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• W1495442004 abstract "Both epidermal growth factor (EGF) and vanadate can activate 45Ca2+ influx into A431 epidermal carcinoma cells, without a detectable lag period possibly via a voltage-independent calcium channel. 22Na+/H+ exchange and 45Ca2+ uptake are mutually independent. Neither EGF nor vanadate induce any significant change in the steady-state levels of [1,3-3H]glycerol-labeled diacylglycerol, myo-[2-3H]inositol-labeled inositol trisphosphate or in 32P-labeled polyphosphoinositides or phosphatidic acid over the first 10 min of treatment, suggesting that the EGF receptor is not directly coupled to phosphatidylinositol turnover and that the two ion fluxes are not induced via a kinase C-dependent pathway. An increase in turnover of polyphosphoinositides can be detected in EGF-stimulated cells by nonequilibrium labeling with [32P]phosphate, but the increase shows a lag of about 1 min under the conditions used to detect 45Ca2+ influx. Chelation of free Ca2+ decreases but does not abolish the EGF-stimulated turnover. Preincubation with tetradecanoylphorbol acetate or 1-oleoyl-2-acetylglycerol inhibits the increase in 45Ca2+ uptake by both EGF and vanadate. Tetradecanoylphorbol acetate alone does not alter the basal rate of influx when added together with 45Ca2+. Surprisingly, the activation by vanadate and its inhibition by phorbol 12-myristate 13-acetate are unaffected by down-regulation of the EGF receptors through prior incubation with growth factor. Therefore, in A431 cells the activation of Na+/H+ exchange and Ca2+ influx appear to be independent of phosphatidylinositol turnover, and the EGF receptor does not itself function as a Ca2+ channel. Vanadate apparently activates influx through a mechanism distinct from or distal to the EGF receptor." @default.
• W1495442004 created "2016-06-24" @default.
• W1495442004 creator A5002460941 @default.
• W1495442004 date "1986-07-01" @default.
• W1495442004 modified "2023-09-30" @default.
• W1495442004 title "Activation of 45Ca2+ influx and 22Na+/H+ exchange by epidermal growth factor and vanadate in A431 cells is independent of phosphatidylinositol turnover and is inhibited by phorbol ester and diacylglycerol." @default.
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• W1495442004 doi "https://doi.org/10.1016/s0021-9258(18)67657-4" @default.
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