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. 1988 Aug;85(16):5799–5803. doi: 10.1073/pnas.85.16.5799

Effects of ras-encoded proteins and platelet-derived growth factor on inositol phospholipid turnover in NRK cells.

T Kamata 1, H F Kung 1
PMCID: PMC281852  PMID: 2842749

Abstract

The role of ras-encoded proteins and platelet-derived growth factor (PDGF) in inositol phospholipid metabolism has been studied. PDGF stimulates inositol phospholipid turnover in confluent normal rat kidney (NRK) cells and enhances hydrolysis of phosphatidylinositol monophosphate and phosphatidylinositol bisphosphate in NRK cell membranes in the presence of guanosine 5'-[gamma-thio]triphosphate. The stimulatory effect of PDGF on phosphatidylinositol bisphosphate hydrolysis is not inhibited by pretreatment of NRK cells with pertussis toxin, implying that PDGF-stimulated phospholipase C activity of NRK cells is regulated by a pertussis toxin-insensitive guanine nucleotide-binding protein (G protein) that is different from Gi (inhibitory G protein) or Go (G protein of unknown function). When bacterially made human normal or oncogenic T24 ras protein is added to 32P-labeled NRK cell membranes in the presence of guanosine 5'-[gamma-thio]triphosphate, normal ras protein increases by 3-fold the formation of inositol trisphosphate, whereas T24 ras protein has no significant effect. In addition, normal ras protein and PDGF have additive effects on inositol trisphosphate production. Taken together, these data suggest that normal ras protein stimulates inositol phospholipid turnover in NRK cells by means of a pathway different from the PDGF-regulated one and that oncogenic ras protein is without significant stimulatory effect in this action.

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Selected References

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