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J Biol Chem, Vol. 273, Issue 37, 23750-23757, September 11, 1998

Phosphoinositide 3-Kinase Regulates Phospholipase Cgamma -mediated Calcium Signaling

Lucia E. RamehDagger , Sue Goo Rhee§, Katherine Spokes, Andrius Kazlauskasparallel , Lewis C. CantleyDagger , and Lloyd G. Cantley

From the Divisions of Dagger  Signal Transduction and  Nephrology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, the parallel  Schepens Eye Research Institute, Boston, Massachusetts 02114, and the § Laboratory of Cell Signaling, NHLBI, National Institutes of Health, Bethesda, Maryland 20892

It has been demonstrated that the lipid products of the phosphoinositide 3-kinase (PI3K) can associate with the Src homology 2 (SH2) domains of specific signaling molecules and modify their actions. In the current experiments, phosphatidylinositol 3,4,5-trisphosphate (PtdIns-3,4,5-P3) was found to bind to the C-terminal SH2 domain of phospholipase Cgamma (PLCgamma ) with an apparent Kd of 2.4 µM and to displace the C-terminal SH2 domain from the activated platelet-derived growth factor receptor (PDGFR). To investigate the in vivo relevance of this observation, intracellular inositol trisphosphate (IP3) generation and calcium release were examined in HepG2 cells expressing a series of PDGFR mutants that activate PLCgamma with or without receptor association with PI3K. Coactivation of PLCgamma and PI3K resulted in an ~40% increase in both intracellular IP3 generation and intracellular calcium release as compared with selective activation of PLCgamma . Similarly, the addition of wortmannin or LY294002 to cells expressing the wild-type PDGFR inhibited the release of intracellular calcium. Thus, generation of PtdIns-3,4,5-P3 by receptor-associated PI3K causes an increase in IP3 production and intracellular calcium release, potentially via enhanced PtdIns-4,5-P2 substrate availability due to PtdIns-3,4,5-P3-mediated recruitment of PLCgamma to the lipid bilayer.


Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.



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