Title : Direct inhibitory mechanisms of halothane on human platelet aggregation.

Pub. Date : 1996 Jul

PMID : 8694388






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1 The current study aimed to clarify the inhibitory mechanisms of halothane on thrombin-induced human platelet aggregation by measuring (1) platelet-surface glycoprotein Ib expression, (2) the concentration of intracellular free Ca2+ ([Ca2+]i) measured simultaneously with aggregation, (3) the concentration of intracellular inositol 1,4,5-triphosphate, and (4) the concentration of intracellular cyclic 3",5"-adenosine monophosphate ([cAMP]i). Halothane coagulation factor II, thrombin Homo sapiens
2 Halothane decreased the thrombin stimulated [Ca2+]i transient and inhibited platelet aggregation in a dose-dependent manner, both in the presence and in the absence of external Ca2+. Halothane coagulation factor II, thrombin Homo sapiens
3 Halothane inhibited the increase in inositol 1,4,5-triphosphate induced by thrombin. Halothane coagulation factor II, thrombin Homo sapiens
4 CONCLUSIONS: Halothane inhibits thrombin-induced human platelet aggregation by decreasing [Ca2+]i without inhibiting agonist-receptor binding; the inhibitory effect of halothane on [Ca2+]i might be mediated by a decrease in inositol 1,4,5 triphosphate and in part by an increase in [cAMP]i. Halothane coagulation factor II, thrombin Homo sapiens
5 CONCLUSIONS: Halothane inhibits thrombin-induced human platelet aggregation by decreasing [Ca2+]i without inhibiting agonist-receptor binding; the inhibitory effect of halothane on [Ca2+]i might be mediated by a decrease in inositol 1,4,5 triphosphate and in part by an increase in [cAMP]i. Halothane coagulation factor II, thrombin Homo sapiens