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© Mélanie Falord, Tarek Msadek, Jean-Marc Panaud
Staphylococcus aureus "golden staph" in scanning electron microscopy.
Publication : Proceedings of the National Academy of Sciences of the United States of America

Binding of Escherichia coli adhesin AfaE to CD55 triggers cell-surface expression of the MHC class I-related molecule MICA

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Proceedings of the National Academy of Sciences of the United States of America - 05 Feb 2002

Tieng V, Le Bouguénec C, du Merle L, Bertheau P, Desreumaux P, Janin A, Charron D, Toubert A

Link to Pubmed [PMID] – 11830641

Proc. Natl. Acad. Sci. U.S.A. 2002 Mar;99(5):2977-82

MICA are distant homologs of MHC class I molecules expressed in the normal intestinal epithelium. They are ligands of the NKG2D activating receptor expressed on most gammadelta T cells, CD8+ alphabeta T cells, and natural killer cells and therefore play a critical role in innate immune responses. We investigated MICA cell-surface expression on infection of epithelial cell lines by enteric bacteria and show here that MICA expression can be markedly increased by bacteria of the diffusely adherent Escherichia coli diarrheagenic group. This effect is mediated by the specific interaction between bacterial adhesin AfaE and its cellular receptor, CD55, or decay-accelerating factor. It is extremely rapid after AfaE binding, consistent with a stress-induced signal. MICA induction on epithelial cells triggered IFN-gamma release by the NKG2D expressing natural killer cell line NKL. This host-bacteria interaction pathway could play a role in the pathogenesis of inflammatory bowel disease, a condition that implicates a bacterial trigger in genetically susceptible individuals. This was supported by the increased MICA expression at the surface of epithelial cells in colonic biopsies from Crohn’s disease-affected patients compared with controls.

http://www.ncbi.nlm.nih.gov/pubmed/11830641