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- W1781830557 abstract "To clarify the subcellular mechanisms that mediate stimulation of Na+-K+-pump activity in pancreatic acinar cells by cholinergic agonists, we examined the effects of the phorbol ester, 12-O-tetradecanoylphorbol-13-acetate (TPA) and the Ca2+ ionophore A23187 on [3H]ouabain binding to dispersed guinea pig pancreatic acinar cells under conditions in which binding reflects the average rate of pump cycling. The phorbol ester more than doubled Na+-K+-pump activity as did the diacylglycerol analogue, 1-oleoyl-2-acetolyl-sn-3-glycerol. A23187 increased pump activity by a maximum of 31% at 0.3 microM but was progressively inhibitory at higher concentrations. The stimulatory effects of TPA and A23187 were additive, although either secretagogue elicited a less than additive response when added together with a maximally effective concentration of the cholinergic agonist, carbachol. Removal of extracellular Ca2+ had little effect on the pump response to TPA and did not reduce the maximal effect of A23187 but abolished the inhibitory effect seen at high ionophore concentrations in Ca2+-containing medium. These results indicate that both Ca2+ and protein kinase c are involved in regulating Na+-K+-pump activity in the pancreatic acinar cell." @default.
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- W1781830557 date "1987-04-01" @default.
- W1781830557 modified "2023-10-18" @default.
- W1781830557 title "Phorbol esters and A23187 regulate Na+-K+-pump activity in pancreatic acinar cells" @default.
- W1781830557 doi "https://doi.org/10.1152/ajpgi.1987.252.4.g499" @default.
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