very sensitive to irradiation and cancer chemotherapy. Drugs that block 5HT3 are very effective in controlling the nausea and vomiting produced by cancer treatment, and are considered the gold standard for this purpose.[62]

Bone metabolism[edit]

In mice and humans, alterations in serotonin levels and signalling have been shown to regulate bone mass.[63][64][65][66] Mice that lack brain serotonin have osteopenia, while mice that lack gut serotonin have high bone density. In humans, increased blood serotonin levels have been shown to be significant negative predictor of low bone density. Serotonin can also be synthesized, albeit at very low levels, in the bone cells. It mediates its actions on bone cells using three different receptors. Through 5-HT1B receptors, it negatively regulates bone mass, while it does so positively through 5-HT2B receptors and 5-HT2C receptors. There is very delicate balance between physiological role of gut serotonin and its pathology. Increase in the extracellular content of serotonin results in a complex relay of signals in the osteoblasts culminating in FoxO1/ Creb and ATF4 dependent transcriptional events.[67] Following the 2008 findings that gut serotonin regulates bone mass, the mechanistic investigations into what regulates serotonin synthesis from the gut in the regulation of bone mass have started. Piezo1 has been shown to sense RNA in the gut and relay this information through serotonin synthesis to the bone by acting as a sensor of single-stranded RNA (ssRNA) governing 5-HT production. Intestinal epithelium-specific deletion of mouse Piezo1 profoundly disturbed gut peristalsis, impeded experimental colitis, and suppressed serum 5-HT levels. Because of systemic 5-HT deficiency, conditional knockout of Piezo1 increased bone formation. Notably, fecal ssRNA was identified as a natural Piezo1 ligand, and ssRNA-stimulated 5-HT synthesis from the gut was evoked in a MyD88/TRIF-independent manner. Colonic infusion of RNase A suppressed gut motility and increased bone mass. These findings suggest gut ssRNA as a master determinant of systemic 5-HT levels, indicating the ssRNA-Piezo1 axis as a potential prophylactic target for treatment of bone and gut disorders. Studies in 2008, 2010 and 2019 have opened the potential for serotonin research to treat bone mass disorders.[68][69]

Organ development[edit]

Since serotonin signals resource availability it is not surprising that it affects organ development. Many human and animal studies have shown that nutrition in early life can influence, in adulthood, such things as body fatness, blood lipids, blood pressure, atherosclerosis, behavior, learning, and longevity.[70][71][72] Rodent experiment shows that neonatal exposure to SSRIs makes persistent changes in the serotonergic transmission of the brain resulting in behavioral changes,[73][74] which are reversed by treatment with antidepressants.[75] By treating normal and knockout mice lacking the serotonin transporter with fluoxetine scientists showed that normal emotional reactions in adulthood, like a short latency to escape foot shocks and inclination to explore new environments were dependent on active serotonin transporters during the neonatal period.[76][77]

Human serotonin can also act as a growth factor directly. Liver damage increases cellular expression of 5-HT2A and 5-HT2B receptors, mediating liver compensatory regrowth (see Liver § Regeneration and transplantation)[78] Serotonin present in the blood then stimulates cellular growth to repair liver damage.[79]
5HT2B receptors also activate osteocytes, which build up bone[80] However, serotonin also inhibits osteoblasts, through 5-HT1B receptors.[81]

Cardiovascular growth factor[edit]

Serotonin, in addition, evokes endothelial nitric oxide synthase activation and stimulates, through a 5-HT1B receptor-mediated mechanism, the phosphorylation of p44/p42 mitogen-activated protein kinase activation in bovine aortic endothelial cell cultures.[clarification needed][82] In blood, serotonin is collected from plasma by platelets, which store it. It is thus active wherever platelets bind in damaged tissue, as a vasoconstrictor to stop bleeding, and also as a fibrocyte mitotic (growth factor), to aid healing.[83]

Skin[edit]

Serotonin is also produced by Merkel cells which are part of the somatosensory system.[84]

Lungs[edit]

Pulmonary neuroendocrine cells are specialized epithelial cells that occur as solitary cells or as clusters called neuroepithelial bodies in the lung. Pulmonary neuroendocrine cells are also known as Kulchitsky cells or K cells.[85]

Pharmacology[edit]

Several classes of drugs target the 5-HT system, including some antidepressants, antipsychotics, anxiolytics, antiemetics, and antimigraine drugs, as well as, the psychedelic drugs and empathogens.

Mechanism of action[edit]

At rest, serotonin is stored within the vesicles of presynaptic neurons. When stimulated by nerve impulses, serotonin is released as a neurotransmitter into the synapse, reversibly binding to the postsynaptic receptor to induce a nerve impulse on the postsynaptic neuron. Serotonin can also bind to auto-receptors on the presynaptic neuron to regulate the synthesis and release of serotonin. Normally serotonin is taken back into the presynaptic neuron to stop its action, then reused or broken down by monoamine oxidase.[86]

Psychedelic drugs[edit]

The serotonergic psychedelic drugs psilocin/psilocybin, DMT, mescaline, psychedelic mushroom and LSD are agonists, primarily at 5HT2A/2C receptors.[87][88][89] The empathogen-entactogen MDMA releases serotonin from synaptic vesicles of neurons.[90]

Antidepressants[edit]

Drugs that alter serotonin levels are used in treating depression, generalized anxiety disorder, and social phobia. Monoamine oxidase inhibitors (MAOIs) prevent the breakdown of monoamine neurotransmitters (including serotonin), and therefore increase concentrations of the neurotransmitter in the brain. MAOI therapy is associated with many adverse drug reactions, and patients are at risk of hypertensive emergency triggered by foods with high tyramine content, and certain drugs. Some drugs inhibit the re-uptake of serotonin, making it stay in the synaptic cleft longer. The tricyclic antidepressants (TCAs) inhibit the reuptake of both serotonin and norepinephrine. The newer selective serotonin reuptake inhibitors (SSRIs) have fewer side-effects and fewer interactions with other drugs.[91]

Certain SSRI medications have been shown to lower serotonin levels below the baseline after chronic use, despite initial increases.[92] The 5-HTTLPR gene codes for the number of serotonin transporters in the brain, with more serotonin transporters causing decreased duration and magnitude of serotonergic signaling.[93] The 5-HTTLPR polymorphism (l/l) causing more serotonin transporters to be formed is also found to be more resilient against depression and anxiety.[94][95]

Serotonin syndrome[edit]

Extremely high levels of serotonin can cause a condition known as serotonin syndrome, with toxic and potentially fatal effects. In practice, such toxic levels are essentially impossible to reach through an overdose of a single antidepressant drug, but require a combination of serotonergic agents, such as an SSRI with a MAOI, which may occur in therapeutic doses.[96][97] The intensity of the symptoms of serotonin syndrome vary over a wide spectrum, and the milder forms are seen even at nontoxic levels.[98] It is estimated that 14% of patients experiencing serotonin syndrome overdose on SSRIs; meanwhile the fatality rate is between 2% to 12%.[96][99][100]

Antiemetics[edit]

Some 5-HT3 antagonists, such as ondansetron, granisetron, and tropisetron, are important antiemetic agents. They are particularly important in treating the nausea and vomiting that occur during anticancer chemotherapy using cytotoxic drugs. Another application is in the treatment of postoperative nausea and vomiting.

Other[edit]

Some serotonergic agonist drugs cause fibrosis anywhere in the body, particularly the syndrome of retroperitoneal fibrosis, as well as cardiac valve fibrosis.[101]
In the past, three groups of serotonergic drugs have been epidemiologically linked with these syndromes. These are the serotonergic vasoconstrictive antimigraine drugs (ergotamine and methysergide),[101] the serotonergic appetite suppressant drugs (fenfluramine, chlorphentermine, and aminorex), and certain anti-Parkinsonian dopaminergic agonists, which also stimulate serotonergic 5-HT2B receptors. These include pergolide and cabergoline, but not the more dopamine-specific lisuride.[102]

As with fenfluramine, some of these drugs have been withdrawn from the market after groups taking them showed a statistical increase of one or more of the side effects described. An example is pergolide. The drug was declining in use since it was reported in 2003 to be associated with cardiac fibrosis.[103]

Two independent studies published in The New England Journal of Medicine in January 2007 implicated pergolide, along with cabergoline, in causing valvular heart disease.[104][105] As a result of this, the FDA removed pergolide from the United States market in March 2007.[106] (Since cabergoline is not approved in the United States for Parkinson’s Disease, but for hyperprolactinemia, the drug remains on the market. Treatment for hyperprolactinemia requires lower doses than that for Parkinson’s Disease, diminishing the risk of valvular heart disease).[107]

Methyl-tryptamines and hallucinogens[edit]

For details on tryptamine neurotransmitters in humans, see Trace amine.

Several plants contain serotonin together with a family of related tryptamines that are methylated at the amino (NH2) and (OH) groups, are N-oxides, or miss the OH group. These compounds do reach the brain, although some portion of them are metabolized by monoamine oxidase enzymes (mainly MAO-A) in the liver. Examples are plants from the genus Anadenanthera that are used in the hallucinogenic yopo snuff. These compounds are widely present in the leaves of many plants, and may serve as deterrents for animal ingestion. Serotonin occurs in several mushrooms of the genus Panaeolus.[108]

Comparative biology and evolution[edit]

Unicellular organisms[edit]

Serotonin is used by a variety of single-cell organisms for various purposes. SSRIs have been found to be toxic to algae.[109] The gastrointestinal parasite Entamoeba histolytica secretes serotonin, causing a sustained secretory diarrhea in some people.[23][110] Patients infected with E. histolytica have been found to have highly elevated serum serotonin levels, which returned to normal following resolution of the infection.[111] E. histolytica also responds to the presence of serotonin by becoming more virulent.[112] This means serotonin secretion not only serves to increase the spread of enteamoebas by giving the host diarrhea but also serves to coordinate their behaviour according to their population density, a phenomenon known as quorum sensing. Outside the gut of a host, there is nothing that the entoamoebas provoke to release serotonin, hence the serotonin concentration is very low. Low serotonin signals to the entoamoebas they are outside a host and they become less virulent to conserve energy. When they enter a new host, they multiply in the gut, and become more virulent as the enterochromaffine cells get provoked by them and the serotonin concentration increases.

Edible plants and mushrooms[edit]

In drying seeds, serotonin production is a way to get rid of the buildup of poisonous ammonia. The ammonia is collected and placed in the indole part of L-tryptophan, which is then decarboxylated by tryptophan decarboxylase to give tryptamine, which is then hydroxylated by a cytochrome P450 monooxygenase, yielding serotonin.[113]

However, since serotonin is a major gastrointestinal tract modulator, it may be produced in the fruits of plants as a way of speeding the passage of seeds through the digestive tract, in the same way as many well-known seed and fruit associated laxatives. Serotonin is found in mushrooms, fruits, and vegetables. The highest values of 25–400 mg/kg have been found in nuts of the walnut (Juglans) and hickory (Carya) genera. Serotonin concentrations of 3–30 mg/kg have been found in plantains, pineapples, banana, kiwifruit, plums, and tomatoes. Moderate levels from 0.1–3 mg/kg have been found in a wide range of tested vegetables.[24][20]

Serotonin is one compound of the poison contained in stinging nettles (Urtica dioica), where it causes pain on injection in the same manner as its presence in insect venoms (see below).[22] It is also naturally found in Paramuricea clavata, or the Red Sea Fan.[114]

Serotonin and tryptophan have been found in chocolate with varying cocoa contents. The highest serotonin content (2.93 µg/g) was found in chocolate with 85% cocoa, and the highest tryptophan content (13.27–13.34 µg/g) was found in 70–85% cocoa. The intermediate in the synthesis from tryptophan to serotonin, 5-hydroxytryptophan, was not found.[115]

Root development in Arabidopsis thaliana is stimulated and modulated by serotonin — in various ways at various concentrations.[116]

Serotonin serves as a plant defense chemical against fungi. When infected with Fusarium crown rot (Fusarium pseudograminearum), wheat (Triticum aestivum) greatly increases its production of tryptophan to synthesize new serotonin.[117] The function of this is poorly understood[117] but wheat also produces serotonin when infected by Stagonospora nodorum — in that case to retard spore production.[118] The model cereal Brachypodium distachyon — used as a research substitute for wheat and other production cereals — also produces serotonin, coumaroyl-serotonin, and feruloyl-serotonin in response to F. graminearum. This produces a slight antimicrobial effect. B. distachyon produces more serotonin (and conjugates) in response to deoxynivalenol (DON)-producing F. graminearum than non-DON-producing.[119] Solanum lycopersicum produces many AA conjugates — including several of serotonin — in its leaves, stems, and roots in response to Ralstonia solanacearum infection.[120]

Invertebrates[edit]

Serotonin functions as a neurotransmitter in the nervous systems of most animals.

Nematodes[edit]

For example, in the roundworm Caenorhabditis elegans, which feeds on bacteria, serotonin is released as a signal in response to positive events, such as finding a new source of food or in male animals finding a female with which to mate.[121] When a well-fed worm feels bacteria on its cuticle, dopamine is released, which slows it down; if it is starved, serotonin also is released, which slows the animal down further. This mechanism increases the amount of time animals spend in the presence of food.[122] The released serotonin activates the muscles used for feeding, while octopamine suppresses them.[123][124] Serotonin diffuses to serotonin-sensitive neurons, which control the animal’s perception of nutrient availability.

Decapods[edit]

If lobsters are injected with serotonin, they behave like dominant individuals whereas octopamine causes subordinate behavior.[25] A crayfish that is frightened may flip its tail to flee, and the effect of serotonin on this behavior depends largely on the animal’s social status. Serotonin inhibits the fleeing reaction in subordinates, but enhances it in socially dominant or isolated individuals. The reason for this is social experience alters the proportion between serotonin receptors (5-HT receptors) that have opposing effects on the fight-or-flight response.[clarification needed] The effect of 5-HT1 receptors predominates in subordinate animals, while 5-HT2 receptors predominates in dominants.[125]

In venoms[edit]

Serotonin is a common component of invertebrate venoms, salivary glands, nervous tissues, and various other tissues, across molluscs, insects, crustaceans, scorpions, various kinds of worms, and jellyfish.[22] Adult Rhodnius prolixus — hematophagous on vertebrates — secrete lipocalins into the wound during feeding. In 2003 these lipocalins were demonstrated to sequester serotonin to prevent vasoconstriction (and possibly coagulation) in the host.[126]

Insects[edit]

Serotonin is evolutionarily conserved and appears across the animal kingdom. It is seen in insect processes in roles similar to in the human central nervous system, such as memory, appetite, sleep, and behavior.[127][19] Some circuits in mushroom bodies are serotonergic.[128] (See specific Drosophila example below, §Dipterans.)

