Programming intestinal immune tolerance: The pivotal role of gut microbial metabolites.

Microbial metabolites are dynamic, context-dependent signals that regulate intestinal barrier function and local immune cell responses, shaping immune tolerance to commensals and dietary antigens.

• Why it matters: Immune tolerance must balance coexistence with commensal microbes and food antigens against protection from pathogens, yet the metabolite-driven mechanisms and context dependence remain incompletely defined.
• What they did: This review synthesizes known pathways linking gut microbial metabolites to host regulation of the intestinal barrier and immune responses, emphasizing modulation by factors such as age, genetic background, and inflammatory or infectious conditions.
• The result: Microbial metabolites may provide biomarker and therapeutic target opportunities for inflammatory bowel disease and other immune-related disorders, but broader clinical use needs further human validation and more precise intervention strategies.

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