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Related Experiment Videos

Complement proteins C5b-9 stimulate procoagulant activity through platelet prothrombinase.

T Wiedmer, C T Esmon, P J Sims

    Blood
    |October 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Complement component 5b-9 (C5b-9) proteins significantly enhance platelet prothrombinase activity, accelerating clot formation. This immune complex potentiates thrombin generation and plasma clotting, even without added cofactors.

    Area of Science:

    • Immunology
    • Hematology
    • Biochemistry

    Background:

    • Platelets play a crucial role in hemostasis and thrombosis.
    • The complement system, particularly the membrane attack complex (MAC) C5b-9, can interact with cells, including platelets.
    • Understanding C5b-9's effect on platelet function is vital for comprehending immune-mediated thrombotic events.

    Purpose of the Study:

    • To investigate the procoagulant capacity of platelets treated with non-lytic concentrations of C5b-9 proteins.
    • To determine how C5b-9 assembly on platelets affects prothrombin activation and thrombin generation.
    • To compare C5b-9-induced platelet activation with other known platelet stimuli.

    Main Methods:

    • Gel-filtered platelets were treated with purified C5b-9 proteins at non-lytic concentrations.

    Related Experiment Videos

  • Prothrombin activation and thrombin generation were measured in the presence and absence of exogenous factors Xa and Va.
  • Platelet prothrombinase activity was assessed and compared to thrombin-stimulated platelets and calcium ionophore A23187.
  • Platelet-catalyzed plasma clotting rates were measured.

    • Main Results:

    • C5b-9 treated platelets catalyzed prothrombin to thrombin conversion at rates up to tenfold higher than controls when supplemented with factors Xa and Va.
    • In the absence of factor Va, C5b-9 assembly shortened the lag phase and increased the maximum rate of prothrombinase expression.
    • C5b-9-induced prothrombinase activation paralleled that of calcium ionophore A23187.
    • Membrane assembly of C5b-9 markedly accelerated platelet-catalyzed plasma clotting.

    Conclusions:

    • C5b-9 proteins potentiate platelet prothrombinase activity by promoting factor V release and prothrombinase complex assembly.
    • This C5b-9-mediated activation of platelet prothrombinase directly links to increased procoagulant activity and plasma clotting.
    • The findings suggest a role for C5b-9 in immune-mediated platelet activation and thrombosis.