Acrididae[edit]

Locust swarming is initiated but not maintained by serotonin,[129] with release being triggered by tactile contact between individuals.[130] This transforms social preference from aversion to a gregarious state that enables coherent groups.[131][130][129] Learning in flies and honeybees is affected by the presence of serotonin.[132][133]

Role in insecticides[edit]

Insect 5-HT receptors have similar sequences to the vertebrate versions, but pharmacological differences have been seen. Invertebrate drug response has been far less characterized than mammalian pharmacology and the potential for species selective insecticides has been discussed.[134]

Hymenopterans[edit]

Wasps and hornets have serotonin in their venom,[135] which causes pain and inflammation[21][22] as do scorpions.[136][22] Pheidole dentata takes on more and more tasks in the colony as it gets older, which requires it to respond to more and more olfactory cues in the course of performing them. This olfactory response broadening was demonstrated to go along with increased serotonin and dopamine, but not octopamine in 2006.[137]

Dipterans[edit]

If flies are fed serotonin, they are more aggressive; flies depleted of serotonin still exhibit aggression, but they do so much less frequently.[138] In their crops it plays a vital role in digestive motility produced by contraction. Serotonin that acts on the crop is exogenous to the crop itself and 2012 research suggested that it probably originated in the serotonin neural plexus in the thoracic-abdominal synganglion.[139] In 2011 a Drosophila serotonergic mushroom body was found to work in concert with Amnesiac to form memories.[128] In 2007 serotonin was found to promote aggression in Diptera, which was counteracted by neuropeptide F — a surprising find given that they both promote courtship, which is usually similar to aggression in most respects.[128]

Vertebrates[edit]

Serotonin, also referred to as 5-hydroxytryptamine (5-HT), is a neurotransmitter most known for its involvement in mood disorders in humans. It is also a widely present neuromodulator among vertebrates and invertebrates.[140] Serotonin has been found having associations with many physiological systems such as cardiovascular, thermoregulation, and behavioral functions, including: circadian rhythm, appetite, aggressive and sexual behavior, sensorimotor reactivity and learning, and pain sensitivity.[141] Serotonin’s function in neurological systems along with specific behaviors among vertebrates found to be strongly associated with serotonin will be further discussed. Two relevant case studies are also mentioned regarding serotonin development involving teleost fish and mice.

In mammals, 5-HT is highly concentrated in the substantia nigra, ventral tegmental area and raphe nuclei. Lesser concentrated areas include other brain regions and the spinal cord.[140] 5-HT neurons are also shown to be highly branched, indicating that they are structurally prominent for influencing multiple areas of the CNS at the same time, although this trend is exclusive solely to mammals.[141]

5-HT System in Vertebrates[edit]

Vertebrates are multicellular organisms in the phylum Chordata that possess a backbone and a nervous system. This includes mammals, fish, reptiles, birds, etc. In humans, the nervous system is composed of the central and peripheral nervous system, with little known about the specific mechanisms of neurotransmitters in most other vertebrates. However, it is known that while serotonin is involved in stress and behavioral responses, it is also important in cognitive functions.[140] Brain organization in most vertebrates includes 5-HT cells in the hindbrain.[140] In addition to this, 5-HT is often found in other sections of the brain in non-placental vertebrates, including the basal forebrain and pretectum.[142] Since location of serotonin receptors contribute to behavioral responses, this suggests serotonin is part of specific pathways in non-placental vertebrates that are not present in amniotic organisms.[143] Teleost fish and mice are organisms most often used to study the connection between serotonin and vertebrate behavior. Both organisms show similarities in the effect of serotonin on behavior, but differ in the mechanism in which the responses occur.

Dogs / Canine species[edit]

There are few studies of serotonin in dogs. One study reported serotonin values were higher at dawn than at dusk.[144] In another study, serum 5-HT levels did not seem to be associated with dogs’ behavioural response to a stressful situation.[145] Urinary serotonin/creatinine ratio in bitches tended to be higher 4 weeks after surgery. In addition, serotonin was positively correlated with both cortisol and progesterone but not with testosterone after ovariohysterectomy.[146]

Teleost Fish[edit]

Like non-placental vertebrates, teleost fish also possess 5-HT cells in other sections of the brain, including the basal forebrain.[142] Danio rerio (zebra fish) are a species of teleost fish often used for studying serotonin within the brain. Despite much being unknown about serotonergic systems in vertebrates, the importance in moderating stress and social interaction is known.[147] It is hypothesized that AVT and CRF cooperate with serotonin in the hypothalamic-pituitary-interrenal axis.[142] These neuropeptides influence the plasticity of the teleost, affecting its ability to change and respond to its environment. Subordinate fish in social settings show a drastic increase in 5-HT concentrations.[147] High levels of 5-HT long term influence the inhibition of aggression in subordinate fish.[147]

Mice[edit]

Researchers at the Department of Pharmacology and Medical Chemistry used serotonergic drugs on male mice to study the effects of selected drugs on their behavior.[148] Mice in isolation exhibit increased levels of agonistic behavior towards one another. Results found that serotonergic drugs reduce aggression in isolated mice while simultaneously increasing social interaction.[148] Each of the treatments use a different mechanism for targeting aggression, but ultimately all have the same outcome. While the study shows that serotonergic drugs successfully target serotonin receptors, it does not show specifics of the mechanisms that affect behavior, as all types of drugs tended to reduce aggression in isolated male mice.[148] Aggressive mice kept out of isolation may respond differently to changes in serotonin reuptake.

Behavior[edit]

Like in humans, serotonin is extremely involved in regulating behavior in most other vertebrates. This includes not only response and social behaviors, but also influencing mood. Defects in serotonin pathways can lead to intense variations in mood, as well as symptoms of mood disorders, which can be present in more than just humans.

[edit]

One of the most researched aspects of social interaction in which serotonin is involved is aggression. Aggression is regulated by the 5-HT system, as serotonin levels can both induce or inhibit aggressive behaviors, as seen in mice (see section on Mice) and crabs.[148] While this is widely accepted, it is unknown if serotonin interacts directly or indirectly with parts of the brain influencing aggression and other behaviors.[140] Studies of serotonin levels show that they drastically increase and decrease during social interactions, and they generally correlate with inhibiting or inciting aggressive behavior.[149] The exact mechanism of serotonin influencing social behaviors is unknown, as pathways in the 5-HT system in various vertebrates can differ greatly.[140]

Response to Stimuli[edit]

Serotonin is important in environmental response pathways, along with other neurotransmitters.[150] Specifically, it has been found to be involved in auditory processing in social settings, as primary sensory systems are connected to social interactions.[151] Serotonin is found in the IC structure of the midbrain, which processes specie specific and non-specific social interactions and vocalizations.[151] It also receives acoustic projections that convey signals to auditory processing regions.[151] Research has proposed that serotonin shapes the auditory information being received by the IC and therefore is influential in the responses to auditory stimuli.[151] This can influence how an organism responds to the sounds of predatory or other impactful species in their environment, as serotonin uptake can influence aggression and/or social interaction.

Mood[edit]

We can describe mood not as specific to an emotional status, but as associated with a relatively long-lasting emotional state. Serotonin’s association with mood is most known for various forms of depression and bipolar disorders in humans.[141] Disorders caused by serotonergic activity potentially contribute to the many symptoms of major depression, such as overall mood, activity, suicidal thoughts and sexual and cognitive dysfunction. Selective serotonin reuptake inhibitors (SSRI’s) are a class of drugs demonstrated to be an effective treatment in major depressive disorder and are the most prescribed class of antidepressants. SSRI’s function is to block the reuptake of serotonin, making more serotonin available to absorb by the receiving neuron. Animals have been studied for decades in order to understand depressive behavior among species. One of the most familiar studies, the forced swimming test (FST), was performed to measure potential antidepressant activity.[141] Rats were placed in an inescapable container of water, at which point time spent immobile and number of active behaviors (such as splashing or climbing) were compared before and after a panel of anti-depressant drugs were administered. Antidepressants that selectively inhibit NE reuptake were shown to reduce immobility and selectively increase climbing without affecting swimming. However, results of the SSRI’s also show reduced immobility but increased swimming without affecting climbing. This study demonstrated the importance of behavioral tests for antidepressants, as they can detect drugs with an effect on core behavior along with behavioral components of species.[141]

Growth and reproduction[edit]

In the nematode C. elegans, artificial depletion of serotonin or the increase of octopamine cues behavior typical of a low-food environment: C. elegans becomes more active, and mating and egg-laying are suppressed, while the opposite occurs if serotonin is increased or octopamine is decreased in this animal.[27] Serotonin is necessary for normal nematode male mating behavior,[152] and the inclination to leave food to search for a mate.[153] The serotonergic signaling used to adapt the worm’s behaviour to fast changes in the environment affects insulin-like signaling and the TGF beta signaling pathway,[154] which control long-term adaption.

In the fruit fly insulin both regulates blood sugar as well as acting as a growth factor. Thus, in the fruit fly, serotonergic neurons regulate the adult body size by affecting insulin secretion.[155][156] Serotonin has also been identified as the trigger for swarm behavior in locusts.[131] In humans, though insulin regulates blood sugar and IGF regulates growth, serotonin controls the release of both hormones, modulating insulin release from the beta cells in the pancreas through serotonylation of GTPase signaling proteins.[31] Exposure to SSRIs during pregnancy reduces fetal growth.[157]

Genetically altered C. elegans worms that lack serotonin have an increased reproductive lifespan, may become obese, and sometimes present with arrested development at a dormant larval state.[158][159]

Aging and age-related phenotypes[edit]

Serotonin is known to regulate aging, learning and memory. The first evidence comes from the study of longevity in C. elegans.[154] During early phase of aging[vague], the level of serotonin increases, which alters locomotory behaviors and associative memory.[160] The effect is restored by mutations and drugs (including mianserin and methiothepin) that inhibit serotonin receptors. The observation does not contradict with the notion that the serotonin level goes down in mammals and humans, which is typically seen in late but not early[vague] phase of aging.

Biochemical mechanisms[edit]

Biosynthesis[edit]

On top an L-tryptophan molecule with an arrow down to a 5-HTP molecule. Tryptophan hydroxylase catalyses this reaction with help of O2 and tetrahydrobiopterin, which becomes water and dihydrobiopterin. From the 5-HTP molecule goes an arrow down to a serotonin molecule. Aromatic L-amino acid decarboxylase or 5-Hydroxytryptophan decarboxylase catalyses this reaction with help of pyridoxal phosphate. From the serotonin molecule goes an arrow to a 5-HIAA molecule at the bottom ot the image. Monoamine oxidase catalyses this reaction, in the process O2 and water is consumed, and ammonia and hydrogen peroxide is produced.

The pathway for the synthesis of serotonin from tryptophan.

In animals including humans, serotonin is synthesized from the amino acid L-tryptophan by a short metabolic pathway consisting of two enzymes, tryptophan hydroxylase (TPH) and aromatic amino acid decarboxylase (DDC), and the coenzyme pyridoxal phosphate. The TPH-mediated reaction is the rate-limiting step in the pathway.
TPH has been shown to exist in two forms: TPH1, found in several tissues, and TPH2, which is a neuron-specific isoform.[161]

Serotonin can be synthesized from tryptophan in the lab using Aspergillus niger and Psilocybe coprophila as catalysts. The first phase to 5-hydroxytryptophan would require letting tryptophan sit in ethanol and water for 7 days, then mixing in enough HCl (or other acid) to bring the pH to 3, and then adding NaOH to make a pH of 13 for 1 hour. Asperigillus niger would be the catalyst for this first phase. The second phase to synthesizing tryptophan itself from the 5-hydroxytryptophan intermediate would require adding ethanol and water, and letting sit for 30 days this time. The next two steps would be the same as the first phase: adding HCl to make the pH = 3, and then adding NaOH to make the pH very basic at 13 for 1 hour. This phase uses the Psilocybe coprophila as the catalyst for the reaction.[162]

Serotonin taken orally does not pass into the serotonergic pathways of the central nervous system, because it does not cross the blood–brain barrier.[9] However, tryptophan and its metabolite 5-hydroxytryptophan (5-HTP), from which serotonin is synthesized, do cross the blood–brain barrier. These agents are available as dietary supplements and in various foods, and may be effective serotonergic agents.
One product of serotonin breakdown is 5-hydroxyindoleacetic acid (5-HIAA), which is excreted in the urine. Serotonin and 5-HIAA are sometimes produced in excess amounts by certain tumors or cancers, and levels of these substances may be measured in the urine to test for these tumors.

Analytical chemistry[edit]

Indium tin oxide is recommended for the electrode material in electrochemical investigation of concentrations produced, detected, or consumed by microbes.[163] A mass spectrometry technique was developed in 1994 to measure the molecular weight of both natural and synthetic serotonins.[164]

History and etymology[edit]

It had been known to physiologists for over a century that a vasoconstrictor material appears in serum when blood was allowed to clot.[165] In 1935, Italian Vittorio Erspamer showed an extract from enterochromaffin cells made intestines contract. Some believed it contained adrenaline, but two years later, Erspamer was able to show it was a previously unknown amine, which he named «enteramine».[166][167] In 1948, Maurice M. Rapport, Arda Green, and Irvine Page of the Cleveland Clinic discovered a vasoconstrictor substance in blood serum, and since it was a serum agent affecting vascular tone, they named it serotonin.[168]

In 1952, enteramine was shown to be the same substance as serotonin, and as the broad range of physiological roles was elucidated, the abbreviation 5-HT of the proper chemical name 5-hydroxytryptamine became the preferred name in the pharmacological field.[169] Synonyms of serotonin include: 5-hydroxytriptamine, thrombotin, enteramin, substance DS, and 3-(β-Aminoethyl)-5-hydroxyindole.[170] In 1953, Betty Twarog and Page discovered serotonin in the central nervous system.[171] Page regarded Erspamer’s work on Octopus vulgaris, Discoglossus pictus, Hexaplex trunculus, Bolinus brandaris, Sepia, Mytilus, and Ostrea as valid and fundamental to understanding this newly identified substance, but regarded his earlier results in various models — especially those from rat blood — to be too confounded by the presence of other MAs, including some other vasoactives.[172]

See also[edit]

  • HIOC

Notes[edit]

  1. ^ References for the functions of these receptors are available on the wikipedia pages for the specific receptor in question

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Further reading[edit]

  • Gutknecht L, Jacob C, Strobel A, Kriegebaum C, Müller J, Zeng Y, et al. (June 2007). «Tryptophan hydroxylase-2 gene variation influences personality traits and disorders related to emotional dysregulation». The International Journal of Neuropsychopharmacology. 10 (3): 309–320. doi:10.1017/S1461145706007437. PMID 17176492.

External links[edit]

Wikimedia Commons has media related to Serotonin.

