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• W87001907 abstract "Epidermal growth factor (EGF) is produced in large quantities by the kidney. We identified EGF-binding sites on cultured rat renal glomerular mesangial cells. These cells serve as a model system for the investigation of renal prostaglandin biosynthesis. Since EGF has been shown to modulate phospholipase activity in other cell lines, we studied the ability of EGF to increase arachidonate release and prostaglandin E2 (PGE2) production in mesangial cells. We found that EGF stimulated arachidonate release and PGE2 production in the presence of the Ca2+ ionophore A23187. This stimulation was markedly potentiated by the addition of phorbol myristate acetate (PMA), which activates protein kinase C. However, down-regulation of protein kinase C by prolonged PMA treatment did not block the ability of EGF to stimulate PGE2 production in the presence of A23187. EGF also markedly potentiated the stimulation of PGE2 production by vasopressin, which increases intracellular Ca2+ and activates protein kinase C in these cells. The stimulatory effects of EGF were not the result of prolongation or enhancement of an increase in intracellular Ca2+ produced by ionophore or vasopressin. Furthermore, the synergistic interaction of EGF with PMA and vasopressin occurred despite the fact that these agents markedly decreased EGF binding in mesangial cells, presumably owing to protein-kinase-C-mediated phosphorylation of the EGF receptor. We conclude that there exists a distinct pathway for EGF-stimulated arachidonate release and PGE2 production in rat renal glomerular mesangial cells, which is synergistic with, but not dependent on, activation of protein kinase C. In contrast with long-term mitogenic responses to EGF, this rapid response may allow delineation of the membrane phospholipid changes and signalling steps involved in this aspect of EGF action." @default.
• W87001907 created "2016-06-24" @default.
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• W87001907 date "1988-01-15" @default.
• W87001907 modified "2023-10-16" @default.
• W87001907 title "Epidermal growth factor is synergistic with phorbol esters and vasopressin in stimulating arachidonate release and prostaglandin production in renal glomerular mesangial cells" @default.
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• W87001907 doi "https://doi.org/10.1042/bj2490587" @default.
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