Gut Microbial Functional Ecology and Microbiota-Derived Metabolites in Rheumatoid Arthritis Autoimmunity

Area of Science:

• Microbiome research
• Immunology
• Rheumatology

Background:

• The gut microbiota significantly impacts rheumatoid arthritis (RA) pathogenesis and progression.
• It acts as a crucial link between environmental factors, the gut barrier, and joint inflammation.

Purpose of the Study:

• To review the role of gut microbiota and their metabolites in RA onset, progression, and treatment response.
• To analyze how microbial communities and their products influence immune cell activity and joint pathology.

Main Methods:

• Review of mechanistic studies on gut microbiota and RA.
• Analysis of microbial metabolites (e.g., SCFAs, indoles) and their immune effects.
• Examination of the gut-joint axis, including immune cell trafficking and synovial reactivation.

Main Results:

• Gut microbiota composition and function are altered in RA, influencing mucosal immunity and systemic autoimmunity.
• Microbial metabolites regulate immune cells like Treg, Breg, Th17, and osteoclasts, impacting RA immunopathology.
• Disease stage, host immunity, and medications reciprocally shape the gut microbiome.

Conclusions:

• Shifting RA microbiome research towards functional ecology analysis is crucial.
• This approach can aid in risk stratification, predicting treatment response, and developing microbiota-based interventions for RA.