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- W2098773815 abstract "Experiments were performed to elucidate the role of cyclic guanosine monophosphate (cGMP) on platelet activation induced by protein kinase C (PKC) activators and calcium ionophore. Human platelets were pretreated with acetylsalicylic acid and with hirudin and apyrase. Aggregation and ATP secretion in response to the PKC activators 4 beta-phorbol 12-myristate 13-acetate (PMA) and 1-oleoyl 2-acetylglycerol (OAG) were inhibited by the nitrovasodilator sodium nitroprusside (SNP), an activator of guanylate cyclase, and by 8-bromo-cyclic GMP (8-Br-cGMP). The experiments were performed in the presence of M&B 22948, an inhibitor of cGMP phosphodiesterase. SNP and 8-Br-cGMP also inhibited platelet aggregation and secretion evoked by the ionophore ionomycin. In fura-2 loaded platelets SNP did not affect basal cytosolic Ca2+ level nor the rise induced by low concentrations of ionomycin, both in the presence and absence of extracellular Ca2+. The phosphorylation of the 47 and 20 kDa protein induced by ionomycin or PMA were not significantly decreased by SNP or 8-Br-cGMP. The present results suggest that cGMP is able to inhibit both the PKC and the Ca(2+)-dependent pathways leading to platelet activation by interfering, similarly to cAMP, with processes following protein phosphorylation, close to the effector systems." @default.
- W2098773815 created "2016-06-24" @default.
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- W2098773815 date "1991-09-01" @default.
- W2098773815 modified "2023-09-26" @default.
- W2098773815 title "Platelet activation by diacylglycerol or ionomycin is inhibited by nitroprusside" @default.
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- W2098773815 doi "https://doi.org/10.1016/0167-4889(91)90093-d" @default.
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