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• W2006039802 endingPage "255" @default.
• W2006039802 startingPage "242" @default.
• W2006039802 abstract "Ca2+ flux and protein phosphorylation have been implicated as playing an important role in the induction of the platelet release reaction. However, the interactions between Ca2+, protein phosphorylation, and the release reaction have been difficult to study because secretion in human platelets is independent of extracellular Ca2+. Thus, we studied rabbit platelets, which, unlike human platelets, require extracellular Ca2+ for serotonin release to occur. Thrombin, basophil platelet-activating factor (PAF), or ionophore A23187 treatment of intact 32PO43--loaded rabbit platelets resulted in a 200-400% increase in phosphorylation of P7P and P9P, respectively. These peptides were similar in all respects to the peptides phosphorylated in thrombin-treated human platelets. When Ca2+ was replaced in the medium by EGTA, (a) thrombin- and PAF-induced rabbit platelet [3H]serotonin release was inhibited by 60-75%, whereas ionophore-induced release was blocked completely; (b) thrombin-, PAF-, or ionophore-induced P9P phosphorylation was inhibited by 60%; and (c) ionophore-induced P7P phosphorylation was decreased by 60%, whereas that caused by thrombin or PAF was decreased by only 20%. At 0.25-0.5 U/ml of thrombin, phosphorylation preceded [3H]serotonin release with the time for half-maximal release being 26.0 +/- 1.3 s SE (n = 3) and the time for half-maximal phosphorylation being 12.3 +/- 1.3 s SE (n = 3) for P7P and 3.7 +/- 0.17 s SE (n = 3) for P9P. P9P phosphorylation was significantly inhibited (P less than 0.015) by removal by Ca2+ from the medium at a time point before any thrombin- or ionophore-induced serotonin release was detectable. Thus, our data suggest that Ca2+ flux precedes the onset of serotonin secretion and that the rabbit platelet is an appropriate model in which to study the effects of Ca2+ on protein phosphorylation during the platelet release reaction." @default.
• W2006039802 created "2016-06-24" @default.
• W2006039802 creator A5025294989 @default.
• W2006039802 creator A5045606913 @default.
• W2006039802 date "1980-02-01" @default.
• W2006039802 modified "2023-10-10" @default.
• W2006039802 title "Interaction of Ca2+ and protein phosphorylation in the rabbit platelet release reaction." @default.
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• W2006039802 doi "https://doi.org/10.1172/jci109666" @default.
• W2006039802 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/371361" @default.
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