  • 5-Hydroxytryptamine MS Spectrum
  • Serotonin bound to proteins in the PDB
  • PsychoTropicalResearch Extensive reviews on serotonergic drugs and Serotonin Syndrome.
  • Molecule of the Month: Serotonin at University of Bristol
  • 60-Second Psych: No Fair! My Serotonin Level Is Low, Scientific American
  • Serotonin Test Interpretation on ClinLab Navigator.
Источник
Serotonin

Skeletal formula of serotonin
Clinical data
Other names 5-HT, 5-Hydroxytryptamine, Enteramine, Thrombocytin, 3-(β-Aminoethyl)-5-hydroxyindole, Thrombotonin
Physiological data
Source tissues raphe nuclei, enterochromaffin cells
Target tissues system-wide
Receptors 5-HT1, 5-HT2, 5-HT3, 5-HT4, 5-HT5, 5-HT6, 5-HT7
Agonists Indirectly: SSRIs, MAOIs
Precursor 5-HTP
Biosynthesis Aromatic L-amino acid decarboxylase
Metabolism MAO
Identifiers

IUPAC name

  • 3-(2-Aminoethyl)-1H-indol-5-ol
CAS Number
  • 50-67-9
PubChem CID
  • 5202
IUPHAR/BPS
  • 5
ChemSpider
  • 5013
KEGG
  • C00780
PDB ligand
  • SRO (PDBe, RCSB PDB)
CompTox Dashboard (EPA)
  • DTXSID8075330 Edit this at Wikidata
ECHA InfoCard 100.000.054 Edit this at Wikidata
Serotonin

Ball-and-stick model of the serotonin molecule
Names
IUPAC name

5-Hydroxytryptamine
Preferred IUPAC name

3-(2-Aminoethyl)-1H-indol-5-ol
Other names

5-Hydroxytryptamine, 5-HT, Enteramine; Thrombocytin, 3-(β-Aminoethyl)-5-hydroxyindole, 3-(2-Aminoethyl)indol-5-ol, Thrombotonin
Identifiers

CAS Number
  • 50-67-9 check

3D model (JSmol)
  • Interactive image
ChEBI
  • CHEBI:28790 check
ChEMBL
  • ChEMBL39 check
ChemSpider
  • 5013 check
ECHA InfoCard 100.000.054 Edit this at Wikidata

IUPHAR/BPS
  • 5
KEGG
  • C00780 check
MeSH Serotonin

PubChem CID
  • 5202
UNII
  • 333DO1RDJY check

CompTox Dashboard (EPA)
  • DTXSID8075330 Edit this at Wikidata

InChI

  • InChI=1S/C10H12N2O/c11-4-3-7-6-12-10-2-1-8(13)5-9(7)10/h1-2,5-6,12-13H,3-4,11H2 check

    Key: QZAYGJVTTNCVMB-UHFFFAOYSA-N check

  • InChI=1/C10H12N2O/c11-4-3-7-6-12-10-2-1-8(13)5-9(7)10/h1-2,5-6,12-13H,3-4,11H2

    Key: QZAYGJVTTNCVMB-UHFFFAOYAX

SMILES

  • C1=CC2=C(C=C1O)C(=CN2)CCN
Properties

Chemical formula

 C10H12N2O
Molar mass 176.215 g/mol
Appearance White powder
Melting point 167.7 °C (333.9 °F; 440.8 K) 121–122 °C (ligroin)[3]
Boiling point 416 ± 30 °C (at 760 Torr)[1]

Solubility in water

 slightly soluble
Acidity (pKa) 10.16 in water at 23.5 °C[2]

Dipole moment

 2.98 D
Hazards
Lethal dose or concentration (LD, LC):

LD50 (median dose)

 750 mg/kg (subcutaneous, rat),[4] 4500 mg/kg (intraperitoneal, rat),[5] 60 mg/kg (oral, rat)
Safety data sheet (SDS) External MSDS

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

check verify (what is check☒ ?)

Infobox references

Serotonin ([6][7][8]) or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter. Its biological function is complex and multifaceted, modulating mood, cognition, reward, learning, memory, and numerous physiological processes such as vomiting and vasoconstriction.[9] Approximately 90% of the serotonin that the body produces is in the intestinal tract.[10]

Biochemically, the indoleamine molecule derives from the amino acid tryptophan, via the (rate-limiting) hydroxylation of the 5 position on the ring (forming the intermediate 5-hydroxytryptophan), and then decarboxylation to produce serotonin.[11] Serotonin is primarily found in the enteric nervous system located in the gastrointestinal tract (GI tract). However, it is also produced in the central nervous system (CNS), specifically in the raphe nuclei located in the brainstem, Merkel cells located in the skin, pulmonary neuroendocrine cells and taste receptor cells in the tongue. Additionally, serotonin is stored in blood platelets and is released during agitation and vasoconstriction, where it then acts as an agonist to other platelets.[12]

Approximately 90% of the human body’s total serotonin is located in the enterochromaffin cells in the GI tract, where it regulates intestinal movements.[13][14] About 8% is found in platelets and 1–2% in the CNS.[15] The serotonin is secreted luminally and basolaterally, which leads to increased serotonin uptake by circulating platelets and activation after stimulation, which gives increased stimulation of myenteric neurons and gastrointestinal motility.[16] The remainder is synthesized in serotonergic neurons of the CNS, where it has various functions. These include the regulation of mood, appetite, and sleep. Serotonin also has some cognitive functions, including memory and learning.

Several classes of antidepressants, such as the SSRIs and the SNRIs among others, interfere with the normal reabsorption of serotonin after it is done with the transmission of the signal, therefore augmenting the neurotransmitter levels in the synapses.

Serotonin secreted from the enterochromaffin cells eventually finds its way out of tissues into the blood. There, it is actively taken up by blood platelets, which store it. When the platelets bind to a clot, they release serotonin, where it can serve as a vasoconstrictor or a vasodilator while regulating hemostasis and blood clotting. In high concentrations, serotonin acts as a vasoconstrictor by contracting endothelial smooth muscle directly or by potentiating the effects of other vasoconstrictors (e.g. angiotensin II, norepinephrine). The vasoconstrictive property is mostly seen in pathologic states affecting the endothelium – such as atherosclerosis or chronic hypertension. In physiologic states, vasodilation occurs through the serotonin mediated release of nitric oxide from endothelial cells. Additionally, it inhibits the release of norepinephrine from adrenergic nerves.[17] Serotonin is also a growth factor for some types of cells, which may give it a role in wound healing. There are various serotonin receptors.

Serotonin is metabolized mainly to 5-HIAA, chiefly by the liver. Metabolism involves first oxidation by monoamine oxidase to the corresponding aldehyde. The rate-limiting step is hydride transfer from serotonin to the flavin cofactor.[18] There follows oxidation by aldehyde dehydrogenase to 5-HIAA, the indole acetic-acid derivative. The latter is then excreted by the kidneys.

Besides mammals, serotonin is found in all bilateral animals including worms and insects,[19] as well as in fungi and in plants.[20] Serotonin’s presence in insect venoms and plant spines serves to cause pain, which is a side-effect of serotonin injection.[21][22] Serotonin is produced by pathogenic amoebae, and its effect in the human gut is diarrhea.[23] Its widespread presence in many seeds and fruits may serve to stimulate the digestive tract into expelling the seeds.[24]

Biological role[edit]

Serotonin is involved in numerous physiological processes, including sleep, thermoregulation, learning and memory, pain, (social) behavior,[25] sexual activity, feeding, motor activity, biological rhythms and possibly others.[26] In less complex animals, such as some invertebrates, serotonin regulates feeding and other processes.[27] In plants serotonin synthesis seems to be associated with stress signals.[20][28]

Cellular effects[edit]

Serotonin primarily acts through its receptors and its effects depend on which cells and tissues express these receptors (see below).[26]

Receptors[edit]

The 5-HT receptors, the receptors for serotonin, are located on the cell membrane of nerve cells and other cell types in animals, and mediate the effects of serotonin as the endogenous ligand and of a broad range of pharmaceutical and psychedelic drugs. Except for the 5-HT3 receptor, a ligand-gated ion channel, all other 5-HT receptors are G-protein-coupled receptors (also called seven-transmembrane, or heptahelical receptors) that activate an intracellular second messenger cascade.[29]

Termination[edit]

Serotonergic action is terminated primarily via uptake of 5-HT from the synapse. This is accomplished through the specific monoamine transporter for 5-HT, SERT, on the presynaptic neuron. Various agents can inhibit 5-HT reuptake, including cocaine, dextromethorphan (an antitussive), tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRIs). A 2006 study conducted by the University of Washington suggested that a newly discovered monoamine transporter, known as PMAT, may account for «a significant percentage of 5-HT clearance».[30]

Contrasting with the high-affinity SERT, the PMAT has been identified as a low-affinity transporter, with an apparent Km of 114 micromoles/l for serotonin; approximately 230 times higher than that of SERT. However, the PMAT, despite its relatively low serotonergic affinity, has a considerably higher transport ‘capacity’ than SERT, «resulting in roughly comparable uptake efficiencies to SERT in heterologous expression systems.»[30] The study also suggests some SSRIs, such as fluoxetine and sertraline anti-depressants, inhibit PMAT but at IC50 values which surpass the therapeutic plasma concentrations by up to four orders of magnitude. Therefore, SSRI monotherapy is «ineffective» in PMAT inhibition. At present, no known pharmaceuticals are known to appreciably inhibit PMAT at normal therapeutic doses. The PMAT also suggestively transports dopamine and norepinephrine, albeit at Km values even higher than that of 5-HT (330–15,000 μmoles/L).[30]

Serotonylation[edit]

Serotonin can also signal through a nonreceptor mechanism called serotonylation, in which serotonin modifies proteins.[31] This process underlies serotonin’s effects upon platelet-forming cells (thrombocytes) in which it links to the modification of signaling enzymes called GTPases that then trigger the release of vesicle contents by exocytosis.[32] A similar process underlies the pancreatic release of insulin.[31]

The effects of serotonin upon vascular smooth muscle tone – the biological function after which serotonin was originally named – depend upon the serotonylation of proteins involved in the contractile apparatus of muscle cells.[33]

Binding profile of serotonin

Receptor Ki (nM)[34] Receptor function[Note 1]
5-HT1 receptor family signals via Gi/o inhibition of adenylyl cyclase.
5-HT1A 3.17 Memory[vague] (agonists ↓); learning[vague] (agonists ↓); anxiety (agonists ↓); depression (agonists ↓); positive, negative, and cognitive symptoms of schizophrenia (partial agonists ↓); analgesia (agonists ↑); aggression (agonists ↓); dopamine release in the prefrontal cortex (agonists ↑); serotonin release and synthesis (agonists ↓)
5-HT1B 4.32 Vasoconstriction (agonists ↑); aggression (agonists ↓); bone mass (↓). Serotonin autoreceptor.
5-HT1D 5.03 Vasoconstriction (agonists ↑)
5-HT1E 7.53
5-HT1F 10
5-HT2 receptor family signals via Gq activation of phospholipase C.
5-HT2A 11.55 Psychedelia (agonists ↑); depression (agonists & antagonists ↓); anxiety (antagonists ↓); positive and negative symptoms of schizophrenia (antagonists ↓); norepinephrine release from the locus coeruleus (antagonists ↑); glutamate release in the prefrontal cortex (agonists ↑); dopamine in the prefrontal cortex (agonists ↑);[35] urinary bladder contractions (agonists ↑)[36]
5-HT2B 8.71 Cardiovascular functioning (agonists increase risk of pulmonary hypertension), empathy (via von Economo neurons[37])
5-HT2C 5.02 Dopamine release into the mesocorticolimbic pathway (agonists ↓); acetylcholine release in the prefrontal cortex (agonists ↑); dopaminergic and noradrenergic activity in the frontal cortex (antagonists ↑);[38] appetite (agonists ↓); antipsychotic effects (agonists ↑); antidepressant effects (agonists & antagonists ↑)
Other 5-HT receptors
5-HT3 593 Emesis (agonists ↑); anxiolysis (antagonists ↑).
5-HT4 125.89 Movement of food across the GI tract (agonists ↑); memory & learning (agonists ↑); antidepressant effects (agonists ↑). Signalling via Gαs activation of adenylyl cyclase.
5-HT5A 251.2 Memory consolidation.[39] Signals via Gi/o inhibition of adenylyl cyclase.
5-HT6 98.41 Cognition (antagonists ↑); antidepressant effects (agonists & antagonists ↑); anxiogenic effects (antagonists ↑[40]). Gs signalling via activating adenylyl cyclase.
5-HT7 8.11 Cognition (antagonists ↑); antidepressant effects (antagonists ↑). Acts by Gs signalling via activating adenylyl cyclase.

Nervous system[edit]

In this drawing of the brain, the serotonergic system is red and the mesolimbic dopamine pathway is blue. There is one collection of serotonergic neurons in the upper brainstem that sends axons upwards to the whole cerebrum, and one collection next to the cerebellum that sends axons downward to the spinal cord. Slightly forward the upper serotonergic neurons is the ventral tegmental area (VTA), which contains dopaminergic neurons. These neurons' axons then connect to the nucleus accumbens, hippocampus, and the frontal cortex. Over the VTA is another collection of dopaminergic cells, the substansia nigra, which send axons to the striatum.

The neurons of the raphe nuclei are the principal source of 5-HT release in the brain.[41] There are nine raphe nuclei, designated B1–B9, which contain the majority of serotonin-containing neurons (some scientists chose to group the nuclei raphes lineares into one nucleus), all of which are located along the midline of the brainstem, and centered on the reticular formation.[42][43] Axons from the neurons of the raphe nuclei form a neurotransmitter system reaching almost every part of the central nervous system. Axons of neurons in the lower raphe nuclei terminate in the cerebellum and spinal cord, while the axons of the higher nuclei spread out in the entire brain.

Ultrastructure and function[edit]

The serotonin nuclei may also be divided into two main groups, the rostral and caudal containing three and four nuclei respectively. The rostral group consists of the caudal linear nuclei (B8), the dorsal raphe nuclei (B6 and B7) and the median raphe nuclei (B5, B8 and B9), that project into multiple cortical and subcortical structures. The caudal group consists of the nucleus raphe magnus (B3), raphe obscurus nucleus (B2), raphe pallidus nucleus (B1), and lateral medullary reticular formation, that project into the brainstem.[44]

The serotonergic pathway is involved in sensorimotor function, with pathways projecting both into cortical (Dorsal and Median Raphe Nuclei), subcortical, and spinal areas involved in motor activity. Pharmacological manipulation suggests that serotonergic activity increases with motor activity while firing rates of serotonergic neurons increase with intense visual stimuli. Animal models suggest that kainate signaling negatively regulates serotonin actions in the retina, with possible implications for the control of the visual system.[45] The descending projections form a pathway that inhibits pain called the «descending inhibitory pathway» that may be relevant to a disorder such as fibromyalgia, migraine, and other pain disorders, and the efficacy of antidepressants in them.[46]

Serotonergic projections from the caudal nuclei are involved in regulating mood and emotion, and hypo-[47] or hyper-serotonergic[48] states may be involved in depression and sickness behavior.

Microanatomy[edit]

Serotonin is released into the synapse, or space between neurons, and diffuses over a relatively wide gap (>20 nm) to activate 5-HT receptors located on the dendrites, cell bodies, and presynaptic terminals of adjacent neurons.

