Abstract
Integrin and cell adhesion molecule–regulated cellular adhesion plays an integral part in the recruitment and activation of lymphocytes. T-cell activation is a dynamic process subject to integrin-dependent and -independent regulation. Stimulation of human peripheral blood T cells by the anti-CD3 monoclonal antibody results in a rapid upregulation of integrin affinity. In conjunction with adhesion to endothelial cell–derived ligands and extracellular matrix proteins, anti-CD3 antibodies have been shown to result in significant increases in IL-2 production and T-cell proliferation. Therefore, at least two signal cascades are activated by ligation of the TCR: One results in a change in affinity of integrins for their ligands, whereas the other activates a signaling cascade that leads to gene induction. We investigated the effects of several tyrosine kinase inhibitors on human peripheral blood T-cell adhesion and adhesion-induced costimulation of IL-2 expression and secretion. These compounds did not inhibit anti-CD3–induced short-term (30 min) or long-term (18 hr) T-cell adhesion to VCAM-1, MAdCAM, or ICAM-1. When T cells were stimulated with anti-CD3 and allowed to adhere to VCAM-1, MAdCAM, or ICAM-1 in the presence of these inhibitors; IL-2 production was significantly reduced. The MEK specific inhibitor, PD98059, did not block T-cell adhesion to the various substrates, but it did block IL-2 synthesis. In addition, the tyrosine kinase inhibitors and PD98059 blocked anti-CD3–mediated stimulation of IL-2 synthesis. These data suggest that the signaling mechanism for anti-CD3–mediated integrin activation is distinct from the signaling pathway that results in adhesion-induced IL-2 synthesis via specific integrins and anti-CD3.
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Nowlin, D.M., Cardarelli, P.M., Young, L. et al. Inhibition of Tyrosine Kinases Blocks Adhesion-Induced T-Cell Coactivation Without Interfering with T-Cell Adhesion to Endothelial Cell–Surface Ligands. Inflammation 26, 31–43 (2002). https://doi.org/10.1023/A:1014421829234
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DOI: https://doi.org/10.1023/A:1014421829234