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Genes Dev. 1998 Mar 15;12(6):770-5.

Pyk2 is a downstream mediator of the IL-2 receptor-coupled Jak signaling pathway.

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  • 1Department of Immunology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo, 113, Japan.


Many cytokines transmit signals to the cell interior through activation of receptor-associated, Janus family protein tyrosine kinases (Jak PTKs). The interleukin-2 receptor (IL-2R) is associated with the Jak1 and Jak3 PTKs, and ligand-induced activation of these PTKs is essential for lymphocyte proliferation. Here, the nonreceptor PTK, Pyk2, was found to be activated following IL-2 stimulation in a Jak-dependent manner. Furthermore, physical association was detected between endogenous Pyk2 and Jak3, and a dominant interfering mutant of Pyk2 inhibited IL-2-induced cell proliferation without affecting Stat5 activation. Collectively, these results suggest that Pyk2 is a newly identified component of the Jak-mediated IL-2 signaling pathway.

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