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• W2039977892 abstract "The adenosine triphosphate-dependent calcium uptake by endoplasmic reticulum elements of lysed synaptosomes from rat brain cortex was studied. Caffeine exhibited a biphasic effect on this calcium uptake activity: concentrations of 1, 2, 5, 10 or 30 mM caffeine stimulated calcium uptake by 62, 111, 73, 88 and 60% respectively, whereas calcium uptake was inhibited by 55% at a 60-mM concentration of caffeine. Calcium release from endoplasmic reticulum elements of lysed brain synaptosomes was stimulated by 10 mM caffeine. Cyclic adenosine 3',5'-monophosphate stimulated calcium uptake in the lysed synaptosome preparation: exogenous concentrations of 0.05, 0.5, 5, 50, or 500 microM stimulated uptake by 67, 67, 95, 38 or 67% respectively. To explore the possibility that caffeine stimulated calcium uptake through inhibition of phosphodiesterase and consequent preservation of cyclic adenosine 3',5'-monophosphate, we have tested whether caffeine retained its ability to stimulate calcium uptake under conditions of maximal stimulation by cyclic adenosine 3',5'-monophosphate. The combined presence of 10 mM caffeine and 5 microM cyclic adenosine 3',5'-monophosphate resulted in an approximate doubling of the calcium uptake as compared to the uptake in the presence of the cyclic nucleotide alone, indicating that the stimulation due to caffeine does not occur via cyclic adenosine 3',5'-monophosphate." @default.
• W2039977892 created "2016-06-24" @default.
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• W2039977892 date "1987-11-01" @default.
• W2039977892 modified "2023-09-30" @default.
• W2039977892 title "Effects of caffeine and cyclic adenosine 3′,5′-monophosphate on adenosine triphosphate-dependent calcium uptake by lysed brain synaptosomes" @default.
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• W2039977892 doi "https://doi.org/10.1016/0006-8993(87)90425-2" @default.
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