When humans smell food, dopamine is released to increase the appetite. But, unlike in worms, serotonin does not increase anticipatory behaviour in humans; instead, the serotonin released while consuming activates 5-HT2C receptors on dopamine-producing cells. This halts their dopamine release, and thereby serotonin decreases appetite. Drugs that block 5-HT2C receptors make the body unable to recognize when it is no longer hungry or otherwise in need of nutrients, and are associated with weight gain,[49] especially in people with a low number of receptors.[50] The expression of 5-HT2C receptors in the hippocampus follows a diurnal rhythm,[51] just as the serotonin release in the ventromedial nucleus, which is characterised by a peak at morning when the motivation to eat is strongest.[52]

In macaques, alpha males have twice the level of serotonin in the brain as subordinate males and females (measured by the concentration of 5-HIAA in the cerebrospinal fluid (CSF)). Dominance status and CSF serotonin levels appear to be positively correlated. When dominant males were removed from such groups, subordinate males begin competing for dominance. Once new dominance hierarchies were established, serotonin levels of the new dominant individuals also increased to double those in subordinate males and females. The reason why serotonin levels are only high in dominant males, but not dominant females has not yet been established.[53]

In humans, levels of 5-HT1A receptor inhibition in the brain show negative correlation with aggression,[54] and a mutation in the gene that codes for the 5-HT2A receptor may double the risk of suicide for those with that genotype.[55] Serotonin in the brain is not usually degraded after use, but is collected by serotonergic neurons by serotonin transporters on their cell surfaces. Studies have revealed nearly 10% of total variance in anxiety-related personality depends on variations in the description of where, when and how many serotonin transporters the neurons should deploy.[56]

Psychological influences[edit]

Serotonin has been implicated in cognition, mood, anxiety and psychosis, but strong clarity has not been achieved.[57][58]

Autism spectrum disorder (ASD)[edit]

In regards to research for neurotransmitters and effects on patients with Autism Spectrum Disorder (ASD), 5-HT has been studied the most in terms of research efforts and investigations.[59] As noted, 5-HT signaling does facilitate many neural processes including that of neurogenesis, cell migration and survival, synaptogenesis, and synaptic plasticity.[59] It was noted that 45% of tested ASD subjects contained high levels of 5-HT in their blood.[59] In addition, investigations performed on ASD-like animal models reported that hyperserotonemia significantly reduced the motivation for social interest through inhibition of separation distress, which could be related in the ASD patients that have social impairments.[59]

Outside the nervous system[edit]

In the digestive tract (emetic)[edit]

Serotonin regulates gastrointestinal function. The gut is surrounded by enterochromaffin cells, which release serotonin in response to food in the lumen. This makes the gut contract around the food. Platelets in the veins draining the gut collect excess serotonin. There are often serotonin abnormalities in gastrointestinal disorders such as constipation and irritable bowel syndrome.[60]

If irritants are present in the food, the enterochromaffin cells release more serotonin to make the gut move faster, i.e., to cause diarrhea, so the gut is emptied of the noxious substance. If serotonin is released in the blood faster than the platelets can absorb it, the level of free serotonin in the blood is increased. This activates 5-HT3 receptors in the chemoreceptor trigger zone that stimulate vomiting.[61] Thus, drugs and toxins stimulate serotonin release from enterochromaffin cells in the gut wall. The enterochromaffin cells not only react to bad food but are also very sensitive to irradiation and cancer chemotherapy. Drugs that block 5HT3 are very effective in controlling the nausea and vomiting produced by cancer treatment, and are considered the gold standard for this purpose.[62]

Bone metabolism[edit]

In mice and humans, alterations in serotonin levels and signalling have been shown to regulate bone mass.[63][64][65][66] Mice that lack brain serotonin have osteopenia, while mice that lack gut serotonin have high bone density. In humans, increased blood serotonin levels have been shown to be significant negative predictor of low bone density. Serotonin can also be synthesized, albeit at very low levels, in the bone cells. It mediates its actions on bone cells using three different receptors. Through 5-HT1B receptors, it negatively regulates bone mass, while it does so positively through 5-HT2B receptors and 5-HT2C receptors. There is very delicate balance between physiological role of gut serotonin and its pathology. Increase in the extracellular content of serotonin results in a complex relay of signals in the osteoblasts culminating in FoxO1/ Creb and ATF4 dependent transcriptional events.[67] Following the 2008 findings that gut serotonin regulates bone mass, the mechanistic investigations into what regulates serotonin synthesis from the gut in the regulation of bone mass have started. Piezo1 has been shown to sense RNA in the gut and relay this information through serotonin synthesis to the bone by acting as a sensor of single-stranded RNA (ssRNA) governing 5-HT production. Intestinal epithelium-specific deletion of mouse Piezo1 profoundly disturbed gut peristalsis, impeded experimental colitis, and suppressed serum 5-HT levels. Because of systemic 5-HT deficiency, conditional knockout of Piezo1 increased bone formation. Notably, fecal ssRNA was identified as a natural Piezo1 ligand, and ssRNA-stimulated 5-HT synthesis from the gut was evoked in a MyD88/TRIF-independent manner. Colonic infusion of RNase A suppressed gut motility and increased bone mass. These findings suggest gut ssRNA as a master determinant of systemic 5-HT levels, indicating the ssRNA-Piezo1 axis as a potential prophylactic target for treatment of bone and gut disorders. Studies in 2008, 2010 and 2019 have opened the potential for serotonin research to treat bone mass disorders.[68][69]

Organ development[edit]

Since serotonin signals resource availability it is not surprising that it affects organ development. Many human and animal studies have shown that nutrition in early life can influence, in adulthood, such things as body fatness, blood lipids, blood pressure, atherosclerosis, behavior, learning, and longevity.[70][71][72] Rodent experiment shows that neonatal exposure to SSRIs makes persistent changes in the serotonergic transmission of the brain resulting in behavioral changes,[73][74] which are reversed by treatment with antidepressants.[75] By treating normal and knockout mice lacking the serotonin transporter with fluoxetine scientists showed that normal emotional reactions in adulthood, like a short latency to escape foot shocks and inclination to explore new environments were dependent on active serotonin transporters during the neonatal period.[76][77]

Human serotonin can also act as a growth factor directly. Liver damage increases cellular expression of 5-HT2A and 5-HT2B receptors, mediating liver compensatory regrowth (see Liver § Regeneration and transplantation)[78] Serotonin present in the blood then stimulates cellular growth to repair liver damage.[79]
5HT2B receptors also activate osteocytes, which build up bone[80] However, serotonin also inhibits osteoblasts, through 5-HT1B receptors.[81]

Cardiovascular growth factor[edit]

Serotonin, in addition, evokes endothelial nitric oxide synthase activation and stimulates, through a 5-HT1B receptor-mediated mechanism, the phosphorylation of p44/p42 mitogen-activated protein kinase activation in bovine aortic endothelial cell cultures.[clarification needed][82] In blood, serotonin is collected from plasma by platelets, which store it. It is thus active wherever platelets bind in damaged tissue, as a vasoconstrictor to stop bleeding, and also as a fibrocyte mitotic (growth factor), to aid healing.[83]

Skin[edit]

Serotonin is also produced by Merkel cells which are part of the somatosensory system.[84]

Lungs[edit]

Pulmonary neuroendocrine cells are specialized epithelial cells that occur as solitary cells or as clusters called neuroepithelial bodies in the lung. Pulmonary neuroendocrine cells are also known as Kulchitsky cells or K cells.[85]

Pharmacology[edit]

Several classes of drugs target the 5-HT system, including some antidepressants, antipsychotics, anxiolytics, antiemetics, and antimigraine drugs, as well as, the psychedelic drugs and empathogens.

Mechanism of action[edit]

At rest, serotonin is stored within the vesicles of presynaptic neurons. When stimulated by nerve impulses, serotonin is released as a neurotransmitter into the synapse, reversibly binding to the postsynaptic receptor to induce a nerve impulse on the postsynaptic neuron. Serotonin can also bind to auto-receptors on the presynaptic neuron to regulate the synthesis and release of serotonin. Normally serotonin is taken back into the presynaptic neuron to stop its action, then reused or broken down by monoamine oxidase.[86]

Psychedelic drugs[edit]

The serotonergic psychedelic drugs psilocin/psilocybin, DMT, mescaline, psychedelic mushroom and LSD are agonists, primarily at 5HT2A/2C receptors.[87][88][89] The empathogen-entactogen MDMA releases serotonin from synaptic vesicles of neurons.[90]

Antidepressants[edit]

Drugs that alter serotonin levels are used in treating depression, generalized anxiety disorder, and social phobia. Monoamine oxidase inhibitors (MAOIs) prevent the breakdown of monoamine neurotransmitters (including serotonin), and therefore increase concentrations of the neurotransmitter in the brain. MAOI therapy is associated with many adverse drug reactions, and patients are at risk of hypertensive emergency triggered by foods with high tyramine content, and certain drugs. Some drugs inhibit the re-uptake of serotonin, making it stay in the synaptic cleft longer. The tricyclic antidepressants (TCAs) inhibit the reuptake of both serotonin and norepinephrine. The newer selective serotonin reuptake inhibitors (SSRIs) have fewer side-effects and fewer interactions with other drugs.[91]

Certain SSRI medications have been shown to lower serotonin levels below the baseline after chronic use, despite initial increases.[92] The 5-HTTLPR gene codes for the number of serotonin transporters in the brain, with more serotonin transporters causing decreased duration and magnitude of serotonergic signaling.[93] The 5-HTTLPR polymorphism (l/l) causing more serotonin transporters to be formed is also found to be more resilient against depression and anxiety.[94][95]

Serotonin syndrome[edit]

Extremely high levels of serotonin can cause a condition known as serotonin syndrome, with toxic and potentially fatal effects. In practice, such toxic levels are essentially impossible to reach through an overdose of a single antidepressant drug, but require a combination of serotonergic agents, such as an SSRI with a MAOI, which may occur in therapeutic doses.[96][97] The intensity of the symptoms of serotonin syndrome vary over a wide spectrum, and the milder forms are seen even at nontoxic levels.[98] It is estimated that 14% of patients experiencing serotonin syndrome overdose on SSRIs; meanwhile the fatality rate is between 2% to 12%.[96][99][100]

Antiemetics[edit]

Some 5-HT3 antagonists, such as ondansetron, granisetron, and tropisetron, are important antiemetic agents. They are particularly important in treating the nausea and vomiting that occur during anticancer chemotherapy using cytotoxic drugs. Another application is in the treatment of postoperative nausea and vomiting.

Other[edit]

Some serotonergic agonist drugs cause fibrosis anywhere in the body, particularly the syndrome of retroperitoneal fibrosis, as well as cardiac valve fibrosis.[101]
In the past, three groups of serotonergic drugs have been epidemiologically linked with these syndromes. These are the serotonergic vasoconstrictive antimigraine drugs (ergotamine and methysergide),[101] the serotonergic appetite suppressant drugs (fenfluramine, chlorphentermine, and aminorex), and certain anti-Parkinsonian dopaminergic agonists, which also stimulate serotonergic 5-HT2B receptors. These include pergolide and cabergoline, but not the more dopamine-specific lisuride.[102]

As with fenfluramine, some of these drugs have been withdrawn from the market after groups taking them showed a statistical increase of one or more of the side effects described. An example is pergolide. The drug was declining in use since it was reported in 2003 to be associated with cardiac fibrosis.[103]

Two independent studies published in The New England Journal of Medicine in January 2007 implicated pergolide, along with cabergoline, in causing valvular heart disease.[104][105] As a result of this, the FDA removed pergolide from the United States market in March 2007.[106] (Since cabergoline is not approved in the United States for Parkinson’s Disease, but for hyperprolactinemia, the drug remains on the market. Treatment for hyperprolactinemia requires lower doses than that for Parkinson’s Disease, diminishing the risk of valvular heart disease).[107]

Methyl-tryptamines and hallucinogens[edit]

For details on tryptamine neurotransmitters in humans, see Trace amine.

Several plants contain serotonin together with a family of related tryptamines that are methylated at the amino (NH2) and (OH) groups, are N-oxides, or miss the OH group. These compounds do reach the brain, although some portion of them are metabolized by monoamine oxidase enzymes (mainly MAO-A) in the liver. Examples are plants from the genus Anadenanthera that are used in the hallucinogenic yopo snuff. These compounds are widely present in the leaves of many plants, and may serve as deterrents for animal ingestion. Serotonin occurs in several mushrooms of the genus Panaeolus.[108]

Comparative biology and evolution[edit]

Unicellular organisms[edit]

Serotonin is used by a variety of single-cell organisms for various purposes. SSRIs have been found to be toxic to algae.[109] The gastrointestinal parasite Entamoeba histolytica secretes serotonin, causing a sustained secretory diarrhea in some people.[23][110] Patients infected with E. histolytica have been found to have highly elevated serum serotonin levels, which returned to normal following resolution of the infection.[111] E. histolytica also responds to the presence of serotonin by becoming more virulent.[112] This means serotonin secretion not only serves to increase the spread of enteamoebas by giving the host diarrhea but also serves to coordinate their behaviour according to their population density, a phenomenon known as quorum sensing. Outside the gut of a host, there is nothing that the entoamoebas provoke to release serotonin, hence the serotonin concentration is very low. Low serotonin signals to the entoamoebas they are outside a host and they become less virulent to conserve energy. When they enter a new host, they multiply in the gut, and become more virulent as the enterochromaffine cells get provoked by them and the serotonin concentration increases.

Edible plants and mushrooms[edit]

In drying seeds, serotonin production is a way to get rid of the buildup of poisonous ammonia. The ammonia is collected and placed in the indole part of L-tryptophan, which is then decarboxylated by tryptophan decarboxylase to give tryptamine, which is then hydroxylated by a cytochrome P450 monooxygenase, yielding serotonin.[113]

However, since serotonin is a major gastrointestinal tract modulator, it may be produced in the fruits of plants as a way of speeding the passage of seeds through the digestive tract, in the same way as many well-known seed and fruit associated laxatives. Serotonin is found in mushrooms, fruits, and vegetables. The highest values of 25–400 mg/kg have been found in nuts of the walnut (Juglans) and hickory (Carya) genera. Serotonin concentrations of 3–30 mg/kg have been found in plantains, pineapples, banana, kiwifruit, plums, and tomatoes. Moderate levels from 0.1–3 mg/kg have been found in a wide range of tested vegetables.[24][20]

Serotonin is one compound of the poison contained in stinging nettles (Urtica dioica), where it causes pain on injection in the same manner as its presence in insect venoms (see below).[22] It is also naturally found in Paramuricea clavata, or the Red Sea Fan.[114]

Serotonin and tryptophan have been found in chocolate with varying cocoa contents. The highest serotonin content (2.93 µg/g) was found in chocolate with 85% cocoa, and the highest tryptophan content (13.27–13.34 µg/g) was found in 70–85% cocoa. The intermediate in the synthesis from tryptophan to serotonin, 5-hydroxytryptophan, was not found.[115]

Root development in Arabidopsis thaliana is stimulated and modulated by serotonin — in various ways at various concentrations.[116]

Serotonin serves as a plant defense chemical against fungi. When infected with Fusarium crown rot (Fusarium pseudograminearum), wheat (Triticum aestivum) greatly increases its production of tryptophan to synthesize new serotonin.[117] The function of this is poorly understood[117] but wheat also produces serotonin when infected by Stagonospora nodorum — in that case to retard spore production.[118] The model cereal Brachypodium distachyon — used as a research substitute for wheat and other production cereals — also produces serotonin, coumaroyl-serotonin, and feruloyl-serotonin in response to F. graminearum. This produces a slight antimicrobial effect. B. distachyon produces more serotonin (and conjugates) in response to deoxynivalenol (DON)-producing F. graminearum than non-DON-producing.[119] Solanum lycopersicum produces many AA conjugates — including several of serotonin — in its leaves, stems, and roots in response to Ralstonia solanacearum infection.[120]

Invertebrates[edit]

Serotonin functions as a neurotransmitter in the nervous systems of most animals.

