[Mechanisms by which the gut microbiota regulates depressive disorder via the tryptophan metabolic pathway].

Nov 3, 2025Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences

How gut bacteria may influence depression through tryptophan metabolism

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Abstract

The gut microbiota may influence depressive disorder through the regulation of tryptophan metabolism.

  • Tryptophan metabolism is affected by intestinal microorganisms, which can alter its balance through inflammation and metabolic products.
  • In cases of depression, the kynurenine pathway of tryptophan metabolism is overly activated, leading to harmful metabolites that increase neuroinflammation in the brain.
  • Probiotics and traditional Chinese medicine may produce antidepressant-like effects by restoring gut microbiota balance and normalizing tryptophan metabolism.
  • Targeted inhibition of kynurenine 3-monooxygenase might reduce neuroinflammation by influencing microglial activity, potentially improving depressive behaviors.
  • The interaction between tryptophan metabolism and gut microbiota, linked to inflammation, could be crucial for developing new treatments for depression.

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