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- W2022985666 abstract "The decay of human coagulation factor VIIIa has been studied by kinetic methods that ensure no interference through proteolytic feedback. The rate of decay of factor VIIIa activity was found to vary with the activator used to activate factor VIII. Thrombin-activated factor VIII-von Willebrand factor complex (fVIII-vWf) decayed at a rate of 0.31 min−1, whereas factor Xa-activated fVIII-vWf decayed at 0.11 min−1 under the same conditions. Factor VIII free of von Willebrand factor (factor VIII: C), although decaying at a generally slower rate after activation, still showed a dependence of decay rate on activator: thrombin-activated factor VIII:C decaying at a rate of 0.06 min−1, and factor Xa-activated factor VIII: C at 0.01 min−1. Readdition of von Willebrand factor (18 μg/ml) to factor VIII:C did not alter the observed activity or decay rate. The decay of the two species of factor VIIIa was studied, using the fVIII-vWf complex, in the presence of varying levels of factor IXa. Plots of reciprocal decay rates vs factor IXa concentration were linear, and nearly parallel for the two factor VIIIa species, with a mean slope of 0.56 min · nm−1. In addition to these studies, we have confirmed previous studies showing that the two forms of factor VIIIa differ in cofactor activity, but they do so in the same ratio as in their decay rates. We suggest that this difference and that observed in decay rate have a common cause, and incorporate this into a potential kinetic model of factor VIII activation and decay." @default.
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- W2022985666 date "1992-08-01" @default.
- W2022985666 modified "2023-09-23" @default.
- W2022985666 title "Thrombin-activated and factor Xa-activated human factor VIII: Differences in cofactor activity and decay rate" @default.
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- W2022985666 doi "https://doi.org/10.1016/0003-9861(92)90593-l" @default.
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