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DOI: 10.1055/s-0038-1647045
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
Publikationsverlauf
Received 11. März 1988
Accepted after revision 22. Juni 1988
Publikationsdatum:
28. Juni 2018 (online)
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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.
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