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The Journal of Immunology, 1999, 163: 844-853.
Copyright © 1999 by The American Association of Immunologists

TCR and CD28 Are Coupled Via ZAP-70 to the Activation of the Vav/Rac-1-/PAK-1/p38 MAPK Signaling Pathway1

Konstantin V. Salojin2,*, Jian Zhang2,* and Terry L. Delovitch3,*,{dagger}

* Autoimmunity/Diabetes Group, The John P. Robarts Research Institute, and {dagger} Departments of Microbiology, Immunology, and Medicine, University of Western Ontario, London, Ontario, Canada

CD28 costimulation amplifies TCR-dependent signaling in activated T cells, however, the biochemical mechanism(s) by which this occurs is not precisely understood. The small GTPase Rac-1 controls the catalytic activity of the mitogen-activated protein kinases (MAPKs) and cell cycle progression through G1. Rac-1 activation requires the phospho-tyrosine (p-Tyr)-dependent recruitment of the Vav GDP releasing factor (GRF) to the plasma membrane and assembly of GTPase/GRF complexes, an event critical for Ag receptor-triggered T cell activation. Here, we show that TCR/CD28 costimulation synergistically induces Rac-1 GDP/GTP exchange. Our findings, obtained by using ZAP-70-negative Jurkat T cells, indicate that CD28 costimulation augments TCR-mediated T cell activation by increasing the ZAP-70-mediated Tyr phosphorylation of Vav. This event regulates the Rac-1-associated GTP/GDP exchange activity of Vav and downstream pathway(s) leading to PAK-1 and p38 MAPK activation. CD28 amplifies TCR-induced ZAP-70 activity and association of Vav with ZAP-70 and linker for activation of T cells (LAT). These results favor a model in which ZAP-70 regulates the intersection of the TCR and CD28 signaling pathways, which elicits the coupling of TCR and CD28 to the Rac-1, PAK-1, and p38 MAPK effector molecules.




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