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ZAP-70 enhances IgM signaling independent of its kinase activity in chronic lymphocytic leukemia
Authors:Chen Liguang  Huynh Lang  Apgar John  Tang Li  Rassenti Laura  Weiss Arthur  Kipps Thomas J
Affiliation:Moores UCSD Cancer Center, University of California-San Diego, 3855 Health Sciences Drive No. 0820, La Jolla, CA 92093, USA.
Abstract:We transduced chronic lymphocytic leukemia (CLL) cells lacking ZAP-70 with vectors encoding ZAP-70 or various mutant forms of ZAP-70 and monitored the response of transduced CLL cells to treatment with F(ab)(2) anti-IgM (anti-mu). CLL cells made to express ZAP-70, a kinase-defective ZAP-70 (ZAP-70-KA(369)), or a ZAP-70 unable to bind c-Cbl (ZAP-YF(292)) experienced greater intracellular calcium flux and had greater increases in the levels of phosphorylated p72(Syk), B-cell linker protein (BLNK), and phospholipase C-gamma, and greater activation of the Ig accessory molecule CD79b in response to treatment with anti-mu than did mock-transfected CLL cells lacking ZAP-70. Transfection of CLL cells with vectors encoding truncated forms of ZAP-70 revealed that the SH2 domain, but not the SH1 domain, was necessary to enhance intracellular calcium flux in response to treatment with anti-mu. We conclude that ZAP-70 most likely acts as an adapter protein that facilitates B-cell receptor (BCR) signaling in CLL cells independent of its tyrosine kinase activity or its ability to interact with c-Cbl.
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