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Tryptophan Metabolism & Pathways

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Contents

The Tryptophan availability is mainly regulated by three pathways: (i) the Kynurenine pathway; (ii) the Serotonin pathway; and (iii) the indole pathway; the latter includes the exogenous production of Indole / Indoles via the microbiome.
Liu et al. 2025 Trends in Cancer 11(7): 629-641

Tryptophan-metabolizing pathways also exist in some members of the human gut microbiota, such as Clostridium sporogenes, which can decarboxylate [Trp](brain://Vz--URFdDUqexFe…