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N-Acetylserotonin

Names
IUPAC name N-acetamide
Other names N-acetyl-5-hydroxytryptamine, N-acetyl-5-HT
Identifiers
CAS Number	1210-83-9
3D model (JSmol)	Interactive image
ChEBI	CHEBI:17697
ChEMBL	ChEMBL33103
ChemSpider	879
ECHA InfoCard	100.013.560
MeSH	N-Acetylserotonin N-Acetylserotonin
PubChem CID	903
CompTox Dashboard (EPA)	DTXSID00153106
InChI InChI=1S/C12H14N2O2/c1-8(15)13-5-4-9-7-14-12-3-2-10(16)6-11(9)12/h2-3,6-7,14,16H,4-5H2,1H3,(H,13,15)Key: MVAWJSIDNICKHF-UHFFFAOYSA-N InChI=1/C12H14N2O2/c1-8(15)13-5-4-9-7-14-12-3-2-10(16)6-11(9)12/h2-3,6-7,14,16H,4-5H2,1H3,(H,13,15)Key: MVAWJSIDNICKHF-UHFFFAOYAX
SMILES CC(=O)NCCC1=CNC2=C1C=C(C=C2)O
Properties
Chemical formula	C12H14N2O2
Molar mass	218.252 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

N-Acetylserotonin (NAS), also known as normelatonin, is a naturally occurring chemical intermediate in the endogenous production of melatonin from serotonin. It is produced from serotonin by the enzyme aralkylamine N-acetyltransferase (AANAT) and is converted to melatonin by acetylserotonin O-methyltransferase (ASMT). Like melatonin, NAS is an agonist at the melatonin receptors MT₁, MT₂, and MT₃, and may be considered to be a neurotransmitter. In addition, NAS is distributed in some areas of the brain where serotonin and melatonin are not, suggesting that it may have unique central duties of its own instead of merely functioning as a precursor in the synthesis of melatonin.

Recently, NAS has been shown to act as a potent TrkB receptor agonist, while serotonin and melatonin are not. It produces robust antidepressant, neuroprotective, and neurotrophic effects that are TrkB-mediated. In addition, AANAT knockout mice which lack NAS display significantly greater immobility times versus control mice in assays of depression like the forced swim test.

NAS may also play a major role in the antidepressant effects of selective serotonin reuptake inhibitors (SSRIs) and monoamine oxidase inhibitors (MAOIs). The SSRI fluoxetine and the MAO-A inhibitor clorgyline upregulate AANAT indirectly through serotonergic mechanisms and thereby increase NAS levels after chronic administration, and this correlates with the onset of their antidepressant effects. Furthermore, light exposure inhibits the synthesis of NAS and reduces the antidepressant effects of MAOIs. These data strongly support a role for NAS in mood regulation and in antidepressant-induced therapeutic benefits.

Through a currently unidentified mechanism, NAS may be the cause of the orthostatic hypotension seen with clinical treatment of MAOIs. It reduces blood pressure in rodents, and pinealectomy (the pineal gland being a major site of NAS and melatonin synthesis) abolishes the hypotensive effects of clorgyline. Why orthostatic hypotension is commonly seen with MAOIs but not SSRIs (both of which increase NAS levels) however, is unknown.

See also

• Melatonin
• Serotonin

References

1. AXELROD J, WEISSBACH H (1960). "Enzymatic O-methylation of N-acetylserotonin to melatonin". Science. 131 (3409): 1312. doi:10.1126/science.131.3409.1312. PMID 13795316. {{cite journal}}: Unknown parameter |month= ignored (help)
2. WEISSBACH H, REDFIELD BG, AXELROD J (1960). "Biosynthesis of melatonin: enzymic conversion of serotonin to N-acetylserotonin". Biochimica et Biophysica Acta. 43: 352–3. doi:10.1016/0006-3002(60)90453-4. PMID 13784117. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
3. ^ Jang SW, Liu X, Pradoldej S; et al. (2010). "N-acetylserotonin activates TrkB receptor in a circadian rhythm". Proceedings of the National Academy of Sciences of the United States of America. 107 (8): 3876. doi:10.1073/pnas.0912531107. PMC 2840510. PMID 20133677. {{cite journal}}: Explicit use of et al. in: |author= (help); Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
4. Zhao H, Poon AM, Pang SF (2000). "Pharmacological characterization, molecular subtyping, and autoradiographic localization of putative melatonin receptors in uterine endometrium of estrous rats". Life Sciences. 66 (17): 1581–91. doi:10.1016/S0024-3205(00)00478-1. PMID 11261588. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
5. Nonno R, Pannacci M, Lucini V, Angeloni D, Fraschini F, Stankov BM (1999). "Ligand efficacy and potency at recombinant human MT2 melatonin receptors: evidence for agonist activity of some mt1-antagonists". British Journal of Pharmacology. 127 (5): 1288–94. doi:10.1038/sj.bjp.0702658. PMC 1566130. PMID 10455277. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
6. Paul P, Lahaye C, Delagrange P, Nicolas JP, Canet E, Boutin JA (1999). "Characterization of 2-[125I]iodomelatonin binding sites in Syrian hamster peripheral organs". The Journal of Pharmacology and Experimental Therapeutics. 290 (1): 334–40. PMID 10381796. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
7. ^ Oxenkrug GF (1999). "Antidepressive and antihypertensive effects of MAO-A inhibition: role of N-acetylserotonin. A review". Neurobiology (Budapest, Hungary). 7 (2): 213–24. PMID 10591054.
8. ^ Oxenkrug GF (1997). "". Voprosy Meditsinskoi Khimii (in Russian). 43 (6): 522–6. PMID 9503569.

• Tryptamines
• Biogenic amines
• Antioxidants
• Circadian rhythms
• Hormones of the pineal gland
• Natural tryptamine alkaloids
• Acetamides
• Phenols