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Chapter category: Adhesion Molecules

Integrin aEb7: Molecular Features and Functional Significance in the Immune System

This chapter appears in the following book:

I Domains in Integrins

Edited by: Donald Gullberg
ISBN: 0-306-47836-6
» Get more information about this book at landesbioscience.com «

Chapter authors:
Peter J. Kilshaw and Jonathan M.G. Higgins


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Abstract Alpha E beta 7 is an a-I domain-containing integrin that is expressed mainly on T cells, dendritic cells and mast cells in mucosal tissues. Expression depends largely or solely on TGF-b. The best characterized ligand for aEb7 is E-cadherin on epithelial cells. An exposed acidic residue on the distal aspect of E-cadherin domain 1 interacts with the MIDAS site in the aE a-I domain. By binding to E-cadherin, aEb7 contributes to mucosal specific retention of T cells, dendritic cells and mast cells within epithelia. Studies on aE knockout mice have identified an additional important function for this integrin in allograft rejection and have also indicated that it may have a role in immunoregulation. A recent finding that aEb7 is expressed by a major subset of regulatory T cells opens new avenues for functional studies.

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