Department of Laboratory Medicine and Pathology, Center for Immunology, Cancer Center, University of Minnesota Medical School, Minneapolis, Minnesota
Correspondence: Yoji Shimizu, Dept. of Laboratory Medicine and Pathology, University of Minnesota Medical School, MMC 334, 312 Church St. SE, Minneapolis, MN 55455. E-mail: shimi002{at}tc.umn.edu
T-cell recognition of foreign antigen and migration to specific anatomic sites in vivo involves transient adhesive contacts between ß1 integrins expressed on T cells and cell surface proteins or extracellular-matrix components. Engagement of the CD3-T-cell receptor (CD3-TCR) complex initiates a complex signaling cascade involving coordinated regulation and recruitment of tyrosine and lipid kinases to specific regions or microdomains in the plasma membrane. Although considerable attention has been focused on the signaling events by which the CD3-TCR complex regulates transcriptional events in the nucleus, CD3-TCR signaling also rapidly enhances integrin-mediated adhesion without increasing surface expression of integrins. Recent studies suggest that CD3-TCR signaling to ß1 integrins involves coordinated recruitment and activation of the Tec family tyrosine kinase Itk by src family tyrosine kinases and phosphatidylinositol 3-kinase. These signaling events that regulate integrin-mediated T-cell adhesion share both common and distinct features with the signaling pathways regulating interleukin-2 gene transcription.
Key Words: tyrosine kinase • cytoskeleton • phosphatidylinositol 3-kinase • Itk
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