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Related Experiment Videos

C. difficile toxin A increases intestinal permeability and induces Cl- secretion.

R Moore1, C Pothoulakis, J T LaMont

  • 1Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston 02115.

The American Journal of Physiology
|August 1, 1990
PubMed
Summary

Clostridium difficile toxin A significantly damages intestinal epithelial cells, increasing permeability and altering cell structure. This study reveals toxin A

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Area of Science:

  • Gastroenterology
  • Microbiology
  • Cell Biology

Background:

  • Clostridium difficile is a significant cause of antibiotic-associated diarrhea.
  • Toxin A is a primary virulence factor of Clostridium difficile.
  • Understanding toxin A's effects on intestinal barrier function is crucial for developing treatments.

Purpose of the Study:

  • To investigate the direct effects of Clostridium difficile toxin A on intestinal structure and barrier function.
  • To characterize the electrophysiological and morphological changes induced by toxin A in the absence of inflammatory cells.

Main Methods:

  • Ussing chamber experiments on guinea pig ileum explants.
  • Electrophysiological measurements including short-circuit current and transepithelial electrical resistance.

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  • Morphological analysis of absorptive cell structure and tight junctions.

    • Main Results:

    • Toxin A exposure increased epithelial permeability to mannitol and inulin.
    • Toxin A decreased short-circuit current and transepithelial electrical resistance.
    • Morphological changes included disrupted tight junctions and altered absorptive cell cytoskeleton, similar to cytochalasin D effects.

    Conclusions:

    • Clostridium difficile toxin A directly damages intestinal absorptive cells, compromising barrier integrity.
    • Toxin A induces significant structural and functional alterations in the intestinal epithelium.
    • The observed cellular changes suggest a mechanism involving the actin cytoskeleton.