期刊
BLOOD
卷 112, 期 8, 页码 3227-3233出版社
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2008-02-139113
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资金
- The Netherlands Organisation for Scientific Research [VENI 916.56.076]
Several lines of evidence suggest that recombinant factor VIIa (rFVIIa) is able to activate factor X on an activated platelet, in a tissue factor-independent manner. We hypothesized that, besides the anionic surface, a receptor on the activated platelet surface is involved in this process. Here, we showed that, in an ELISA setup, a purified extracellular fragment of GPIb alpha bound to immobilized rFVIIa. Surface plasmon resonance established a affinity constant (K-d) of approximately 20 nM for this interaction. In addition, CHO cells transfected with the GPIb-IX-V complex could adhere to immobilized rFVIIa, whereas wild-type CHO cells could not. Furthermore, platelets stimulated with a combination of collagen and thrombin adhered to immobilized rFVIIa under static conditions. Platelet adhesion was inhibited by treatment with O-sialoglycoprotein endopeptidase, which specifically cleaves GPIb alpha from the platelet surface. In addition, rFVIIa-mediated thrombin generation on the activated platelet surface was inhibited by cleaving GPIb alpha from its surface. In summary, 3 lines of evidence showed that rFVIIa interacts with the GPIb-IX-V complex, and this interaction enhanced tissue factor-independent thrombin generation mediated by rFVIIa on the activated platelet surface. The rFVIIa-GPIb alpha interaction could contribute to cessation of bleeding after administration of rFVIIa to patients with bleeding disorders.
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