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• W2048400915 abstract "Because phospholipase C epsilon (PLC-epsilon) is activated by Galpha(12/13) and Rho family GTPases, we investigated whether these G proteins contribute to the increased inositol lipid hydrolysis observed in COS-7 cells after activation of certain G protein-coupled receptors. Stimulation of inositol lipid hydrolysis by endogenous lysophosphatidic acid (LPA) or thrombin receptors was markedly enhanced by the expression of PLC-epsilon. Expression of the LPA(1) or PAR1 receptor increased inositol phosphate production in response to LPA or SFLLRN, respectively, and these agonist-stimulated responses were markedly enhanced by coexpression of PLC-epsilon. Both LPA(1) and PAR1 receptor-mediated activation of PLC-epsilon was inhibited by coexpression of the regulator of G protein signaling (RGS) domain of p115RhoGEF, a GTPase-activating protein for Galpha(12/13) but not by expression of the RGS domain of GRK2, which inhibits Galpha(q) signaling. In contrast, activation of the G(q)-coupled M1 muscarinic or P2Y(2) purinergic receptor was neither enhanced by coexpression with PLC-epsilon nor inhibited by the RGS domain of p115RhoGEF but was blocked by expression of the RGS domain of GRK2. Expression of the Rho inhibitor C3 botulinum toxin did not affect LPA- or SFLLRN-stimulated inositol lipid hydrolysis in the absence of PLC-epsilon but completely prevented the PLC-epsilon-dependent increase in inositol phosphate accumulation. Likewise, C3 toxin blocked the PLC-epsilon-dependent stimulatory effects of the LPA(1), LPA(2), LPA(3), or PAR1 receptor but had no effect on the agonist-promoted inositol phosphate response of the M1 or P2Y(2) receptor. Moreover, PLC-epsilon-dependent stimulation of inositol phosphate accumulation by activation of the epidermal growth factor receptor, which involves Ras- but not Rho-mediated activation of the phospholipase, was unaffected by C3 toxin. These studies illustrate that specific LPA and thrombin receptors promote inositol lipid signaling via activation of Galpha(12/13) and Rho." @default.
• W2048400915 created "2016-06-24" @default.
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• W2048400915 date "2006-03-22" @default.
• W2048400915 modified "2023-10-16" @default.
• W2048400915 title "Gα_12/13- and Rho-Dependent Activation of Phospholipase C-ϵ by Lysophosphatidic Acid and Thrombin Receptors" @default.
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• W2048400915 doi "https://doi.org/10.1124/mol.105.017921" @default.
• W2048400915 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16554409" @default.
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