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• W2023355277 abstract "Thrombin binds to platelets and induces platelet activation, but the relationship of binding to activation is not clear. To better define this relationship, we have analyzed parameters of binding and activation by alpha-thrombin and by three analogous proteases that activate platelets somewhat differently. The proteases were nitro-alpha-thrombin, a derivative with nitrated tyrosine, gamma-thrombin, a product of partial proteolysis of alpha-thrombin, and trypsin, a homologous protease. Nitro-alpha-thrombin and native alpha-thrombin activated platelets similarly, whereas gamma-thrombin and trypsin activated to a slightly lesser extent than alpha-thrombin and only after a distinctive delay. alpha-Thrombin and nitro-alpha-thrombin bound to platelets to about the same extent, but only alpha-thrombin showed evidence of saturable binding. Hirudin, a thrombin inhibitor, blocked both platelet activation and saturable binding by alpha-thrombin. With nitro-alpha-thrombin, hirudin blocked platelet activation, but it had no effect on binding. gamma-Thrombin and trypsin bound less than alpha-thrombin and with no evidence of saturable binding. There were identical relationships between the total amount bound and the extent of platelet activation for the four proteases (some show no saturable binding) but distinct differences in the relationships of total amount bound and the rate of activation; similar rates of activation required the binding of three to five times more gamma-thrombin or trypsin than alpha-thrombin. That is, without saturable binding, activation was slower. These data thus show a correlation between total amount bound and extent of activation but no correlation between amount saturably bound and the extent of platelet activation. Conversely, the rate of activation is more closely correlated with saturable binding than with total binding. We conclude that high-affinity saturable binding is not essential for thrombin-induced platelet activation but that it may accelerate the reaction." @default.
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• W2023355277 date "1983-04-01" @default.
• W2023355277 modified "2023-09-23" @default.
• W2023355277 title "Thrombin-platelet interactions: An assessment of the roles of saturable and nonsaturable binding in platelet activation" @default.
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• W2023355277 doi "https://doi.org/10.1016/0003-9861(83)90524-6" @default.
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