Hope for IBD Patients as Scientists Uncover Cause of Severe Bowel Inflammation

By Health Correspondent

Scientists have uncovered a genetic pathway that appears to play a key role in some of the most severe cases of inflammatory bowel disease (IBD), raising hopes for more targeted treatments in the future.

Researchers at the National Institutes of Health (NIH) and collaborating institutions found that rare harmful mutations in a gene called GPR15 can disrupt the body's ability to control inflammation in the gut.

The study, published in Nature, focused on families with children affected by severe early-onset IBD, which includes conditions such as Crohn's disease and ulcerative colitis.

Using genetic sequencing, the team discovered that affected patients shared rare variants of the GPR15 gene. The gene normally helps guide a specialised group of immune cells into the lining of the colon, where they help prevent excessive inflammation.

Researchers found that when this process fails, these protective cells are absent from the gut lining. As a result, inflammatory immune cells build up and trigger severe intestinal inflammation.

Experts say the findings improve understanding of how the immune system maintains balance in the intestine and could lead to new treatments that target the underlying cause of disease rather than relying on broad immune-suppressing drugs.

Current IBD treatments can be effective for many patients, but some people do not respond or lose responsiveness over time, while others experience significant side effects.

The researchers suggest that therapies designed to restore GPR15 signalling or improve the movement of protective immune cells into intestinal tissue could offer a more precise way to treat inflammatory bowel disease.

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The discovery provides important new insight into the biology of IBD and may help pave the way for future diagnostic and treatment advances.

REFERENCES: J Cui, Z Chen, Yan Cheng, et al. GPR15-guided CD8+ T regulatory cells control intestinal inflammation. Nature. DOI 10.1038/s41586-025-09825-y

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