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STAP-2 interacts with Pyk2 and enhances Pyk2 activity in T-cells.

Biochem. Biophys. Res. Commun.2017 Jun 17;488(1):81-87. Epub 2017 May 03
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摘要


STAP-2 is an adaptor molecule regulating several signaling pathways, including TLRs and cytokine/chemokine receptors in immune cells. We previously reported that STAP-2 enhances SDF-1α-induced Vav1/Rac1-mediated T-cell chemotaxis. However, the detailed mechanisms of STAP-2 involvement in enhancing T-cell chemotaxis remain unknown. In the present study, we demonstrate that STAP-2 directly interacts with Pyk2, which is a key molecule in the regulation of SDF-1α/CXCR4-mediated T-cell chemotaxis, and increases phosphorylation of Pyk2. Pyk2 itself can induce STAP-2 Y250 phosphorylation, and this phosphorylation is critical for maximal interactions between STAP-2 and Pyk2. Finally, SDF-1α-induced T-cell chemotaxis is inhibited by treatment with Pyk2 siRNA or AG17, an inhibitor of Pyk2, in Jurkat cells overexpressing STAP-2. Taken together, the Pyk2/STAP-2 interaction is a novel mechanism to regulate SDF-1α-dependent T-cell chemotaxis.

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