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Serum antibodies associated with complex inflammatory bowel disease
Abdul A Elkadri1, Joanne M Stempak, Thomas D Walters
1The Zane Cohen Centre for Digestive Diseases, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada.
Antibodies to microbial antigens are linked to more aggressive inflammatory bowel disease phenotypes. Higher antibody levels in Crohn's disease (CD) indicate complicated disease, while in ulcerative colitis (UC), they predict colectomy.
Area of Science:
- Gastroenterology
- Immunology
- Microbiology
Background:
- Antibodies to microbial antigens are associated with specific diagnoses and phenotypes in inflammatory bowel disease (IBD).
- Prevalence of specific antibodies (pANCA, anti-Saccharomyces cerevisiae, anti-OmpC, anti-flagellin) was evaluated in Crohn's disease (CD) and ulcerative colitis (UC) patients.
Purpose of the Study:
- To assess the prevalence of key microbial antibodies in a large cohort of CD and UC patients.
- To analyze the association between these antibodies and various clinical outcomes and disease phenotypes.
Main Methods:
- Serological analyses for pANCA, IgA/IgG anti-Saccharomyces cerevisiae, anti-OmpC, and anti-flagellin were performed.
- Samples were collected from 391 CD patients, 207 UC patients, and 62 healthy controls.
- Patients were phenotyped using the Montreal classification.
Main Results:
- In CD, higher antibody levels correlated with younger age at diagnosis, longer disease duration, ileocolonic/perianal disease, internal perforations, and increased surgeries.
- In UC, elevated antibodies were associated with colectomy.
- Multivariate analysis confirmed associations between antimicrobial antibodies and complicated CD and UC features.
Conclusions:
- Increased serological markers indicate a more aggressive CD phenotype.
- Elevated antibodies in UC are linked to an increased likelihood of colectomy.
- These markers may help identify patients at risk for complex inflammatory bowel disease.
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