Altered Serum Factor Vlll-Related Antigen (VIII: AGN)/von Willebrand Factor (VIII: vWf) in Haemophiliacs with Inhibitors to Factor VIII Procoagulant Activity (VIII: C)

Molecular defects in interactions of platelets with the vessel wall

The objectives of this review have been to summarize the recent research on inherited defects involving abnormal platelet function and to illustrate how studies of hemorrhagic syndromes have led to an increased understanding of the molecular events involved in platelet adhesion and aggregation. Emphasis has been placed on the two primary hemostatic reactions: the interaction of platelets with von Willebrand factor to promote adhesion to the subendothelium, and the interaction of platelets with fibrinogen to promote platelet aggregation. Even as these events are more clearly defined, new concepts of molecular structure, function, and heterogeneity are emerging, and the variety of recognized genetic defects is becoming more complex.