rheumatoid arthritis gut microbiome
Home 5 News 5 Rheumatoid arthritis and the gut microbiome

Rheumatoid arthritis and the gut microbiome

Rheumatoid arthritis and the gut microbiome have now been linked by a breakthrough study funded by the National Institutes of Health.

Rheumatoid Arthritis (RA) has long baffled scientists, but a breakthrough study funded by the National Institutes of Health has unveiled a significant clue. Researchers, led by Meagan E. Chriswell and Kristine A. Kuhn, have identified a gut bacterium, Subdoligranulum didolesgii (named after the Cherokee word for arthritis), that might be a key trigger for this autoimmune disease. Published in Science Translational Medicine, the study explores how immune responses to this newly discovered bacterium might lead to the production of antibodies and T cells, ultimately attacking joints and causing chronic inflammation.

Understanding Rheumatoid Arthritis:

RA is an autoimmune disease where the body’s own antibodies and T cells attack the joints, resulting in inflammation, pain, and swelling. Over time, this condition can lead to irreversible joint damage, chronic pain, loss of function, and deformities. Despite extensive research, the exact cause of RA has remained elusive.

The Rheumtoid Arthritis – Gut Microbiome Connection:

Previous research hinted at mucosal surfaces triggering joint-targeting antibodies production, suggesting a link between bacteria in the mouth, airways, and gut, and RA. However, the specific bacteria responsible were unknown until now. In this study, researchers isolated antibody-secreting cells from individuals at risk for RA and discovered that these cells recognised Subdoligranulum didolesgii in the gut microbiome.

The Research Findings:

The team found that this bacterium was present in the feces of individuals at risk for or diagnosed with RA but absent in healthy individuals. When mice were given this bacterium orally, they developed antibodies and T cells attacking their joints, leading to visible swelling. The study indicated that immune responses to this bacterium might trigger the production of antibodies and T cells circulating throughout the body, attacking the joints and causing chronic inflammation.

Implications and Future Research:

These findings open new avenues for understanding RA and potentially developing targeted therapies. By identifying specific bacteria triggering immune responses, scientists can work towards more precise treatments, improving the quality of life for those affected by RA. Further research is needed to explore the exact mechanisms and develop interventions based on these discoveries.


The discovery of Subdoligranulum didolesgii as a potential trigger for RA is a significant step forward in our understanding of this debilitating autoimmune disease. This breakthrough not only sheds light on the complex origins of RA but also offers hope for more effective treatments in the future. Stay tuned for further developments as scientists continue to unravel the mysteries of autoimmune diseases, bringing us closer to innovative and targeted therapies.

jQuery(document).on('change', '.input-text', function(){ jQuery(this).trigger('keyup'); });