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A direct role for NKG2D/MICA interaction in villous atrophy during celiac disease

Sophie Hüe1, Jean-Jacques Mention, Renato C Monteiro

  • 1Equipe Avenir INSERM, Hôpital Necker-Enfants Malades, 75015 Paris, France.

Immunity
|September 11, 2004
PubMed

Insights

Celiac disease involves damage to the intestinal lining by intraepithelial lymphocytes (IELs). The MICA-NKG2D pathway, activated by gliadin, drives this IEL-mediated epithelial destruction.

Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • MICA (MHC class I polypeptide-related sequence A) interacts with the NKG2D receptor on immune cells.
  • Intraepithelial lymphocytes (IELs) play a role in intestinal immunity and epithelial damage.
  • Celiac disease is characterized by villous atrophy, suggesting epithelial damage.

Purpose of the Study:

  • To investigate the role of the MICA/NKG2D pathway in T-lymphocyte mediated intestinal epithelial destruction in Celiac disease.
  • To understand the mechanisms underlying epithelial damage in Celiac disease and refractory sprue.

Main Methods:

  • Analysis of MICA expression on epithelial cells in Celiac disease patients.
  • In vitro stimulation of epithelial cells with gliadin peptides.
  • Assessment of IEL activation and cytotoxicity.

Main Results:

  • MICA is highly expressed on epithelial cells in active Celiac disease.
  • Gliadin or its peptides induce MICA expression, mediated by IL-15.
  • NKG2D engagement activates IELs, leading to cytotoxicity against epithelial cells.

Conclusions:

  • The MICA/NKG2D pathway is crucial for gliadin-induced IEL activation and epithelial damage in Celiac disease.
  • This pathway contributes to villous atrophy observed in Celiac disease.
  • MICA/NKG2D signaling is key in activating intraepithelial immunity in response to danger signals.

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