Polypeptide fraction from bovine factor VIII does not influence human platelet aggregation and blood coagulation

It is well known that high molecular weight bovine factor VIII is able to aggregate human platelets and possesses procoagulant activities. There is also growing body of evidence that the hydrolysis of bovine factor VIII abolishes its aggregating and coagulative properties. We have shown in this paper that a polypeptide fraction (molecular weight 1000-25000 daltons) from bovine factor VIII does not aggregate platelets nor affect blood coagulation. In this study we investigate the action of the polypeptide fraction derived from bovine factor VIII and suggest that its effect may occur only at endothelium level without an involvement of platelets as well as blood coagulation.