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- W2884765892 abstract "In normal plasma Factor VIII activity is associated with a series of high molecular weight glycoprotein complexes also containing von Willebrand Factor related activities. To study the possible binding of various forms of Factor VIII to released platelets, a solution containing Factor VIII was mixed with a dilute suspension of platelets, which were released by addition of collagen. After 10 minutes of incubation the mixture was layered over 1.5 ml of 30% human serum albumin solution in a centrifuge tube and subjected to centrifugation at 7,000xg. Fractions were collected and analyzed for Factor VIII activity and phospholipid-related procoagulant activity. When purified Factor VUI/von Willebrand Factor complex was studied no significant association between the Factor VIII activity and the platelets were found. When purified Factor VUI/von Willebrand Factor complex was activated with 10-3 units/ml of thrombin and then tested, the main part of the Factor VIII activity became associated with the platelets. Even at very low platelet counts this binding was clearly detectable. The binding occurred both in the presence and in the absence of Ca2+. Thus released platelets bind thrombin-activated Factor VIII but not the Factor VUI/von Willebrand Factor complex. It is known that activation of Factor VIII by thrombin causes dissociation of the Factor VIII from the von Willebrand Factor part of the complex. The data obtained indicate that this dissociation is necessary in order to get the Factor VIII to bind to the platelet receptor. It may work as an amplification mechanism where the first traces of Thrombin formed upon initiation of coagulation dissociates Factor VIII from von Willebrand Factor, followed by binding to receptor on released platelets and formation of Factor X activator complex on the surface of the platelets." @default.
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- W2884765892 date "1981-01-01" @default.
- W2884765892 modified "2023-09-25" @default.
- W2884765892 title "Presence Of Receptor For Activated Factor VIII On The Surface Of Released Platelets" @default.
- W2884765892 doi "https://doi.org/10.1055/s-0038-1652900" @default.
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