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Related Experiment Videos

Antithrombin activity of intact human platelets.

K Watanabe, F C Chao, J L Tullis

    Thrombosis Et Diathesis Haemorrhagica
    |September 30, 1975
    PubMed
    Summary
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    Human platelets exhibit significant antithrombin activity, distinct from plasma factors. This platelet-derived antithrombin rapidly neutralizes thrombin, suggesting a unique role in hemostasis.

    Area of Science:

    • Hematology
    • Biochemistry
    • Hemostasis

    Background:

    • Antithrombin activity is crucial for regulating blood coagulation.
    • Plasma antithrombin III and alpha2-macroglobulin are known inhibitors of thrombin.
    • The role of platelets in antithrombin activity has not been fully elucidated.

    Purpose of the Study:

    • To investigate the presence and characteristics of antithrombin activity in human platelets.
    • To differentiate platelet antithrombin from known plasma antithrombins.

    Main Methods:

    • Washed human platelets were incubated with thrombin.
    • Platelet antithrombin activity was assessed after various treatments (washing, antibodies, enzymes, heat).
    • Reaction kinetics with thrombin were compared to plasma antithrombins.

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    Main Results:

    • Intact human platelets demonstrated significant antithrombin activity.
    • This activity was resistant to washing and antibodies against plasma inhibitors but sensitive to enzymatic and heat treatments.
    • Platelet antithrombin exhibited rapid thrombin inhibition kinetics, distinct from plasma antithrombin III and fibrinogen.

    Conclusions:

    • Human platelets possess a specific, intrinsic antithrombin.
    • This platelet antithrombin differs in characteristics and kinetics from plasma antithrombin III and fibrinogen.
    • Platelets may play a direct role in modulating thrombin activity during hemostasis.