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Published on: February 14, 2021
The complement system in inflammatory bowel disease
Umang Jain1, Anthony R Otley, Johan Van Limbergen
1*Department of Microbiology and Immunology, †Department of Pediatrics, and ‡Department of Community Health and Epidemiology, Dalhousie University, and the IWK Health Centre, Halifax, NS, Canada.
Insights
The complement system, a key immune defense, is increasingly linked to inflammatory bowel disease (IBD) pathogenesis. Research into therapeutic complement inhibition offers new avenues for treating IBD.
Area of Science:
- Immunology
- Gastroenterology
- Innate Immunity
Background:
- The complement system is a crucial part of innate immunity, defending against microbes and clearing cellular debris.
- Dysregulation of complement activation is implicated in chronic inflammatory diseases.
- The role of complement in inflammatory bowel disease (IBD) remains under-researched.
Purpose of the Study:
- To review the existing evidence on the complement system's role in IBD pathogenesis.
- To explore the potential for therapeutic manipulation of complement in IBD.
Main Methods:
- Review of current literature on complement and IBD.
- Analysis of studies using genetically modified animal models.
- Examination of research involving complement antagonists.
Main Results:
- Emerging research implicates the complement system in the development of IBD.
- Novel experimental approaches are providing critical insights.
- Therapeutic strategies targeting complement are under investigation.
Conclusions:
- The complement cascade plays a significant role in IBD.
- Targeting complement activation presents a promising therapeutic strategy for IBD.
- Further research is warranted to fully elucidate and exploit complement's role in IBD.
Abstract:
Complement is well appreciated to be a potent innate immune defense against microbes and is important in the housekeeping act of removal of apoptotic and effete cells. It is also understood that hyperactivation of complement, or the lack of regulators, may underlie chronic inflammatory diseases. A pipeline of products to intervene in complement activation, some already in clinical use, is being studied in various chronic inflammatory diseases. To date, the role of complement in inflammatory bowel disease has not received a lot of research interest. Novel genetically modified laboratory animals and experiments using antagonists to complement effector molecules have kindled important research observations implicating the complement system in inflammatory bowel disease pathogenesis. We review the evidence base for the role and potential therapeutic manipulation of the complement cascade in inflammatory bowel disease.
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