Immune regulation by microbiome metabolites

Area of Science:

• Immunology
• Microbiology
• Metabolomics

Background:

• Commensal microbes and host immune systems engage in co-evolutionary mutual regulation.
• Microbial metabolites are key mediators, influencing host immunity through specific receptors and molecular targets.
• These metabolites play a role in nutrient harvest, host metabolism, and immune system modulation.

Purpose of the Study:

• To review the immune-regulatory functions of microbial metabolites.
• To highlight the role of microbial metabolites in host-microbe interactions.
• To discuss the impact of microbial metabolites on host metabolism and immune responses.

Main Methods:

• Literature review of studies on microbial metabolites and immune regulation.
• Analysis of evidence on microbial metabolite-receptor interactions.
• Examination of metabolites derived from carbohydrates, proteins, and bile acids.

Main Results:

• Immune cells express various metabolite-specific receptors (e.g., AhR, PXR, FXR, TGR5).
• Microbial metabolites signal bidirectionally, promoting immune tolerance and defense against infection.
• Adverse effects of microbial metabolites can occur in pathogenic conditions.

Conclusions:

• Microbial metabolites are critical regulators of the host immune system.
• These metabolites are essential for balancing immunity and tolerance, preventing inflammatory diseases.
• Understanding these interactions is vital for host health and disease management.