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Serotonin Synthesis Pathway
- Molecular classification
- Metabolic Pathway
01
Overview
The serotonin synthesis pathway is a metabolic route responsible for the biosynthesis of serotonin (5-hydroxytryptamine, 5-HT) from the essential amino acid L-tryptophan. This pathway consists of two main enzymatic steps: hydroxylation of L-tryptophan by tryptophan hydroxylase (TPH) to form 5-hydroxytryptophan (5-HTP), and decarboxylation of 5-HTP by aromatic amino acid decarboxylase (AAAD) to form serotonin. Serotonin produced via this pathway regulates diverse functions, including central nervous system neurotransmission affecting mood, sleep, appetite, and cognition, as well as gastrointestinal motility and secretion. Alterations or dysregulation within this pathway are implicated in various disorders. Tryptophan intake can influence brain levels of serotonin because tryptophan crosses the blood-brain barrier, while serotonin itself does not.
- Other names
- 5-HT Synthesis Pathway5-Hydroxytryptamine Synthesis PathwayTryptophan to Serotonin Pathway
02
Mechanism of action
Inhibition of serotonin synthesis
03
Biological functions
Serotonin biosynthesisNeurotransmitter productionHormone productionMelatonin precursor production
04
Disease associations
DepressionAnxiety disordersIrritable Bowel Syndrome (IBS)Carcinoid Syndrome
05
Safety considerations
Potential for drug interactionsSide effects related to altered serotonin levelsVariability in individual response to tryptophan supplementation
06
Interacting drugs
TPH inhibitors
1 more in the full profile.
07
Biomarkers
Urinary 5-HIAA (5-hydroxyindoleacetic acid)
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