Intestinal Barrier Function in Inflammatory Bowel Disease
Summary
The intestinal barrier comprises a multilayered defence system, including the mucus layer, specialised epithelial cells and intercellular junctions, that separates luminal contents from underlying tissue. Tight junctions and adherens junctions anchor epithelial cells to one another, while secreted mucins and antimicrobial peptides provide chemical protection and shape the microbial milieu. In healthy individuals this barrier permits selective nutrient absorption while preventing translocation of pathogens and toxins. In inflammatory bowel disease, defects in junctional proteins, alterations in mucin composition and shifts in commensal populations compromise barrier integrity, leading to increased epithelial permeability. This “leaky gut” facilitates antigen invasion, drives local immune activation and perpetuates chronic inflammation. Genetic susceptibility loci, environmental stressors and dysregulated cytokine networks converge on molecular pathways that regulate junctional assembly, endoplasmic reticulum homeostasis and epithelial restitution. Persistent barrier damage not only underlies disease onset and flares but also heightens the risk of complications such as colitis-associated neoplasia. Contemporary research aims to translate mechanistic insights into strategies for predicting disease course, monitoring mucosal healing and restoring barrier function through dietary interventions, biologics and innovative biomaterials.
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Intestinal Barrier Function in Inflammatory Bowel Disease publication trend
The graph below shows the total number of articles in intestinal barrier function in inflammatory bowel disease across all publications each year (not limited to Nature Index journals).
Technical terms
Tight junction: A specialised protein complex between epithelial cells that regulates paracellular passage of water, ions and solutes.
Adherens junction: A cell–cell adhesion structure that links neighbouring epithelial cells and supports tissue integrity.
Mucosal healing: The process of restoration of the intestinal lining after inflammation, predicting improved outcomes in inflammatory bowel disease.
Dysbiosis: An imbalance in the composition or function of the gut microbial community associated with disease.
Endoplasmic reticulum stress: A cellular state triggered by accumulation of misfolded proteins in the endoplasmic reticulum that can disrupt epithelial homeostasis.
References
- Pathologically catalyzed physical coating restores the intestinal barrier for inflammatory bowel disease therapy. Journal of Nanobiotechnology (2023).
- Protocadherin 20 maintains intestinal barrier function to protect against Crohn’s disease by targeting ATF6. Genome Biology (2023).
- Claudin-2 protects from colitis-associated cancer by promoting colitis-associated mucosal healing. Journal of Clinical Investigation (2023).
- Mechanisms regulating intestinal barrier integrity and its pathological implications. Experimental & Molecular Medicine (2018).
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