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• W1897961471 abstract "We compared the effects of phorbol 12-myristate 13-acetate (PMA) with those of prostaglandin E1 (PGE1) on the calcium transient in intact platelets and on 45Ca2+ uptake in saponin-treated platelets and microsomal fractions to determine the roles of protein kinase C and cyclic AMP in calcium sequestration. In intact platelets, PMA, like PGE1, stimulated the return of the calcium transient to resting values after a thrombin stimulus, but only the PGE1 effect was reversed by adrenaline. Both PMA and PGE1, when added before saponin, stimulated ATP-dependent 45Ca2+ uptake into the permeabilized platelets. Thrombin also stimulated 45Ca2+ uptake into saponin-treated platelets. Uptake of 45Ca2+ was increased in microsomal preparations from platelets pretreated with PMA or PGE1. PMA did not increase the cyclic AMP content of control or thrombin-treated platelets, and it induced a pattern of protein phosphorylation in 32P-labelled platelets different from that with PGE1. In correlation with the increased uptake of calcium in the saponin-treated preparation, we measured a rapid translocation of protein kinase C from supernatant to cell fraction after the addition of PMA. Our results suggest that activation of protein kinase C enhances calcium sequestration independently of an effect on cyclic AMP content in platelets. This activation could play a physiological role in the regulation of the calcium transient." @default.
• W1897961471 created "2016-06-24" @default.
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• W1897961471 date "1988-01-15" @default.
• W1897961471 modified "2023-09-26" @default.
• W1897961471 title "Comparison of the effects of phorbol 12-myristate 13-acetate and prostaglandin E1 on calcium regulation in human platelets" @default.
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• W1897961471 doi "https://doi.org/10.1042/bj2490487" @default.
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