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- W2050135518 abstract "The regulation of Ca2+ influx in rat hepatocytes by glucagon and cyclic AMP (cAMP) was investigated. Exposing hepatocytes to glucagon resulted in an increase in the initial rate of Ca2+ entry. The concentrations of glucagon producing half-maximal and maximal stimulation of Ca2+ entry were 10−10and 10−8 M, respectively. A similar stimulation of Ca2+ influx was obtained in cells exposed to cAMP analogues or to forskolin. Exposing hepatocytes suspended in nominally Ca2+-free medium to glucagon for 3 min produced a 9% decrease in the size of the vasopressin-sensitive Ca2+ pool; in contrast, N6,2'-O-dibutyryladenosine 3':5'-cyclic monophosphate (Bt2cAMP) slightly augmented the size of this pool. Glucagon and Bt2cAMP syngergized the initial vasopressin-stimulated Ca2+ and Mn2+ influx rates, but only moderately increased the initial rate of Ca2+ entry after thapsigargin addition. The glucagon- and Bt2cAMP-stimulated Ca2+ influx was inhibited by the same antagonists of plasma membrane Ca2+ carriers that mediate Ca2+ entry during stimulation by vasopressin. Thus, cAMP does not stimulate Ca2+ entry through either a capacitative type of mechanism or inositol phosphate turnover. The authors' findings instead suggest that cAMP acts directly, or through protein kinase A on the same Ca2+ carriers that are activated by phospholipase C-linked receptor agonists." @default.
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- W2050135518 date "1994-07-01" @default.
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- W2050135518 title "Cyclic AMP stimulates Ca2+ entry in rat hepatocytes by interacting with the plasma membrane carriers involved in receptor-mediated Ca2+ influx" @default.
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- W2050135518 doi "https://doi.org/10.1016/0898-6568(94)90003-5" @default.
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