Nematodes[edit]

For example, in the roundworm Caenorhabditis elegans, which feeds on bacteria, serotonin is released as a signal in response to positive events, such as finding a new source of food or in male animals finding a female with which to mate.[121] When a well-fed worm feels bacteria on its cuticle, dopamine is released, which slows it down; if it is starved, serotonin also is released, which slows the animal down further. This mechanism increases the amount of time animals spend in the presence of food.[122] The released serotonin activates the muscles used for feeding, while octopamine suppresses them.[123][124] Serotonin diffuses to serotonin-sensitive neurons, which control the animal’s perception of nutrient availability.

Decapods[edit]

If lobsters are injected with serotonin, they behave like dominant individuals whereas octopamine causes subordinate behavior.[25] A crayfish that is frightened may flip its tail to flee, and the effect of serotonin on this behavior depends largely on the animal’s social status. Serotonin inhibits the fleeing reaction in subordinates, but enhances it in socially dominant or isolated individuals. The reason for this is social experience alters the proportion between serotonin receptors (5-HT receptors) that have opposing effects on the fight-or-flight response.[clarification needed] The effect of 5-HT1 receptors predominates in subordinate animals, while 5-HT2 receptors predominates in dominants.[125]

In venoms[edit]

Serotonin is a common component of invertebrate venoms, salivary glands, nervous tissues, and various other tissues, across molluscs, insects, crustaceans, scorpions, various kinds of worms, and jellyfish.[22] Adult Rhodnius prolixus — hematophagous on vertebrates — secrete lipocalins into the wound during feeding. In 2003 these lipocalins were demonstrated to sequester serotonin to prevent vasoconstriction (and possibly coagulation) in the host.[126]

Insects[edit]

Serotonin is evolutionarily conserved and appears across the animal kingdom. It is seen in insect processes in roles similar to in the human central nervous system, such as memory, appetite, sleep, and behavior.[127][19] Some circuits in mushroom bodies are serotonergic.[128] (See specific Drosophila example below, §Dipterans.)

Acrididae[edit]

Locust swarming is initiated but not maintained by serotonin,[129] with release being triggered by tactile contact between individuals.[130] This transforms social preference from aversion to a gregarious state that enables coherent groups.[131][130][129] Learning in flies and honeybees is affected by the presence of serotonin.[132][133]

Role in insecticides[edit]

Insect 5-HT receptors have similar sequences to the vertebrate versions, but pharmacological differences have been seen. Invertebrate drug response has been far less characterized than mammalian pharmacology and the potential for species selective insecticides has been discussed.[134]

Hymenopterans[edit]

Wasps and hornets have serotonin in their venom,[135] which causes pain and inflammation[21][22] as do scorpions.[136][22] Pheidole dentata takes on more and more tasks in the colony as it gets older, which requires it to respond to more and more olfactory cues in the course of performing them. This olfactory response broadening was demonstrated to go along with increased serotonin and dopamine, but not octopamine in 2006.[137]

Dipterans[edit]

If flies are fed serotonin, they are more aggressive; flies depleted of serotonin still exhibit aggression, but they do so much less frequently.[138] In their crops it plays a vital role in digestive motility produced by contraction. Serotonin that acts on the crop is exogenous to the crop itself and 2012 research suggested that it probably originated in the serotonin neural plexus in the thoracic-abdominal synganglion.[139] In 2011 a Drosophila serotonergic mushroom body was found to work in concert with Amnesiac to form memories.[128] In 2007 serotonin was found to promote aggression in Diptera, which was counteracted by neuropeptide F — a surprising find given that they both promote courtship, which is usually similar to aggression in most respects.[128]

Vertebrates[edit]

Serotonin, also referred to as 5-hydroxytryptamine (5-HT), is a neurotransmitter most known for its involvement in mood disorders in humans. It is also a widely present neuromodulator among vertebrates and invertebrates.[140] Serotonin has been found having associations with many physiological systems such as cardiovascular, thermoregulation, and behavioral functions, including: circadian rhythm, appetite, aggressive and sexual behavior, sensorimotor reactivity and learning, and pain sensitivity.[141] Serotonin’s function in neurological systems along with specific behaviors among vertebrates found to be strongly associated with serotonin will be further discussed. Two relevant case studies are also mentioned regarding serotonin development involving teleost fish and mice.

In mammals, 5-HT is highly concentrated in the substantia nigra, ventral tegmental area and raphe nuclei. Lesser concentrated areas include other brain regions and the spinal cord.[140] 5-HT neurons are also shown to be highly branched, indicating that they are structurally prominent for influencing multiple areas of the CNS at the same time, although this trend is exclusive solely to mammals.[141]

5-HT System in Vertebrates[edit]

Vertebrates are multicellular organisms in the phylum Chordata that possess a backbone and a nervous system. This includes mammals, fish, reptiles, birds, etc. In humans, the nervous system is composed of the central and peripheral nervous system, with little known about the specific mechanisms of neurotransmitters in most other vertebrates. However, it is known that while serotonin is involved in stress and behavioral responses, it is also important in cognitive functions.[140] Brain organization in most vertebrates includes 5-HT cells in the hindbrain.[140] In addition to this, 5-HT is often found in other sections of the brain in non-placental vertebrates, including the basal forebrain and pretectum.[142] Since location of serotonin receptors contribute to behavioral responses, this suggests serotonin is part of specific pathways in non-placental vertebrates that are not present in amniotic organisms.[143] Teleost fish and mice are organisms most often used to study the connection between serotonin and vertebrate behavior. Both organisms show similarities in the effect of serotonin on behavior, but differ in the mechanism in which the responses occur.

Dogs / Canine species[edit]

There are few studies of serotonin in dogs. One study reported serotonin values were higher at dawn than at dusk.[144] In another study, serum 5-HT levels did not seem to be associated with dogs’ behavioural response to a stressful situation.[145] Urinary serotonin/creatinine ratio in bitches tended to be higher 4 weeks after surgery. In addition, serotonin was positively correlated with both cortisol and progesterone but not with testosterone after ovariohysterectomy.[146]

Teleost Fish[edit]

Like non-placental vertebrates, teleost fish also possess 5-HT cells in other sections of the brain, including the basal forebrain.[142] Danio rerio (zebra fish) are a species of teleost fish often used for studying serotonin within the brain. Despite much being unknown about serotonergic systems in vertebrates, the importance in moderating stress and social interaction is known.[147] It is hypothesized that AVT and CRF cooperate with serotonin in the hypothalamic-pituitary-interrenal axis.[142] These neuropeptides influence the plasticity of the teleost, affecting its ability to change and respond to its environment. Subordinate fish in social settings show a drastic increase in 5-HT concentrations.[147] High levels of 5-HT long term influence the inhibition of aggression in subordinate fish.[147]

Mice[edit]

Researchers at the Department of Pharmacology and Medical Chemistry used serotonergic drugs on male mice to study the effects of selected drugs on their behavior.[148] Mice in isolation exhibit increased levels of agonistic behavior towards one another. Results found that serotonergic drugs reduce aggression in isolated mice while simultaneously increasing social interaction.[148] Each of the treatments use a different mechanism for targeting aggression, but ultimately all have the same outcome. While the study shows that serotonergic drugs successfully target serotonin receptors, it does not show specifics of the mechanisms that affect behavior, as all types of drugs tended to reduce aggression in isolated male mice.[148] Aggressive mice kept out of isolation may respond differently to changes in serotonin reuptake.

Behavior[edit]

Like in humans, serotonin is extremely involved in regulating behavior in most other vertebrates. This includes not only response and social behaviors, but also influencing mood. Defects in serotonin pathways can lead to intense variations in mood, as well as symptoms of mood disorders, which can be present in more than just humans.

[edit]

One of the most researched aspects of social interaction in which serotonin is involved is aggression. Aggression is regulated by the 5-HT system, as serotonin levels can both induce or inhibit aggressive behaviors, as seen in mice (see section on Mice) and crabs.[148] While this is widely accepted, it is unknown if serotonin interacts directly or indirectly with parts of the brain influencing aggression and other behaviors.[140] Studies of serotonin levels show that they drastically increase and decrease during social interactions, and they generally correlate with inhibiting or inciting aggressive behavior.[149] The exact mechanism of serotonin influencing social behaviors is unknown, as pathways in the 5-HT system in various vertebrates can differ greatly.[140]

Response to Stimuli[edit]

Serotonin is important in environmental response pathways, along with other neurotransmitters.[150] Specifically, it has been found to be involved in auditory processing in social settings, as primary sensory systems are connected to social interactions.[151] Serotonin is found in the IC structure of the midbrain, which processes specie specific and non-specific social interactions and vocalizations.[151] It also receives acoustic projections that convey signals to auditory processing regions.[151] Research has proposed that serotonin shapes the auditory information being received by the IC and therefore is influential in the responses to auditory stimuli.[151] This can influence how an organism responds to the sounds of predatory or other impactful species in their environment, as serotonin uptake can influence aggression and/or social interaction.

Mood[edit]

We can describe mood not as specific to an emotional status, but as associated with a relatively long-lasting emotional state. Serotonin’s association with mood is most known for various forms of depression and bipolar disorders in humans.[141] Disorders caused by serotonergic activity potentially contribute to the many symptoms of major depression, such as overall mood, activity, suicidal thoughts and sexual and cognitive dysfunction. Selective serotonin reuptake inhibitors (SSRI’s) are a class of drugs demonstrated to be an effective treatment in major depressive disorder and are the most prescribed class of antidepressants. SSRI’s function is to block the reuptake of serotonin, making more serotonin available to absorb by the receiving neuron. Animals have been studied for decades in order to understand depressive behavior among species. One of the most familiar studies, the forced swimming test (FST), was performed to measure potential antidepressant activity.[141] Rats were placed in an inescapable container of water, at which point time spent immobile and number of active behaviors (such as splashing or climbing) were compared before and after a panel of anti-depressant drugs were administered. Antidepressants that selectively inhibit NE reuptake were shown to reduce immobility and selectively increase climbing without affecting swimming. However, results of the SSRI’s also show reduced immobility but increased swimming without affecting climbing. This study demonstrated the importance of behavioral tests for antidepressants, as they can detect drugs with an effect on core behavior along with behavioral components of species.[141]

Growth and reproduction[edit]

In the nematode C. elegans, artificial depletion of serotonin or the increase of octopamine cues behavior typical of a low-food environment: C. elegans becomes more active, and mating and egg-laying are suppressed, while the opposite occurs if serotonin is increased or octopamine is decreased in this animal.[27] Serotonin is necessary for normal nematode male mating behavior,[152] and the inclination to leave food to search for a mate.[153] The serotonergic signaling used to adapt the worm’s behaviour to fast changes in the environment affects insulin-like signaling and the TGF beta signaling pathway,[154] which control long-term adaption.

In the fruit fly insulin both regulates blood sugar as well as acting as a growth factor. Thus, in the fruit fly, serotonergic neurons regulate the adult body size by affecting insulin secretion.[155][156] Serotonin has also been identified as the trigger for swarm behavior in locusts.[131] In humans, though insulin regulates blood sugar and IGF regulates growth, serotonin controls the release of both hormones, modulating insulin release from the beta cells in the pancreas through serotonylation of GTPase signaling proteins.[31] Exposure to SSRIs during pregnancy reduces fetal growth.[157]

Genetically altered C. elegans worms that lack serotonin have an increased reproductive lifespan, may become obese, and sometimes present with arrested development at a dormant larval state.[158][159]

Aging and age-related phenotypes[edit]

Serotonin is known to regulate aging, learning and memory. The first evidence comes from the study of longevity in C. elegans.[154] During early phase of aging[vague], the level of serotonin increases, which alters locomotory behaviors and associative memory.[160] The effect is restored by mutations and drugs (including mianserin and methiothepin) that inhibit serotonin receptors. The observation does not contradict with the notion that the serotonin level goes down in mammals and humans, which is typically seen in late but not early[vague] phase of aging.

Biochemical mechanisms[edit]

Biosynthesis[edit]

On top an L-tryptophan molecule with an arrow down to a 5-HTP molecule. Tryptophan hydroxylase catalyses this reaction with help of O2 and tetrahydrobiopterin, which becomes water and dihydrobiopterin. From the 5-HTP molecule goes an arrow down to a serotonin molecule. Aromatic L-amino acid decarboxylase or 5-Hydroxytryptophan decarboxylase catalyses this reaction with help of pyridoxal phosphate. From the serotonin molecule goes an arrow to a 5-HIAA molecule at the bottom ot the image. Monoamine oxidase catalyses this reaction, in the process O2 and water is consumed, and ammonia and hydrogen peroxide is produced.

The pathway for the synthesis of serotonin from tryptophan.

In animals including humans, serotonin is synthesized from the amino acid L-tryptophan by a short metabolic pathway consisting of two enzymes, tryptophan hydroxylase (TPH) and aromatic amino acid decarboxylase (DDC), and the coenzyme pyridoxal phosphate. The TPH-mediated reaction is the rate-limiting step in the pathway.
TPH has been shown to exist in two forms: TPH1, found in several tissues, and TPH2, which is a neuron-specific isoform.[161]

Serotonin can be synthesized from tryptophan in the lab using Aspergillus niger and Psilocybe coprophila as catalysts. The first phase to 5-hydroxytryptophan would require letting tryptophan sit in ethanol and water for 7 days, then mixing in enough HCl (or other acid) to bring the pH to 3, and then adding NaOH to make a pH of 13 for 1 hour. Asperigillus niger would be the catalyst for this first phase. The second phase to synthesizing tryptophan itself from the 5-hydroxytryptophan intermediate would require adding ethanol and water, and letting sit for 30 days this time. The next two steps would be the same as the first phase: adding HCl to make the pH = 3, and then adding NaOH to make the pH very basic at 13 for 1 hour. This phase uses the Psilocybe coprophila as the catalyst for the reaction.[162]

Serotonin taken orally does not pass into the serotonergic pathways of the central nervous system, because it does not cross the blood–brain barrier.[9] However, tryptophan and its metabolite 5-hydroxytryptophan (5-HTP), from which serotonin is synthesized, do cross the blood–brain barrier. These agents are available as dietary supplements and in various foods, and may be effective serotonergic agents.
One product of serotonin breakdown is 5-hydroxyindoleacetic acid (5-HIAA), which is excreted in the urine. Serotonin and 5-HIAA are sometimes produced in excess amounts by certain tumors or cancers, and levels of these substances may be measured in the urine to test for these tumors.

