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Cell death in the colonic epithelium during inflammatory bowel diseases: CD95/Fas and beyond

Lina Chen1, Sun-Mi Park, Jerrold R Turner

  • 1Ben May Department for Cancer Research, University of Chicago, Chicago, Illinois 60637, USA.

Inflammatory Bowel Diseases
|January 6, 2010
PubMed

Insights

The CD95/CD95L system

Area of Science:

  • Immunology and Molecular Biology
  • Gastroenterology and Cell Biology

Background:

  • CD95 (death receptor) binding its ligand (CD95L) initiates apoptosis via a death-inducing signaling complex.
  • The CD95/CD95L system is implicated in inflammatory bowel disease (IBD) due to high CD95 expression and increased epithelial apoptosis in IBD.
  • Recent findings highlight CD95's non-apoptotic functions beyond immune cells.

Purpose of the Study:

  • To critically review the role of CD95 as an apoptosis-inducing receptor in IBD.
  • To explore alternative mechanisms contributing to epithelial cell loss in IBD.

Main Methods:

  • Literature review and critical analysis of existing data.
  • Examination of studies investigating CD95 expression and function in the context of IBD.
  • Evaluation of evidence for both apoptotic and non-apoptotic roles of CD95.

Main Results:

  • While CD95 is a known apoptosis inducer, its direct role in IBD pathogenesis via epithelial apoptosis is debated.
  • Evidence suggests CD95 may have non-apoptotic functions in non-immune cells relevant to IBD.
  • Alternative mechanisms for epithelial cell loss in IBD require further investigation.

Conclusions:

  • The direct contribution of CD95-mediated apoptosis to epithelial cell loss in IBD may be less significant than previously thought.
  • Non-apoptotic functions of CD95 in intestinal epithelial cells warrant further research in IBD.
  • Understanding diverse CD95 functions is crucial for elucidating IBD etiology.

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