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- W2022254473 abstract "We investigated the molecular mechanism by which the Raf-1 kinase pathways that are linked to protein kinase C induce differential physiological effects, depending on the stimulus, by employing the pharmacological PKC activator PMA.Parental and v-Ha-ras transfected NIH 3T3 cells were chosen as test systems and these cells were transiently transfected with the pMTH vector that encodes dominant-negative (DN) PKC-epsilon with using Lipofectamine 2000. The cell proliferation reagent WST-1 was used for the quantitative determination of cellular proliferation. The Raf-1 kinase activity was measured by assessing the phosphorylation of recombinant MEK with using the immunoprecipitated Raf-1 proteins. The phosphorylated MEK protein bands were quantified by using Quantity One analysis software.The pharmacological PKC activator phorbol-12-myristate-13-acetate (PMA) and platelet-derived growth factor (PDGF) were able to induce the activation of Raf-1 kinase in the v-H-ras-transformed NIH3T3 fibroblasts. However, PMA was found to be much less sensitive PI3 kinase inhibitor or the chemical antioxidant than is PDGF. Especially, PMA mediated growth arrest while PDGF induced mitogenic signaling through the PKC-epsilon activation. Thus, the regulation of the Raf-1 cascade by both PDGF and PMA is likely to be intimately linked and they converge at the PKC level through different upstream pathways, as was shown by the inhibition of PDGF-induced Raf-1 kinase activation by the transient transfection with a dominant-negative mutant of PKC-epsilon.Taken together, these results imply that, depending on the stimulus, Raf-1 kinase leads to different physiological effects." @default.
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- W2022254473 date "2008-01-01" @default.
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- W2022254473 title "Differential Physiological Effects of Raf-1 Kinase Pathways Linked to Protein Kinase C Activation Depending on the Stimulus in v-H-ras-transformed Cells" @default.
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- W2022254473 doi "https://doi.org/10.4143/crt.2008.40.2.39" @default.
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