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Infections in the immunopathogenesis of chronic inflammatory bowel disease
1Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
Abstract:
In chronic inflammatory bowel disease, self-destructive, exaggerated inflammation seems to occur in the absence of a well defined pathogen. However, epidemiological data strongly suggests that development of disease does not depend on endogenous factors alone. In this review, we summarize how a possible role for microbial factors can be reconciled with the current understanding of etiology and pathogenesis of IBD. The data presented does not support that IBD is an infectious disease nor that it is a self-antigen-specific autoimmune disease, however, recent findings increasingly suggest that tissue damage might be caused by a non-specific autoaggressive inflammation which is driven by common, ubiquitous microbial agents derived from the bacterial flora in the intestinal lumen.
Insights
Inflammatory bowel disease (IBD) involves exaggerated inflammation. Microbial factors, not specific pathogens or self-antigens, likely drive this non-specific inflammation and tissue damage in IBD.
Area of Science:
- Gastroenterology
- Immunology
- Microbiology
Background:
- Chronic inflammatory bowel disease (IBD) is characterized by exaggerated, self-destructive inflammation.
- Epidemiological data suggests that factors beyond endogenous elements contribute to IBD development.
Purpose of the Study:
- To review the potential role of microbial factors in the etiology and pathogenesis of IBD.
- To reconcile microbial involvement with current understandings of IBD.
Main Methods:
- Literature review synthesizing epidemiological, etiological, and pathogenetic data.
- Analysis of evidence for microbial involvement in IBD.
Main Results:
- Data does not support IBD as an infectious or self-antigen-specific autoimmune disease.
- Emerging evidence suggests common microbial agents from gut flora may drive non-specific autoaggressive inflammation.
- Ubiquitous microbial agents are implicated in IBD-related tissue damage.
Conclusions:
- IBD pathogenesis likely involves microbial factors, but not as a direct infection or classic autoimmune response.
- Non-specific inflammation driven by gut microbiota is a key mechanism in IBD.
- Further research into microbial-host interactions is crucial for understanding and treating IBD.