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- W2070198103 abstract "Studies were undertaken to determine whether factors which affect insulin secretion may exert their effects by altering the activity of an islet-cell plasma membrane Ca2+ extrusion pump. The insulin secretagogue, d-glucose, and a variety of phosphorylated hexoses, glucose 6-P, glucose 1,6-P, fructose 6-P, and fructose 2,6-P, were evaluated for their effect on an islet-cell plasma membrane (Ca2+ + Mg2+)-ATPase and were found to be ineffective in altering enzyme activity. d-Glucose also did not alter the rate of ATP-dependent Ca2+ uptake into plasma membrane vesicles. Similarly, cAMP, the catalytic subunit of cAMP-dependent protein kinase, arachidonic acid, or prostaglandin E2 did not affect either the plasma membrane (Ca2+ + Mg2+)-ATPase or the rate of ATP-dependent Ca2+ uptake into plasma membrane vesicles. Whereas previous studies have suggested that d-glucose and/or cAMP may inhibit ATPase activities in islets, these results indicate that the agents i.e., d-glucose and cAMP, which stimulate and/or potentiate insulin secretion from the islet cell, do not modify Ca2+ fluxes by directly regulating the islet-cell plasma membrane (Ca2+ + Mg2+)-ATPase. In contrast, the acidic phospholipids, phosphatidic acid and phosphatidylserine, stimulated the enzyme activity in a concentration-dependent manner whereas phosphatidylcholine had only a minimal effect. The diacylglycerol, dilinolein, stimulated the (Ca2+ + Mg2+)-ATPase activity in the presence of phosphatidylserine, but not in the absence of phospholipids. These effects were independent of phospholipid-stimulated protein phosphorylation in the islet-cell plasma membrane under the conditions of the ATPase assay." @default.
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- W2070198103 date "1985-04-01" @default.
- W2070198103 modified "2023-10-14" @default.
- W2070198103 title "Effect of insulin secretagogues and potential modulators of secretion on a plasma membrane (Ca2+ + Mg2+)-ATPase activity in islets of langerhans" @default.
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- W2070198103 doi "https://doi.org/10.1016/0003-9861(85)90152-3" @default.
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