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- W2046594570 abstract "We searched for possible relationships between platelet aggregation induced by 12-O-tetradecanoyl phorbol 13-acetate (TPA) or thrombin and the translocation of protein kinase C. Using monoclonal antibodies against subspecies of protein kinase C, we noted a predominant expression of the isozyme, type II, in human platelets (M. Watanabe, M. Hagiwara, K. Onoda, and H. Hidaka, 1988, Biochem. Biophys. Res. Commun. 152, 642). Analysis of the subcellular distribution of protein kinase C revealed that 65% of the kinase activity was present in the cytosolic fraction in unstimulated platelets, with the remaining activity in the membrane fraction. Treatment of platelets with 100 nM TPA resulted in a greater than 60% decrease in protein kinase C activity in the cytosolic fraction and a greater than 200% increase in the activity in the membrane fraction, within 10 min after treatment. Translocation of the enzyme was also found after treatment of platelets with thrombin, although the response was of lower magnitude than that induced by TPA. Similar results were obtained by immunoblotting using MC-2a, an anti-type II protein kinase C monoclonal antibody. We also examined localization of the enzyme, by electron microscopic immunocytochemistry. The presence of type II protein kinase C seemed to be localized mostly in hyaluromeres and not in granulomeres. When platelets were fixed just after the addition of TPA (within 1 min), protein kinase C was localized at the submembranal region with no remarkable change in shape but there was a decrease in the number of granules in the cytoplasma and the open canalicular system was dilated. We then investigated the effects of cytochalasin B, W-7, ML-9, and H-7 on TPA-induced platelet aggregation and the translocation of protein kinase C. W-7 and ML-9 potently inhibited platelet aggregation but none of these compounds hampered the translocation. Thus, activation of protein kinase C may not be a complete requirement for the initiation of platelet aggregation." @default.
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- W2046594570 date "1990-07-01" @default.
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- W2046594570 title "Discrepancy of protein kinase C translocation and platelet aggregation—Immunocytobiochemical evidence" @default.
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- W2046594570 doi "https://doi.org/10.1016/0003-9861(90)90536-8" @default.
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