Analytical chemistry[edit]

Indium tin oxide is recommended for the electrode material in electrochemical investigation of concentrations produced, detected, or consumed by microbes.[163] A mass spectrometry technique was developed in 1994 to measure the molecular weight of both natural and synthetic serotonins.[164]

History and etymology[edit]

It had been known to physiologists for over a century that a vasoconstrictor material appears in serum when blood was allowed to clot.[165] In 1935, Italian Vittorio Erspamer showed an extract from enterochromaffin cells made intestines contract. Some believed it contained adrenaline, but two years later, Erspamer was able to show it was a previously unknown amine, which he named «enteramine».[166][167] In 1948, Maurice M. Rapport, Arda Green, and Irvine Page of the Cleveland Clinic discovered a vasoconstrictor substance in blood serum, and since it was a serum agent affecting vascular tone, they named it serotonin.[168]

In 1952, enteramine was shown to be the same substance as serotonin, and as the broad range of physiological roles was elucidated, the abbreviation 5-HT of the proper chemical name 5-hydroxytryptamine became the preferred name in the pharmacological field.[169] Synonyms of serotonin include: 5-hydroxytriptamine, thrombotin, enteramin, substance DS, and 3-(β-Aminoethyl)-5-hydroxyindole.[170] In 1953, Betty Twarog and Page discovered serotonin in the central nervous system.[171] Page regarded Erspamer’s work on Octopus vulgaris, Discoglossus pictus, Hexaplex trunculus, Bolinus brandaris, Sepia, Mytilus, and Ostrea as valid and fundamental to understanding this newly identified substance, but regarded his earlier results in various models — especially those from rat blood — to be too confounded by the presence of other MAs, including some other vasoactives.[172]

See also[edit]

  • HIOC

Notes[edit]

  1. ^ References for the functions of these receptors are available on the wikipedia pages for the specific receptor in question

References[edit]

  1. ^ Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994–2011 ACD/Labs)
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  3. ^ Pietra S (1958). «[Indolic derivatives. II. A new way to synthesize serotonin]». Il Farmaco; Edizione Scientifica (in Italian). 13 (1): 75–79. PMID 13524273.
  4. ^ Erspamer V (1952). «Ricerche preliminari sulle indolalchilamine e sulle fenilalchilamine degli estratti di pelle di Anfibio». Ricerca Scientifica. 22: 694–702.
  5. ^ Tammisto T (1967). «Increased toxicity of 5-hydroxytryptamine by ethanol in rats and mice». Annales Medicinae Experimentalis et Biologiae Fenniae. 46 (3): 382–384. PMID 5734241.
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  8. ^ «Serotonin». Merriam-Webster Dictionary.
  9. ^ a b Young SN (November 2007). «How to increase serotonin in the human brain without drugs». Journal of Psychiatry & Neuroscience. 32 (6): 394–399. PMC 2077351. PMID 18043762.
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Further reading[edit]

  • Gutknecht L, Jacob C, Strobel A, Kriegebaum C, Müller J, Zeng Y, et al. (June 2007). «Tryptophan hydroxylase-2 gene variation influences personality traits and disorders related to emotional dysregulation». The International Journal of Neuropsychopharmacology. 10 (3): 309–320. doi:10.1017/S1461145706007437. PMID 17176492.

External links[edit]

Wikimedia Commons has media related to Serotonin.

  • 5-Hydroxytryptamine MS Spectrum
  • Serotonin bound to proteins in the PDB
  • PsychoTropicalResearch Extensive reviews on serotonergic drugs and Serotonin Syndrome.
  • Molecule of the Month: Serotonin at University of Bristol
  • 60-Second Psych: No Fair! My Serotonin Level Is Low, Scientific American
  • Serotonin Test Interpretation on ClinLab Navigator.
Источник

Серотонин
(Serotoninum)

Содержание

  • Структурная формула
  • Русское название
  • Английское название
  • Латинское название вещества Серотонин
  • Химическое название
  • Брутто формула
  • Фармакологическая группа вещества Серотонин
  • Нозологическая классификация
  • Код CAS
  • Торговые названия с действующим веществом Серотонин

Структурная формула

Структурная формула Серотонин

Русское название

Серотонин

Английское название

Serotonin

Латинское название вещества Серотонин

Serotoninum (род. Serotonini)

Химическое название

5-Окситриптамин (и в виде адипината)

Фармакологическая группа вещества Серотонин

Торговые названия с действующим веществом Серотонин


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Источник

Серотонин: гормон хорошего настроения

Рассказываем, почему он так важен для нашего организма и какая пища активизирует его выработку.

Серотонин – химическое вещество, которое обеспечивает передачу сигналов между нервными клетками. Он присутствует в головном мозге, клетках крови (тромбоцитах) и кишечнике. Серотонин регулирует моторику гладких мышечных волокон. То есть именно благодаря ему сокращается, например, ЖКТ или матка при родах.

Серотонин в головном мозге выполняет успокаивающую функцию. У нас в организме все время соблюдается определенный баланс между бодрствованием и сном, результатом которого является наше общее состояние. Так вот серотонин «играет» на стороне сна.

Еще одна важная функция – контроль уровня болевой чувствительности. Мы все по-разному переносим боль. Люди, которым это удается легче, обладают активной серотониновой системой.

Кроме того, важная задача серотонина – помогать нам сосредоточиться на главном. В мозгу постоянно идет огромное количество сенсорных, эмоциональных и информационных потоков, и серотонин отсекает лишнее. Если ему мешать, начнется путаница.

И конечно, серотонин играет важную роль в поддержании эмоционального состояния: он подавляет отрицательные эмоции и не дает нам уходить в депрессивное состояние. Нарушение баланса между центрами положительных и отрицательных эмоций становится причиной тяжелой формы депрессии, которая, в свою очередь, может привести к суициду. В этом случае человеку в большинстве случаев необходимы антидепрессанты.

Таким образом, нехватка серотонина вызывает нарушение сна, тревожность и агрессию, ухудшает память.

Повысить уровень серотонина можно несколькими способами. Один из самых простых –– принимать солнечные ванны. Солнечный свет стимулирует выработку этого вещества. Также можно уделить больше внимания физической активности. И конечно, нужно правильно питаться. Дело в том, что серотонин возникает при превращениях триптофана, пищевой аминокислоты, которую наш организм сам не синтезирует. Получить ее мы можем только с едой. Средняя суточная норма триптофана – 250 мг.

Продукты, в которых содержится триптофан

  1. Лидирующую позицию по содержанию триптофана занимает сыр. Например, в «Швейцарском» (50% жирности) на 100 г продукта приходится 1000 мг триптофана – это 400% от суточной нормы. Почти также много этой аминокислоты в «Рокфоре», «Чеддере», «Пошехонском». Чуть меньше – в «Пармезане», «Фете», брынзе, молоке и других молочных и кисломолочных продуктах (йогурт, кефир, сливки, творог).
  2. Яйца: куриные и перепелиные.
  3. Триптофан есть в разных видах мяса и птицы. Среди них – индейка, курица, говядина, баранина, свинина.
  4.  В рацион для хорошего настроения нужно включить рыбу и морепродукты: горбушу, морского окуня, сельдь, скумбрию, ставриду, судака, треску, щуку, кету, икру, кальмаров и другие.
  5. Крупы: гречиха, манка, кукурузная, овсяная, перловая, пшеничная, рисовая.
  6. Орехи и семена: арахис, грецкий орех, кедровый орех, миндаль, кунжут, семена подсолнечника, фисташки, фундук.
  7. Бобовые: горох, фасоль, чечевица.
  8. Грибы: белые, шиитаке, вешенки.

Еще один важный момент: чтобы достичь головного мозга и поучаствовать в синтезе серотонина, триптофану нужны углеводы. Поэтому составляйте свой рацион так, чтобы в нем были соответствующие продукты.

Питайтесь правильно, соблюдайте баланс, и хорошее настроение вам будет обеспечено.

Источник

Факт: положительные эмоции невозможны без участия гормонов. Стресс, депрессия, тоска и прочие негативные явления зачастую возникают из-за того, что блокируется выработка дофамина, серотонина, окситоцина и эндорфинов. Эндокринолог Ольга Пенкрат объясняет, что нужно делать, чтобы «подстегнуть» выработку «гормонов счастья», и чего избегать, дабы не впасть в депрессию.

Ольга Пенкрат
врач-эндокринолог первой категории медицинского центра «Мед-Практика»

Дофамин

Что это?

— Дофамин — биологически активное вещество, которое вырабатывается в мозгу синапсами нейронов и служит для передачи нервных импульсов. Кроме того, участвуя в регуляции сердечно-сосудистой системы, оно синтезируется в надпочечниках, почках и кишечнике. Это одно и то же химическое соединение, однако дофамин, синтезированный вне центральной нервной системы, в головной мозг не попадает и, соответственно, влияния на передачу нервных импульсов не оказывает.

Роль дофамина в организме

Как гормон:

  • повышает артериальное давление, частоту и силу сердечных сокращений;
  • расслабляет гладкую мускулатуру желудка и кишечника;
  • увеличивает фильтрацию жидкости, кровоток в почках, ускоряет выделение натрия с мочой.

Как нейромедиатор оказывает влияние на:

  • формирование мотивации;
  • чувство удовольствия;
  • ощущение награды и желания;
  • эмоциональные реакции, сопровождающие двигательную активность.

Выделению дофамина способствует:

  • Достижение цели и даже само предвкушение этого момента. Одни лишь мысли о триумфе вызывают выброс нейромедиатора. Когда же цель достигнута, выработка дофамина снижается.
  • Чувство любви. Вместе с гормоном окситоцином дофамин помогает формировать чувство привязанности, в том числе материнское. Кроме того, он обеспечивает возможность эффективно учиться на своих ошибках, а нехватка дофамина может приводить к игнорированию негативного опыта.
  • Приятные тактильные ощущения. Дофамин естественным образом вырабатывается в больших количествах во время интимной близости.

  • Употребление любимой пищи. Употребление всеми любимого шоколада повышает уровень дофамина. Однако своеобразными «кирпичиками», предшественниками дофамина, служат молекулы аминокислоты тирозина. Чем больше его содержание в продуктах, тем выше шанс получить удовольствие. Тирозин содержится, к примеру, в мясе, бобовых (соя, чечевица, фасоль), орехах, сыре и твороге.
  • Отдых и физическая активность. Отличный помощник в выработке дофамина — полноценный сон. Второй вариант противоположен — это любая активность, будь то занятие определенныи видом спорта или обычная пробежка. Дофамин призван мотивировать человека, который ждет какого-то вознаграждения в конце тренировки: похудения, отдыха и т.д. А за это предвкушение тоже отвечает дофамин.

Будьте осторожны. В обмене дофамина могут принимать участие некоторые кардиологические и психиатрические медицинские препараты. Шутить с этим процессом нельзя, обязательно посоветуйтесь с врачом.

Кстати

— Дофамин — не всегда синоним позитива, как многие привыкли считать. Он помогает организму адаптироваться к стрессовым ситуациям, выделяется при травмах и болевом синдроме.

Что тормозит выработку дофамина?

— Выработку и высвобождение дофамина в мозге в 5-10 раз увеличивают наркотические вещества. А затем — уменьшают, заставляя повышать дозу. Чувство удовольствия вырабатывается искусственным образом.

Если человек продолжает так себя «поощрять», постепенно мозг адаптируется к искусственно повышенному уровню дофамина, при этом сам производит его в меньших количествах. Это побуждает наркомана увеличивать дозу, чтобы вернуть приятные ощущения, ведь эйфория вдруг сменяется подавленностью и депрессией.

Блокирует выработку нейромедиатора также и злоупотребление жирной и сладкой пищей. По той же схеме, что и с наркотиками: организм требует еще и еще, что в итоге приводит к перееданию и пищевой зависимости.

Серотонин

Что это?

— Как и дофамин, серотонин является нейромедиатором и гормоном. 95% этого вещества вырабатывается слизистой оболочкой кишечника и лишь 5% — в головном мозге.

Роль серотонина в организме:

  • улучшает память, внимание, восприятие;
  • ускоряет и облегчает движения;
  • снижает болевой порог;
  • контролирует либидо и репродуктивную функцию;
  • обеспечивает полноценный сон;

  • помогает пищеварению;
  • уменьшает аллергические реакции;
  • регулирует сокращение матки и маточных труб во время родов;
  • способствует хорошему настроению;
  • участвует в синтезе гормонов гипофиза.

Выделению серотонина способствуют:

  • Триптофан и глюкоза. Триптофан — это аминокислота, из которой образуется серотонин. Глюкоза помогает триптофану добраться к мозгу для выработки серотонина.  Какая пища богата триптофаном? Это молочные продукты (особенно сыр), финики, сливы, инжир, томаты, соя и черный шоколад. Глюкозы много во фруктах, овощах, ягодах и меде.
  • Магний. Он способствует превращению триптофана в серотонин. Содержится во фруктах, орехах, бобовых и цельных зернах.

  • Солнечный свет. Для синтеза серотонина он абсолютно необходим. Витамин D регулирует переход триптофана в серотонин. Большое его количество действительно прибавит вам радости. Но помните: эффект этот необходимо постоянно подкреплять.

Будьте осторожны. Избыток серотонина порой провоцирует развитие серотонинового синдрома. Такое бывает при передозировке антидепрессантов ингибиторного типа. Их действие заключается в повышении уровня серотонина и его задержке в организме. Особенно часто проблема возникает, если человек занимается самолечением или игнорирует рекомендации врача в надежде на то, что увеличенная доза препарата подарит стойкое и сильное ощущение счастья.

Что тормозит выработку серотонина?

  • Кофеин. Мало того, что он снижает уровень серотонина, так еще и ухудшает аппетит.

  • Алкоголь подавляет синтез серотонина и блокирует функции уже имеющегося в организме гормона. Возникает риск возникновения абстинентного синдрома — физического и/или психического расстройства, развивающегося у больных наркоманией спустя некоторое время после прекращения приема наркотика или уменьшения его дозы (ломка). Противостоять этому синдрому, как правило, получается лишь с помощью очередной порции спиртного. Со временем это приводит к алкогольной зависимости.

Эндорфины

Что это?

— Эндорфины — группа химических соединений, которые естественным путем вырабатываются в нейронах головного мозга. 

Роль эндорфинов в организме:

  • обезболивающий эффект;
  • стрессоустойчивость;
  • функция поощрения: организм, благополучно преодолевший опасную для жизни ситуацию, получает поощрение в виде стимуляции центров удовольствия — чувство эйфории;
  • участие в регуляции возбуждения и торможения. В первой фазе стресса, когда вопрос жизни и смерти еще не решен, работает та часть эндорфинной системы, которая усиливает продуктивное мышление. После решения вопроса жизни и смерти наступает черед торможения — перехода организма в режим сбережения;

  • стимуляция процессов заживления: эндорфины ускоряют процессы регенерации;
  • способствуют формированию образного мышления, ассоциаций и творческих фантазий.

Выделению эндорфинов способствуют:

Секс. Это простая и быстрая возможность повышения концентрации эндорфинов. В момент интимной близости в кровь выбрасывается огромное количество «гормонов счастья».

Вкусная еда. Особенно любимая. Хороший обед — это отличный источник неиссякаемого удовольствия.

Позитивное мышление. Даже приятные мечты способны привести человека в состояние блаженства.

Ультрафиолет увеличивает концентрацию эндорфинов в организме

Что тормозит выделение эндорфинов?

— Длительное употребление алкоголя и наркотических веществ. Наличие хронических заболеваний.

Окситоцин

Что это?

— Этот гормон вырабатывается в гипоталамусе, отделе центральной нервной системы. Активное вещество поступает из клеток гипоталамуса в гипофиз, где хранится и выделяется под воздействием внешних стимулов.

