Agglutination of Formalin-Fixed, Platelet-Type von Willebrand’s Disease Platelets by Human von Willebrand Factor

Summary

The interaction of platelets and von Willebrand factor (vWF) in platelet-type von Willebrand’s disease (vWD) was characterized using formalin-fixed platelets from the patients. Formalin-fixed patient platelets were agglutinated directly by human vWF in normal plasma and type IIB vWD plasma, but not in type IIA vWD plasma. In the presence of a small amount of normal vWF, ristocetin-induced agglutination of patient platelets was enhanced with low concentrations of ristocetin. Wheat germ agglutinin and EDTA inhibited vWF-induced agglutination, although EDTA had no effect on ristocetin (plus vWF)-induced agglutination. These results demonstrate that vWF-induced agglutination of platelet-type vWD platelets is independent of active platelet metabolism but requires divalent cations, and suggest that platelet membrane glycoprotein I (GPI) would be involved in this agglutination.

Key words

von Willebrand’s disease - Platelet-type von Willebrand’s disease - von Willebrand factor - Platelet agglutination - Ristocetin

• References

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