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The Journal of Immunology, 2004, 173: 2222-2226.
Copyright © 2004 by The American Association of Immunologists

CUTTING EDGE

Cutting Edge: LFA-1 Integrin-Dependent T Cell Adhesion Is Regulated by Both Ag Specificity and Sensitivity1

Kristen L. Mueller, Mark A. Daniels2, Alicia Felthauser, Charlly Kao, Stephen C. Jameson and Yoji Shimizu3

Department of Laboratory Medicine and Pathology, Center for Immunology, Cancer Center, University of Minnesota Medical School, Minneapolis, MN 55455

Ab stimulation of the TCR rapidly enhances the functional activity of the LFA-1 integrin. Although TCR-mediated changes in LFA-1 activity are thought to promote T cell-APC interactions, the Ag specificity and sensitivity of TCR-mediated triggering of LFA-1 is not clear. We demonstrate that peptide/MHC (pMHC) tetramers rapidly enhance LFA-1-dependent adhesion of OT-I TCR transgenic CD8+ T cells to purified ICAM-1. Inhibition of src family tyrosine kinase or PI3K activity blocked pMHC tetramer- and anti-CD3-stimulated adhesion. These effects are highly specific because partial agonist and antagonist pMHC tetramers are unable to stimulate OT-I T cell adhesion to ICAM-1. The Ag thresholds required for T cell adhesion to ICAM-1 resemble those of early T cell activation events, because optimal LFA-1 activation occurs at tetramer concentrations that fail to induce maximal T cell proliferation. Thus, TCR signaling to LFA-1 is highly Ag specific and sensitive to low concentrations of Ag.


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