Роль окситоцина в организме:

  • вызывает эмоциональную привязанность;
  • обеспечивает стрессоустойчивость;

  • способствует сокращению гладкой мускулатуры матки, помогая прохождению плода по родовым путям. Регулируя мускулатуру млечных протоков женской груди, обеспечивает здоровую лактацию.

Выделению окситоцина способствуют:

  • Прикосновения и чувство доверия. Любые приятные контакты с родными и близкими (и тактильные, и эмоциональные) вызывают активизацию окситоцина. Хорошим стимулятором для этого процесса становится и релакс-массаж.
  • Кормление ребенка грудью. Окситоцин при лактации способствует сокращению мышечного слоя молочной железы и выделению грудного молока из нее. В этом смысле кормящим мамам повезло. Но выделению окситоцина может поспособствовать и просто стимуляция ореолы молочной железы. Даже если у вас нет детей.

  • Сильная боль, хроническая боль. Это не самый приятный способ, но он работает. Окситоцин тоже призван справляться с болью. Возможно, поэтому некоторым людям нравится причинять себе боль.
  • Так же, как и в случае с перечисленными гормонами, на повышение уровня окситоцина может повлиять: любимая пища, оргазм, физические упражнения и хорошее расположение духа.

Что тормозит выработку окситоцина?

— Этому способствует в первую очередь алкоголь, а также отсутствие любви, дружбы, депрессия и изоляция от людей.

Как видите, повлиять на собственные эмоции вполне реально благодаря питанию, физическим нагрузкам, позитивному образу жизни и так далее. Главное — делать это разумно, без вреда для организма, и не переусердствовать. Учитесь не зацикливаться на проблемах и каждый день открывать для себя что-то новое. Это лучший способ естественно и безопасно для здоровья повысить уровень гормонов счастья и чувствовать себя на все сто! Важно также понимать, что большого клинического значения уровень данных биологически активных веществ не имеет, лабораторно в рутинной практике он не определяется. А вот при таких проблемах, как гормональная андрогения, гиперандрогения, сбои менструального цикла, анализ на определенную группу гормонов просто необходим. 

При создании материала частично была использована информация из книги «Регуляторные системы организма человека» В.А. Дубинина.

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Источник
  • Как научиться управлять серотонином?
  • Что случится, если уровень серотонина нарушится?
  • Но стоит ли сразу пускать в ход «тяжелую артиллерию»?
  • Как работают витамины для хорошего настроения?
  • Управлять гормонами счастья легко!

Serotonin-skeletalМожно ли научить наш мозг искусственно вырабатывать «гормон счастья» — серотонин? Эта задача непростая, но осуществимая, ведь, управление тонким гормональным балансом под силу любому человеку. Нужно лишь захотеть – и буквально через 5 минут у вас будет отличное настроение и готовность «свернуть горы». В этом стремлении вам помогут гормоны удовольствия и счастья:

  • серотонин – его называют гормоном счастья, который дарит чувство эйфории;
  • дофамин – он отвечает за наслаждение и закрепляет положительный опыт;
  • окситоцин – он рождает такие чувства, как любовь, нежность и привязанность.

Чаще всего эта «троица» работает в связке, формируя все наши позитивные эмоции. Но сейчас мы будет говорить именно о серотонине. Многие люди уже знают, как называется этот гормон радости и счастья. Но далеко не все понимают, как он работает. И еще меньше людей знают, как регулировать уровень этого гормона в организме.

Как научиться управлять серотонином?

Этот нейромедиатор, регулирующий наше с вами настроение, не так прост, как может показаться на первый взгляд. Наверняка вы думаете, что серотонин – еще один гормон, который вырабатывается в человеческом мозге. Это так, но лишь отчасти. Вот вам сухие факты: 95% серотонина вырабатывается в кишечнике. И только 5% — в мозге.

spor-mozga-s-zheludkom

Так неужели путь к нашему счастью лежит через желудок? И это не совсем так. Серотонин – сложное химическое вещество, производная аминокислоты триптофана и, по совместительству, менеджер нашего мозга. Этот гормон отвечает за обширный ряд процессов как в самом мозге, так и во всем организме человека:

  1. Серотонин в мозге помогает нервным клеткам лучше взаимодействовать.
  2. Гормон радости влияет на сон и аппетит, состояние мышц и работу организма, характер и настроение.
  3. Важнейший нейромедиатор оказывает воздействие на когнитивные функции (внимание, память, общение и пр.).
  4. Серотонин отвечает за нормальную свертываемость крови и стабильную работу кровеносной системы.
  5. Гормон радости помогает нам испытывать интерес и влечение к противоположному полу.

Что случится, если уровень серотонина нарушится?

Очень часто мы слышим о том, как низкий уровень гормона счастья – это плохо. Но организму человека вредит не только недостаток, но и избыток серотонина. Другими словами, любые нарушения выработки этого нейромедиатора провоцируют целый список негативных последствий и состояний:

  • плохое настроение и хроническую депрессию;
  • резкое снижение сексуального влечения;
  • проблемы с пищеварением и сном;
  • тягу к сладкому и набор веса;
  • понижение активности.

Перечисленные проблемы – лишь вершина айсберга. Работа серотонина, основанная на двух веществах – аминокислоте триптофан и ее производном 5-гидрокситриптофан, очень сложная. Иногда гормональный дисбаланс настолько выражен, что специалистам не остается ничего другого, как прописать антидепрессанты – ингибиторы обратного захвата серотонина.

Читайте также: Как бороться со стрессом на работе?

Но стоит ли сразу пускать в ход «тяжелую артиллерию»?

Мы знаем, что антидепрессанты действуют быстро. Но также мы знаем, что у них хватает недостатков, важнейшими из которых являются привыкание и различные побочные эффекты, способные серьезно пошатнуть и без того ослабленное здоровье. На изображении ниже показано, как «жестко работают» антидепрессанты. Стоит задуматься нужны ли такие радикальные меры???

mehanizm-dieistviya-antidepressantov

Есть ли безопасная альтернатива таблеткам? Есть. Это правильный образ жизни и умение смотреть на мир позитивно. «Рецепт» вашего счастья будет состоять не из набора лекарств, а из совершенно других компонентов:

  1. Питание. В здоровой пище есть все, что нужно для выработки гормона серотонина в достаточном количестве. Откажитесь от быстрых углеводов и вредной еды в пользу полезных углеводов и продуктов, содержащих триптофан. Серотонин «растет» на разнообразии: злаках и крупах, овощах и фруктах, яйцах и молочной продукции, нежирном мясе и жирной рыбе, орехах, семенах и сухофруктах.
    producty-striptofanom

    На изображении показаны продукты богатые триптофаном.

  2. Движение. Ученые не раз доказывали, что любая физическая активность быстро (буквально за 30-40 минут) повышает уровень серотонина в крови. Танцы, пешие прогулки, бассейн, езда на велосипеде, утренняя пробежка – активностей много, не обязательно идти в спортзал. Но есть одно «но»: активным нужно быть постоянно, а не время от времени.
  3. Сон и медитация. Счастливый человек умеет вовремя «выключаться» и отпускать негатив из своей жизни. Иногда сделать это сложно. И тогда на помощь приходят медитация и здоровый сон, во время которых уровень гормона счастья также повышается. Приучите себя ложиться и вставать в одно и то же время – и у вас не будет проблем с серотонином.
  4. Больше солнца. В нашем климате солнечные деньки – нечастое явление. Но даже в пасмурный день наша кожа все равно получает свою порцию ультрафиолета. А, значит, ответ на вопрос «как повысить серотонин» прост: чаще гуляйте. Прогулки подарят организму максимум гормона счастья и полезного витамина D.
  5. Омега-3. Нам сложно поддерживать оптимальный уровень незаменимых полиненасыщенных жирных кислот, которые в избытке содержатся только в мясе жирной рыбы северных морей. Но сейчас уже есть достойная альтернатива – комплексы БАДов с Омега-3. Такие добавки – настоящее «лакомство» для мозга и профилактика целого ряда заболеваний.
  6. Удовольствие. Серотонин отвечает за удовольствие и наслаждение. А как получить больше таких эмоций? Идей масса: например, влюбиться, найти новое увлекательное хобби, чаще встречаться с друзьями, больше времени проводить с близкими. Чем больше в вашей жизни будет ярких эмоций и позитива, тем выше будет и уровень гормона счастья.
  7. «Помощники».  К сожалению, даже при правильном питании не удается получить из пищи 100% необходимых для питания мозга и организма веществ. И тогда на помощь приходит «серотонин в таблетках». Это специальные растительные витаминные комплексы, которые помогают гормону счастья вырабатываться правильно и в необходимом объеме.

yarkie-emocii

Как работают витамины для хорошего настроения?

В отличие от антидепрессантов, которые ингибируют обратный захват серотонина, витамины на растительной основе действуют иначе – более мягко. Они приводят все нейромедиаторы в баланс и помогают гормону счастья вырабатываться в нужном количестве, не причиняя серьезного вреда организму человека:

  • борются с усталостью и раздражительностью;
  • повышают память, внимание и концентрацию;
  • устраняют бессонницу и другие нарушения сна;
  • защищают от депрессии и нервных расстройств;
  • возвращают интерес к жизни и нормализуют аппетит.

Постоянные стрессы на работе и дома не позволяют всегда быть на пике активности. Но теперь эта проблема решается легко: всего одна капсула растительных витаминов в день – и вам уже намного легче справляться с вызовами, которые подготовил для вас этот мир. Забывчивость, рассеянность и апатичность сменятся бодростью и позитивным настроением.

Управлять гормонами счастья легко!

Секрет эффективность растительных витаминов для настроения – в идеальном составе. В них нет ничего лишнего помимо активных компонентов – экстрактов лекарственных трав. Например, это могут быть:

  • трава зверобоя и клевера;
  • родиола розовая и валериана;
  • володушка и кора муиры пуамы.

Такие витамины даже при длительном применении часто оказываются более эффективными и безопасными в сравнении с синтетическими препаратами и антидепрессантами, вызывающими привыкание, эффект отмены, сонливость и другие побочные эффекты.

serotonin_megapozitive

Теперь вы знаете, как правильно повышать уровень серотонина в организме, чтобы положительный результат не заставил себя ждать. Позвольте гормону счастья вырабатываться в полном объеме – и ваша жизнь станет яркой, а каждый день будет приносить максимум пользы и удовольствия.

Источник
Серотонин
Serotonin-skeletal.png
Serotonin-Spartan-HF-based-on-xtal-3D-sf-web.png
Общие
Систематическое
наименование		 3-(2-аминоэтил)-1H-индол-5-ол
Сокращения 5-HT
Традиционные названия 5-гидрокситриптамин,
серотонин,
энтерамин,
тромбоцитин,
3-(β-аминоэтил)-5-гидроксииндол,
тромботонин
Хим. формула N2OC10H12
Физические свойства
Состояние твёрдое кристаллическое вещество, белого цвета
Молярная масса 176,2151 ± 0,0095 г/моль
Термические свойства
Т. плав. 167,5 °C
Т. кип. 416 ±30,0 °C
Химические свойства
pKa 10,4
Растворимость в воде 20 г/100 мл
Структура
Дипольный момент 2,98 Д
Классификация
Рег. номер CAS 50-67-9
PubChem 5202
Рег. номер EINECS 200-058-9
SMILES

NCCc1c[nH]c2ccc(O)cc12
InChI

1S/C10H12N2O/c11-4-3-7-6-12-10-2-1-8(13)5-9(7)10/h1-2,5-6,12-13H,3-4,11H2

QZAYGJVTTNCVMB-UHFFFAOYSA-N
ChEBI 28790
ChemSpider 5013
Безопасность
ЛД50 60 мг/кг (мыши, перорально),
81 мг/кг (мыши, внутривенно),
601 мг/кг (мыши, подкожно),
750 мг/кг (крысы, подкожно),
4500 мг/кг (крысы, внутрибрюшинно),
13 мг/кг (морские свинки, внутривенно),
5 мг/кг (кошка, внутривенно)
Токсичность

высокотоксичен для мелких животных (птиц, млекопитающих),
чрезвычайно токсичен (особенно при внутривенном введении) для крупных млекопитающих, а также человека

Hazard T.svg Hazard TT.svg
Приводятся данные для стандартных условий (25 °C, 100 кПа), если не указано иного.

Серотони́н, 5-гидрокситриптамин, 5-НТ — один из основных нейромедиаторов. По химическому строению серотонин относится к биогенным аминам, классу триптаминов. Серотонин часто называют «гормоном хорошего настроения» и «гормоном счастья»[1].

Содержание

  • 1 История
  • 2 Биосинтез
    • 2.1 Влияние солнечного света
  • 3 Рецепторы серотонина
  • 4 Метаболизм (анаболизм и катаболизм) серотонина
  • 5 Серотонин и норадреналин
  • 6 Физиологическая роль
    • 6.1 Серотонин как нейромедиатор
      • 6.1.1 Расположение нейронов
      • 6.1.2 «Круговорот» серотонина
      • 6.1.3 Функции серотонина
    • 6.2 Серотониновый синдром
    • 6.3 Серотонин как гормон
      • 6.3.1 Повышение свёртываемости крови
      • 6.3.2 Влияние на аллергические и воспалительные реакции
      • 6.3.3 Влияние на пищеварение
      • 6.3.4 Влияние на процессы в матке
      • 6.3.5 Влияние на половую систему
      • 6.3.6 Один из гормонов удовольствия
      • 6.3.7 Изменение уровня серотонина
  • 7 Патологии, связанные с серотонином
  • 8 Пищевые продукты
  • 9 См. также
  • 10 Примечания
  • 11 Литература
  • 12 Ссылки

История[править | править код]

В 1935 году итальянским фармакологом Витторио Эрспамером впервые было выделено вещество из слизистой желудочно-кишечного тракта, сокращающее гладкую мускулатуру. Некоторые считали, что это был всего лишь адреналин, но только через два года первооткрывателю удалось доказать, что этим веществом оказался ранее неизвестный амин. Эрспамер назвал полученное соединение «энтерамином»[2]. В 1948 году Морис Раппорт, Арда Грин и Ирвин Пейдж в Кливлендской клинике обнаружили сосудосуживающее вещество в сыворотке крови, которое назвали «серотонином». Структура данного вещества, предложенная Морисом Раппортом, в 1951 году была подтверждена химическим синтезом. В 1952 году было доказано, что энтерамин и серотонин — одно и то же вещество[3]. В 1953 году нейрофизиологам Ирвину Пейджу и Бетти Твэрег удалось обнаружить серотонин в головном мозге[4].

После открытия серотонина началось изучение его рецепторов. В 1957 Джон Гаддум провёл ряд исследований, по итогам которых выяснилось, что серотониновые рецепторы неоднородны: способность серотонина сокращать гладкие мышцы блокировалась диэтиламидом Д-лизергиновой кислоты (ЛСД — мощный галлюциноген и психотропный препарат вёл себя как агонист серотонина в периферических тканях), а свойство возбуждать вегетативные нервные узлы предотвращалось морфином. Соответствующие рецепторы были названы «Д»- и «М»-серотониновыми рецепторами. В 90-х годах XX века с помощью методов молекулярной биологии удалось выяснить, что существуют, по крайней мере, 14 видов серотониновых рецепторов, которые отвечают за разнообразные функции серотонина.

