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• W1808458423 startingPage "693" @default.
• W1808458423 abstract "The role of diacylglycerol (DG) formation from phosphatidylcholine in mitogenic signal transduction is poorly understood. We have generated this lipid at the plasma membrane by treating Rat-1 fibroblasts with bacterial phosphatidylcholine-specific phospholipase C (PC-PLC). This treatment leads to activation of mitogen-activated protein kinase (MAPK). However, unlike platelet-derived growth factor (PDGF) or epidermal growth factor (EGF), PC-PLC fails to activate Ras and to induce DNA synthesis, and activates MAPK only transiently (&lt; 45 min). Down-regulation of protein kinase C (PKC) -α, -Δ and -ε isotypes has little or no effect on MAPK activation by either PC-PLC or growth factors. However, Ro 31-8220, a highly selective inhibitor of all PKC isotypes, including atypical PKC-ζ but not Raf-1, blocks MAPK activation by PDGF and PC-PLC, but not that by EGF, suggesting that atypical PKC mediates the PDGF and PC-PLC signal. In line with this, PKC-ζ is activated by PC-PLC and PDGF, but not by EGF, as shown by a kinase assay in vitro, using biotinylated ε-peptide as a substrate. Furthermore, dominant-negative PKC-ζ inhibits, while (wild-type) PKC-ζ overexpression enhances MAPK activation by PDGF and PC-PLC. The results suggest that DG generated by PC-PLC can activate the MAPK pathway independent of Ras and phorbol-ester-sensitive PKC but, instead, via PKC-ζ." @default.
• W1808458423 created "2016-06-24" @default.
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• W1808458423 date "1997-05-01" @default.
• W1808458423 modified "2023-10-04" @default.
• W1808458423 title "Diacylglycerol generated by exogenous phospholipase C activates the mitogen-activated protein kinase pathway independent of Ras- and phorbol ester-sensitive protein kinase C: dependence on protein kinase C-ζ" @default.
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• W1808458423 doi "https://doi.org/10.1042/bj3230693" @default.
• W1808458423 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1218372" @default.
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• W1808458423 hasPublicationYear "1997" @default.
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