Indole Propionic Acid Regulates Gut Immunity: Mechanisms of Metabolite-Driven Immunomodulation and Barrier Integrity

Aug 18, 2025Journal of microbiology and biotechnology

Indole Propionic Acid May Control Gut Immunity by Supporting Immune Balance and Gut Barrier Strength

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Abstract

Indole propionic acid (IPA) is produced by intestinal flora and is associated with multiple health benefits.

IPA exhibits anti-inflammatory and antioxidant effects.
It helps regulate intestinal immune cell function and enhances intestinal barrier function.
IPA is linked to the modulation of intestinal flora composition.
The compound may play a role in preventing and controlling intestinal diseases.
Research highlights IPA's potential as a target drug for future treatment of intestinal conditions.

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Indole propionic acid (IPA) is a functional indole derivative produced exclusively by intestinal flora through tryptophan metabolism. Numerous studies have shown that IPA has a variety of beneficial biological functions, including anti-inflammatory and antioxidant effects, immunomodulation, intestinal barrier protection, regulation of intestinal flora composition, and neuroprotection. IPA, as an intestinal microbial metabolite, actively participates in the establishment of intestinal immune homeostasis and positively influences the prevention and control of intestinal diseases, thereby playing an indispensable role in regulating host health. We conducted a comprehensive literature review to explore the synthesis of IPA, the mechanism of action on intestinal immunity, and the promise of its application in the treatment of related diseases. The physiological and biological effects of IPA were investigated to explore its potential application in future drug discovery. Obviously, IPA plays an important role in intestinal immunity and is effective in the treatment of related diseases. IPA helps regulate intestinal immune cell function, inhibiting inflammatory response and enhancing intestinal barrier function through its effects on the aryl hydrocarbon receptor, the pregnane X receptor, and other related signaling pathways. The development of IPA as a target drug for the treatment of intestinal diseases is promising. Although IPA research is still in the experimental animal model stage, there is growing interest in the many therapeutic applications of IPA and increasing opportunities to further modify IPA for future clinical applications. in vivo

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Indole Propionic Acid Regulates Gut Immunity: Mechanisms of Metabolite-Driven Immunomodulation and Barrier Integrity

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