Биосинтез[править | править код]

Серотонин образуется из аминокислоты триптофана путём её последовательного 5-гидроксилирования ферментом 5-триптофангидроксилазой (в результате чего получается 5-гидрокситриптофан, 5-ГТ) и затем декарбоксилирования получившегося гидрокситриптофана ферментом триптофандекарбоксилазой. 5-триптофангидроксилаза синтезируется только в соме серотонинергических нейронов, гидроксилирование происходит в присутствии ионов железа и кофактора птеридина.

Влияние солнечного света[править | править код]

Для синтеза серотонина абсолютно необходим солнечный свет. Именно поэтому в солнечные дни человек пребывает в хорошем настроении. Этим же процессом можно объяснить и общеизвестную зимнюю депрессию[5][неавторитетный источник?].

В работе Ронда Патрика и Брюса Эймса сказано, что Витамин D регулирует переход триптофана в серотонин и взаимодействует с генетическими серотониновыми путями[6][неавторитетный источник?].

{displaystyle {ce {{text{триптофан}}->[{ce {{text{витамин}}D}}]{text{серотонин}}}}}

Рецепторы серотонина[править | править код]

Рецепторы серотонина представлены как метаботропными, так и ионотропными. Всего насчитывается семь типов таких рецепторов, 5-HT 1-7, причём 5-HT3-рецептор — ионотропный, остальные — метаботропные, семидоменные, связанные с G-белками. Установлено сходство метаботропных 5-HT рецепторов с рецепторами норадреналина.

5-HT1 тип, насчитывающий несколько подтипов: 5-HT1A, 5-HT1B, 5-HT1D, 5-HT1E, которые могут быть как пре-, так и постсинаптическими, подавляет аденилатциклазу; 5-HT4 и 5-HT7 — стимулируют; 5-HT2, насчитывающий несколько подтипов: 5-HT2А, 5-HT2B, 5-HT2C, которые могут быть только постсинаптическими, активирует инозитолтрифосфат. 5-HT5 также подавляет аденилатциклазу[7].

Для некоторых типов рецепторов обнаружены эндогенные лиганды, помимо серотонина. Это, например, 5HT-модулин (Leu-Ser-Ala-Leu), эндогенный лиганд 1B и 1D пресинаптических рецепторов, индуктор тревожности и стресса.

Структура серотонина имеет сходство со структурой психоактивного вещества ЛСД. ЛСД действует как агонист некоторых 5-HT рецепторов и ингибирует обратный захват серотонина, увеличивая его содержание.

Метаболизм (анаболизм и катаболизм) серотонина[править | править код]

Под действием фермента моноаминооксидазы (МАО) серотонин превращается в 5-гидроксииндолальдегид, который, в свою очередь, может обратимо превращаться в 5-гидрокситриптофол под действием алкогольдегидрогеназы. Необратимо 5-гидроксииндолальдегид под действием ацетальдегиддегидрогеназы превращается в 5-гидроксииндолуксусную кислоту, которая затем выводится с мочой и калом.

Серотонин является предшественником мелатонина, образующегося под действием фермента эпифиза ААНАТ в эпифизе.

Также, превращаясь с помощью МАО в 5-гидроксииндол-3-ацетальдегид, он может под действием альдегидредуктазы превратиться в триптофол, а под действием ацетальдегидрогеназы-2 — в оксииндолуксусную кислоту (5-HIAA).

Серотонин может принимать участие в формировании эндогенных опиатов, вступая в реакцию с ацетальдегидом с образованием гармалола.

Серотонин и норадреналин[править | править код]

Существует определённое сходство в строении клеточных рецепторов к серотонину и норадреналину, подобие их транспортных клеточных систем. Известно также, что норадреналин ингибирует выброс серотонина. На их связи основано действие антидепрессанта миртазапина, который, блокируя альфа-2 рецепторы норадреналина, по принципу отрицательной обратной связи повышает содержание в синаптической щели и норадреналина, и серотонина (так как его ингибирование также тормозится) до нормы.

Физиологическая роль[править | править код]

Физиологические функции серотонина чрезвычайно многообразны. Серотонин «руководит» очень многими функциями в организме. Например, очень интересны исследования его влияния на проявление боли.

Доктором Виллисом доказано, что при снижении серотонина повышается чувствительность болевой системы организма, то есть даже самое слабое раздражение отзывается сильной болью.

Серотонин как нейромедиатор[править | править код]

Расположение нейронов[править | править код]

Серотонин играет роль нейромедиатора в центральной нервной системе. Серотонинергические нейроны группируются в стволе мозга: в варолиевом мосту и ядрах шва. От моста идут нисходящие проекции в спинной мозг, нейроны ядер шва дают восходящие проекции к мозжечку, лимбической системе, базальным ганглиям, коре. При этом нейроны дорсального и медиального ядер шва дают аксоны, различающиеся морфологически, электрофизиологически, мишенями иннервации и чувствительностью к некоторым нейротоксичным агентам, например, метамфетамину.

«Круговорот» серотонина[править | править код]

Синтезированный нейроном серотонин закачивается в везикулы. Этот процесс является протон-сопряжённым транспортом. В везикулу с помощью протон-зависимой АТФазы закачиваются ионы H+. При выходе протонов по градиенту в везикулу поступают молекулы серотонина.

Далее, в ответ на деполяризацию терминали, серотонин выводится в синаптическую щель. Часть его участвует в передаче нервного импульса, воздействуя на клеточные рецепторы постсинаптической мембраны, а часть возвращается в пресинаптический нейрон с помощью обратного захвата. Ауторегуляция выхода серотонина обеспечивается путём активации пресинаптических 5-НТ рецепторов, запускающих каскад реакций, которые регулируют вход ионов кальция внутрь пресинаптической терминали. Ионы кальция, в свою очередь, активируют фосфорилирование фермента 5-триптофангидроксилазы, обеспечивающей превращение триптофана в серотонин, что приводит к усилению синтеза серотонина.

Обратный захват производится транспортером серотонина, двенадцатидоменным белком, производящим натрий-калий-сопряжённый транспорт. Вернувшийся в клетку медиатор расщепляется с помощью моноаминооксидазы до 5-гидроксилиндолилуксусной кислоты.

Химизм транспортных систем серотонина также подобен таковым норадреналина.

Функции серотонина[править | править код]

Серотонин облегчает двигательную активность, благодаря усилению секреции субстанции Р в окончаниях сенсорных нейронов путём воздействия на ионотропные и метаботропные рецепторы.

Серотонин наряду с дофамином играет важную роль в механизмах гипоталамической регуляции гормональной функции гипофиза. Стимуляция серотонинергических путей, связывающих гипоталамус с гипофизом, вызывает увеличение секреции пролактина и некоторых других гормонов передней доли гипофиза — действие, противоположное эффектам стимуляции дофаминергических путей.

Серотонин также участвует в регуляции сосудистого тонуса.

Серотониновый синдром[править | править код]

Избыток серотонина может быть потенциально опасен, вызывая последствия, известные как серотониновый синдром. Такая критическая концентрация серотонина зачастую является следствием параллельного применения антидепрессантов классов ингибиторов моноаминооксидазы и селективных ингибиторов обратного захвата серотонина[8].

Серотонин как гормон[править | править код]

Повышение свёртываемости крови[править | править код]

Серотонин играет важную роль в процессах свёртывания крови. Тромбоциты крови содержат значительные количества серотонина и обладают способностью захватывать и накапливать серотонин из плазмы крови. Серотонин повышает функциональную активность тромбоцитов и их склонность к агрегации и образованию тромбов. Стимулируя специфические серотониновые рецепторы в печени, серотонин вызывает увеличение синтеза печенью факторов свёртывания крови. Выделение серотонина из повреждённых тканей является одним из механизмов обеспечения свёртывания крови по месту повреждения.

Влияние на аллергические и воспалительные реакции[править | править код]

Серотонин участвует в процессах аллергии и воспаления. Он повышает проницаемость сосудов, усиливает хемотаксис и миграцию лейкоцитов в очаг воспаления, увеличивает содержание эозинофилов в крови, усиливает дегрануляцию тучных клеток и высвобождение других медиаторов аллергии и воспаления.

Местное (например, внутримышечное) введение экзогенного серотонина вызывает сильную боль в месте введения. Предположительно серотонин наряду с гистамином и простагландинами, раздражая рецепторы в тканях, играет роль в возникновении болевой импульсации из места повреждения или воспаления.

Влияние на пищеварение[править | править код]

Также большое количество серотонина производится в кишечнике. Серотонин играет важную роль в регуляции моторики и секреции в желудочно-кишечном тракте, усиливая его перистальтику и секреторную активность. Кроме того, серотонин играет роль фактора роста для некоторых видов симбиотических микроорганизмов, усиливает бактериальный метаболизм в толстой кишке. Сами бактерии толстой кишки также вносят некоторый вклад в секрецию серотонина кишечником, поскольку многие виды симбиотических бактерий обладают способностью декарбоксилировать триптофан. При дисбактериозе и ряде других заболеваний толстой кишки продукция серотонина кишечником значительно снижается.

Массовое высвобождение серотонина из погибающих клеток слизистой желудка и кишечника при воздействии цитотоксических химиопрепаратов является одной из причин возникновения тошноты и рвоты, диареи при химиотерапии злокачественных опухолей. Аналогичное состояние бывает при некоторых злокачественных опухолях, эктопически продуцирующих серотонин.

Влияние на процессы в матке[править | править код]

Большое содержание серотонина также отмечается в матке. Серотонин играет роль в паракринной регуляции сокращения матки и маточных труб и в координации родов. Продукция серотонина в миометрии возрастает за несколько часов или дней до родов и ещё больше увеличивается непосредственно в процессе родов. Также серотонин вовлечён в процесс овуляции — содержание серотонина (и ряда других биологически активных веществ) в фолликулярной жидкости увеличивается непосредственно перед разрывом фолликула, что, по-видимому, приводит к увеличению внутрифолликулярного давления.

Влияние на половую систему[править | править код]

Серотонин оказывает значительное влияние на процессы возбуждения и торможения в системе половых органов. Например, увеличение концентрации серотонина у мужчин задерживает наступление эякуляции.

Один из гормонов удовольствия[править | править код]

Серотонин часто называют «гормоном счастья», он вырабатывается в организме в моменты экстаза, его уровень повышается во время эйфории и понижается во время депрессии. Для выработки серотонина обязательно нужен ультрафиолет, недостаток ультрафиолета в зимнее время года и является причиной столь распространённой сезонной депрессии.

Изменение уровня серотонина[править | править код]

На уровень серотонина в организме можно влиять:

  • с помощью физических упражнений, изменения ритма и глубины дыхания
  • диетами
  • натуральными и химическими лекарственными препаратами
  • солнечным светом

Чтобы вырабатывался серотонин, в организм обязательно должны поступать триптофан и глюкоза. Глюкоза стимулирует повышенный выход инсулина в кровь, который даёт команду основным аминокислотам уйти из кровяного русла в депо, освобождая триптофану дорогу через гематоэнцефалический барьер в мозг на выработку серотонина.
Чтобы повысить уровень серотонина в плазме крови и, соответственно, в ЦНС, используются ингибиторы обратного захвата серотонина, например, сертралин. Эти препараты способны угнетать захват серотонина и тем самым повышать его концентрацию. Все лекарства этого ряда являются рецептурными препаратами и подлежат использованию только по назначению врача.

Патологии, связанные с серотонином[править | править код]

Дефицит или ингибирование серотонинергической передачи, например, вызванные снижением уровня серотонина в мозге является одним из факторов формирования депрессивных состояний, навязчивых расстройств и тяжелых форм мигрени.

Гиперактивация серотониновых рецепторов (например, при приёме некоторых наркотиков) может привести к галлюцинациям. C хронически повышенным уровнем их активности может быть связано развитие шизофрении[9].

Накопление серотонина в ЦНС вследствие приёма серотонинергических препаратов может приводить к возникновению серотонинового синдрома[10]:59.

Пищевые продукты[править | править код]

Пищевые продукты с повышенным содержанием триптофана (аминокислота, из которой образуется серотонин): молочные продукты (особенно сыр), финики, сливы, инжир, томаты[11], соя, чёрный шоколад, способствуют биосинтезу серотонина и часто улучшают настроение. Они же могут быть причиной острых токсических реакций (серотониновый синдром), если употребляются в больших количествах на фоне лечения некоторыми группами антидепрессантов — ингибиторами моноаминоксидазы (ИМАО) или селективными ингибиторами обратного захвата серотонина (СИОЗС).

См. также[править | править код]

  • 5-Гидрокситриптофан
  • Антидепрессанты
  • MDMA
  • ЛСД

Примечания[править | править код]

  1. ↑ Young SN (2007). “How to increase serotonin in the human brain without drugs”. Rev. Psychiatr. Neurosci. 32 (6): 394—99. PMC 2077351. PMID 18043762.
  2. ↑ Negri L (2006). “[Vittorio Erspamer (1909–1999)]”. Med Secoli [итал.]. 18 (1): 97—113. PMID 17526278.
  3. ↑ Rapport MM, Green AA, Page IH (1948). “Serum vasoconstrictor, serotonin; isolation and characterization”. J. Biol. Chem. 176 (3): 1243—51. PMID 18100415.
  4. ↑ B. M. Twarog and I. H. Page. Serotonin content of some mammaliantissues and urine and a method for its determination.Am J Physiol, 175(1):157-61, 1953.
  5. ↑ Гормон счастья: 95% серотонина находится в кишечнике
  6. ↑ Витамин D и Омега-3 жирные кислоты полезны при депрессии и психоневрологических заболеваниях
  7. ↑ Nelson DL (2004). “5-HT5 receptors”. Current drug targets. CNS and neurological disorders. 3 (1): 53—8. PMID 14965244.
  8. ↑ Isbister, G. K.; Bowe, S. J.; Dawson, A.; Whyte, I. M. (2004). “Relative toxicity of selective serotonin reuptake inhibitors (SSRIs) in overdose”. J. Toxicol. Clin. Toxicol. 42 (3): 277—85. DOI:10.1081/CLT-120037428. PMID 15362595.
  9. ↑ Dysconnection in Schizophrenia: From Abnormal Synaptic Plasticity to Failures of Self-monitoring. Дата обращения 7 октября 2011. Архивировано 23 августа 2011 года.
  10. ↑ Волков В.П. Ятрогенные психонейросоматические синдромы. — Тверь: Триада, 2014. — 320 с.
  11. ↑ Д. Абсентис. Х&С. Шариков, эпифиз и серотонин.

Литература[править | править код]

  • Ашмарин И. П., Ещенко Н. Д., Каразеева Е. П.  Нейрохимия в таблицах и схемах. — М.: «Экзамен», 2007.

Ссылки[править | править код]

  • Дубынин В. Серотонин. ИД «ПостНаука» (24 октября 2016). — лекция о превращениях триптофана, нейрохимии серотонина и действии антидепрессантов. Дата обращения 8 сентября 2017. Архивировано 8 сентября 2017 года.
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