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  • Title: Monoclonal antibodies against platelet membrane glycoproteins IIb/IIIa and Ibalpha inhibit platelet dependent thrombin generation by different mechanisms.
    Author: Thomas S, Metcalfe P, Goodall AH, Gray E.
    Journal: Thromb Haemost; 2000 Jul; 84(1):98-103. PubMed ID: 10928478.
    Abstract:
    The antithrombotic effect of antiplatelet agents is principally due to their anti-aggregatory action, but these agents may also interfere with coagulation. We have investigated the effect of monoclonal antibodies (MAb) to platelet membrane glycoproteins (GP) IIb/IIIa and Ibalpha on thrombin generation. Antibodies to platelet membrane glycoprotein IIb/IIIa (RFGP56 and c7E3) were shown to inhibit platelet-mediated thrombin generation stimulated by both intrinsic and extrinsic methods. An antibody to GP Ibalpha (RFGP37) also inhibited thrombin generation in these systems. FITC-annexin V was used to determine the effect of these antibodies on the exposure of procoagulant phospholipids on the platelet membrane, and it was found that the anti-IIb/IIIa antibodies reduced this, whereas the anti-Ibalpha antibody caused an increase. We conclude that our monoclonal antibodies against platelet membrane glycoproteins IIb/IIIa and Ibalpha inhibit platelet dependent thrombin generation by different mechanisms.
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