1. Metabolic Enzyme/Protease
    Protein Tyrosine Kinase/RTK
  2. Endogenous Metabolite
    Trk Receptor

N-Acetyl-5-hydroxytryptamine (Synonyms: N-Acetylserotonin; Normelatonin; O-Demethylmelatonin)

Cat. No.: HY-107854
Handling Instructions

N-Acetyl-5-hydroxytryptamine is a Melatonin precursor, and that it can potently activate TrkB receptor.

For research use only. We do not sell to patients.

N-Acetyl-5-hydroxytryptamine Chemical Structure

N-Acetyl-5-hydroxytryptamine Chemical Structure

CAS No. : 1210-83-9

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N-Acetyl-5-hydroxytryptamine is a Melatonin precursor, and that it can potently activate TrkB receptor.

IC50 & Target[1]

Human Endogenous Metabolite




In Vitro

N-Acetyl-5-hydroxytryptamine (NAS), a precursor of Melatonin, is acetylated from serotonin by AANAT (arylalkylamine N-acetyltransferase). N-acetylserotonin activates TrkB receptor in a circadian rhythm. N-Acetyl-5-hydroxytryptamine swiftly activates TrkB in a circadian manner and exhibits antidepressant effect in a TrkB-dependent manner. N-Acetyl-5-hydroxytryptamine rapidly activates TrkB, but not TrkA or TrkC, in a neurotrophin- and MT3 receptor-independent manner[1].

In Vivo

To explore whether N-Acetyl-5-hydroxytryptamine, can trigger TrkB activation in vivo, TrkB F616A knockin mice are employed, where it has been shown that TrkB F616A activation can be selectively blocked by 1NMPP1, a derivative of kinase inhibitor PP1, leading to TrkB-null phenotypes. To assess whether N-Acetyl-5-hydroxytryptamine can mimic BDNF, cortical neurons from TrkB F616A knockin mice are prepared. In alignment with a previous report, BDNF- and NAS-mediated TrkB phosphorylation are selectively reduced by 1NMPP1 but not by K252a, whereas serotonin or Melatonin had no effect . These findings suggest that NAS strongly provokes both wild-type TrkB and TrkB F616A tyrosine phosphorylation and activation[1].

Animal Administration

Two-month-old TrkB F616A mice are pretreated with 1NMPP1 in drinking water (50 μM) 1 day before the experiment, followed by administration of N-Acetyl-5-hydroxytryptamine (20 mg/kg, i.p.) or Melatonin (1 mg/kg, i.p.). Mice are killed at 1 h. The brain homogenates are analyzed by immunoblotting with anti-p-TrkB. Two- to three-month-old BDNF forebrain conditional knockout mice are injected i.p. with N-Acetyl-5-hydroxytryptamine or Melatonin. Mice are killed at 0, 0.5, 1, or 2 h following drug administration. Brain lysates are prepared and analyzed by immunoblotting with anti-phospho-TrkB Y816[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight









Please store the product under the recommended conditions in the Certificate of Analysis.


Room temperature in continental US; may vary elsewhere

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Cat. No.: HY-107854