von Willebrand factor mediates platelet spreading through glycoprotein Ib and alphaIIbbeta3 in the presence of botrocetin and ristocetin, respectively
نویسندگان
چکیده
منابع مشابه
Characterization of murine anti-glycoprotein Ib monoclonal antibodies that differentiate between shear-induced and ristocetin/botrocetin-induced glycoprotein Ib-von Willebrand factor interaction.
Platelet adhesion to vascular subendothelium under conditions of high shear stress is mediated by the platelet glycoprotein (GP) Ib-von Willebrand Factor (vWF) interaction. The aim of this study was to characterize the murine monoclonal antibodies (MoAbs) 27A10 and 28E6, both raised against purified GPIb. The MoAb 27A10 is a potent inhibitor of shear-induced platelet adhesion to collagen type I...
متن کاملThrombin decreases von Willebrand factor binding to platelet glycoprotein Ib.
Thrombin is a physiological agonist that promotes platelet aggregation and secretion. In this study we observed that thrombin can also inhibit a function of platelets related to primary hemostasis. Platelet stimulation by thrombin decreased the binding of von Willebrand factor (vWF) to glycoprotein (GP) Ib and decreased ristocetin-induced agglutination, in vitro reactions that correlate with in...
متن کاملIdentification of discontinuous von Willebrand factor sequences involved in complex formation with botrocetin. A model for the regulation of von Willebrand factor binding to platelet glycoprotein Ib.
We have used proteolytic fragments and overlapping synthetic peptides to define the domain of von Willebrand factor (vWF) that forms a complex with botrocetin and modulates binding to platelet glycoprotein (GP) Ib. Both functions were inhibited by the dimeric 116-kDa tryptic fragment and by its constituent 52/48-kDa subunit, comprising residues 449-728 of mature vWF, but not by the dimeric frag...
متن کاملPlasmin effect on platelet glycoprotein Ib-von Willebrand factor interactions.
We have studied the effect of streptokinase on platelets in platelet-rich plasma (PRP) and of plasmin on washed platelets. By three and one-half minutes after the addition of 50,000 IU/mL streptokinase to PRP, the maximum rate of ristocetin-induced platelet agglutination declined 40%, and by 60 minutes, it declined 70%. During the same time interval, the thrombin time increased from 20 seconds ...
متن کاملLocalization of von willebrand factor-binding sites for platelet glycoprotein Ib and botrocetin by charged-to-alanine scanning mutagenesis.
At sites of vascular injury, von Willebrand factor (VWF) mediates platelet adhesion through binding to platelet glycoprotein Ib (GPIb). Previous studies identified clusters of charged residues within VWF domain A1 that were involved in binding GPIb or botrocetin. The contribution of 28 specific residues within these clusters was analyzed by mutating single amino acids to alanine. Binding to a p...
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ژورنال
عنوان ژورنال: Journal of Thrombosis and Haemostasis
سال: 2006
ISSN: 1538-7933,1538-7836
DOI: 10.1111/j.1538-7836.2006.01966.x