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- W2000425963 abstract "The effects of YM337, the Fab fragment of a humanized anti-glycoprotein IIb/IIIa (GPIIb/IIIa) monoclonal antibody C4G1, on in vitro platelet function and binding properties were compared with those of abciximab, the Fab fragment of the human/murine chimeric anti-GPIIb/IIIa monoclonal antibody 7E3. Both agents completely inhibited platelet aggregation caused by all agonists tested except ristocetin. Further, both inhibited human platelet adhesion to von Willebrand factor, fibrinogen, fibronectin and subendothelial matrix with similar potency. Fibrinogen binding to washed platelets was dose-dependently inhibited by both agents. In binding assay using 125I-YM337 and 125I-abciximab, Kd values determined with platelet-rich plasma were 6.74 +/- 0.56 nM for YM337 and 6.65 +/- 1.45 nM for abciximab, and the number of binding sites were 42,700 +/- 3,000 for YM337 and 76,000 +/- 5,400 for abciximab. GPIIb/IIIa was precipitated from the solubilized fraction of platelets by both agents. In contrast, integrin alphavbeta3 was precipitated from the solubilized fraction of human umbilical vein endothelial cells by abciximab but not by YM337. Fibrinogen binding to purified GPIIb/IIIa was dose-dependently inhibited by both agents. In contrast, vitronectin binding to purified integrin alphavbeta3 was dose-dependently inhibited by abciximab but not by YM337, supporting the idea that abciximab reacts to integrin alphavbeta3. Therefore, YM337 was suggested to bind to a different epitope of GPIIb/IIIa from abciximab. These results suggest that YM337 specifically acts on platelet GPIIb/IIIa receptors and has similar inhibitory properties on platelet aggregation and platelet adhesion to abciximab." @default.
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- W2000425963 date "2002-01-01" @default.
- W2000425963 modified "2023-10-14" @default.
- W2000425963 title "Comparative Studies of a Humanized Anti-glycoprotein IIb/IIIa Monoclonal Antibody, YM337, and Abciximab on in Vitro Antiplatelet Effect and Binding Properties." @default.
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- W2000425963 doi "https://doi.org/10.1248/bpb.25.1006" @default.
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