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Intestinal epithelial barrier dysfunction in Crohn's disease

T Y Ma1

  • 1Department of Medicine, DVA Medical Center, Long Beach, California 90822, USA.

Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
|April 1, 1997
PubMed
Summary

A defective intestinal barrier, or "leaky gut," may cause Crohn's disease. This increased intestinal permeability allows more antigens to enter, potentially triggering inflammation in susceptible individuals.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • The exact cause of Crohn's disease (CD) is unknown.
  • Growing evidence points to a potential primary defect in intestinal barrier function in CD patients.
  • Intestinal permeability is increased in individuals with Crohn's disease.

Purpose of the Study:

  • To review the role of intestinal barrier defects in the etiology of Crohn's disease.
  • To explore the association between increased intestinal permeability, antigen exposure, and disease exacerbation.
  • To present the "leaky gut" hypothesis for Crohn's disease.

Main Methods:

  • Review of existing literature on intestinal barrier function in Crohn's disease.
  • Analysis of studies examining intestinal permeability in Crohn's patients and their relatives.

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  • Correlation of barrier function with antigen exposure and disease activity.

    • Main Results:

    • Crohn's disease patients exhibit a defective intestinal epithelial barrier with increased intestinal permeability.
    • A subset of healthy first-degree relatives of Crohn's patients also show increased intestinal permeability.
    • This subgroup displays heightened exposure to foreign antigens, linking permeability to antigen penetration.
    • Agents disrupting the intestinal barrier exacerbate CD, while reducing antigen load induces remission.

    Conclusions:

    • A primary defect in intestinal permeability, or "leaky gut," may be a key factor in initiating Crohn's disease.
    • Increased antigen penetration due to a compromised barrier could drive intestinal inflammation.
    • The "leaky gut" hypothesis provides a framework for understanding Crohn's disease pathogenesis.