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Analysis of the Involvement of the von Willebrand Factor-Glycoprotein Ib Interaction in Platelet Adhesion to a Collagen-Coated Surface Under Flow Conditions
Masaaki Moroi,
Stephanie M. Jung,
Shosaku Nomura,
Sadayoshi Sekiguchi,
Antonio Ordinas, and
Maribel Diaz-Ricart
From the Department of Protein Biochemistry, Institute of Life Science, Kurume University, Kurume; First Department of Internal Medicine, Kansai Medical University, Moriguchi, Osaka; Hokkaido Red Cross Blood Center, Sapporo, Hokkaido, Japan; and Servicio de Hemoterapia-Hemostasia, Hospital Clinic i Provincial, Facultad de Medicina, Universidad de Barcelona, Barcelona, Spain.
The requisite initial reaction for in vivo thrombus formation in flowing blood is platelet adhesion to the exposed surface of the extracellular matrix. The contribution of von Willebrand factor (vWF ) in plasma and glycoprotein (GP) Ib on the platelet membrane to platelet adhesion has been well-documented. We have recently developed a procedure (the "flow adhesion assay") for measuring platelet adhesion under flow conditions that allowed us to characterize platelet adhesion to a collagen-coated surface. Here, we apply our method to analyze platelet adhesion to a vWF-coated surface to determine how this might differ from adhesion to a collagen-coated surface. Platelet adhesion to the vWF-coated surface was monitored as the linear increase in the area occupied by adherent platelets. The fluorescence image showed that platelets adhering to the vWF surface were mainly single platelets, and if any were present, the platelet aggregates were small, this being the primary difference from the adhesion to a collagen surface, where adherent platelets were mostly in aggregates. The flow adhesion assay detected the movement of platelets on the vWF surface, suggesting the reversible binding of vWF with platelets. The velocity of the platelets increased at higher shear rates or at lower vWF densities on the surface. Treatment of the vWF-coated surface with the aggregating agent botrocetin before initiation of blood flow increased platelet adhesion while dramatically decreasing the velocity of platelet movement. The present observations on the adhesion of platelets to the vWF-pretreated collagen surface and measurements of the velocity of platelets moving on the collagen surface suggest that the first interaction on the collagen-coated surface is the binding of vWF molecules to the collagen surface. This small number of vWF molecules would serve to attract and slow platelets flowing near the surface. This would facilitate the actual adhesion to the collagen surface that is mainly generated by the interaction between platelet collagen receptors, including GP Ia/IIa and GP VI, with collagen.
Blood, Vol. 90 No. 11 (December 1), 1997:
pp. 4413-4424
© 1997 by The American Society of Hematology.

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