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The Gut Microbiota in Inflammatory Bowel Disease
Donal Sheehan1, Fergus Shanahan1
1Department of Medicine, APC Microbiome Institute, University College Cork, National University of Ireland, Ireland.
Gastroenterology Clinics of North America
|February 7, 2017
Summary
Genes, bacteria, and immunity play roles in inflammatory bowel disease (IBD) pathogenesis. While microbiota manipulation in adulthood is uncertain, gut bacteria may indicate risk, influence disease activity, and contribute to IBD complications.
Area of Science:
- Immunology
- Microbiology
- Genetics
Background:
- Inflammatory bowel disease (IBD) pathogenesis involves complex interactions between host genetics, bacterial communities (microbiota), and immune system responses.
- Genetic predisposition to IBD often stems from impaired microbial sensing or dysregulated immune responses to gut bacteria.
- The gut microbiota's crucial role in immune system development, established early in life, raises questions about its therapeutic manipulation in adulthood.
Purpose of the Study:
- To explore the multifaceted roles of genes, bacteria, and immunity in inflammatory bowel disease (IBD).
- To evaluate the potential and limitations of targeting the gut microbiota for IBD treatment in adult patients.
- To understand the microbiota's contribution to disease risk, activity, and extraintestinal manifestations in IBD.
Main Methods:
- Review of existing literature on IBD pathogenesis, focusing on genetic factors, microbial composition, and immune mechanisms.
- Analysis of the temporal relationship between microbiota development, immune maturation, and disease onset.
- Examination of studies investigating the microbiota as a biomarker and therapeutic target in IBD.
Main Results:
- Genetic factors influencing IBD risk are linked to host-microbe interactions, including microbial metabolite sensing and immune regulation.
- The early-life establishment of the microbiota and its influence on immune programming suggest challenges for adult-onset microbiota-based therapies.
- The gut microbiota is implicated as a potential marker for IBD risk, a modulator of disease severity, and a contributor to associated conditions outside the gastrointestinal tract.
Conclusions:
- IBD is a complex disease influenced by host genetics, bacterial communities, and immune responses.
- Therapeutic manipulation of the adult microbiota for IBD may be limited due to its early-life programming of the immune system.
- The gut microbiota remains a significant factor in IBD, potentially serving as a risk indicator, disease modifier, and contributor to extraintestinal issues.
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