Conditions Influencing the Interaction of Asialo von Willebrand Factor with Human Platelets – The Effects of External Ionized Calcium Concentration and the Role of Arachidonate Pathway

Summary

We have studied the interaction of ASvWf with human platelets in PRP and in suspensions of washed platelets containing either physiological or low external ionized calcium concentration [Ca²⁺]₀. In hirudin-PRP or in washed platelets in 1.5-2 mM CaCl₂, ASvWf up to 50 μg/ml does not induce platelet aggregation or the release reaction. When [Ca²⁺]_c is decreased by addition of citrate to hirudin-PRP or when no CaCl₂ is added to washed platelet suspensions, ASvWf does induce platelet aggregation and the release reaction. In low [Ca²⁺]₀, ASvWf interacts with platelet GPIb to cause primary aggregation of disc-shaped platelets to each other through GPIIb/IIIa, with or without added fibrinogen. This primary platelet aggregation leads to thromboxane A₂ formation and secondary aggregation and the release reaction. With [Ca²⁺]₀ in the physiological range, there is less ASvWf interaction with GPIb, no primary platelet aggregation and no thromboxane A₂ formation. The ASvWf-platelet interaction at physiological [Ca²⁺]₀, however, enhances the platelet response to collagen or epinephrine.

Keywords

Asialo von Willebrand factor - External ionized calcium - Platelet aggregation - Platelet glycoproteins lb and Ilb/IIIa - Arachidonate pathway

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