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Related Experiment Videos

Two separable steps in the development of platelet prothrombin-converting activity.

A C Cox, B N White, E Larsen

    Thrombosis Research
    |November 15, 1985
    PubMed
    Summary

    Platelets enhance thrombin generation via Factor Va binding. This process involves developing high-affinity binding sites and an ATP-dependent step, crucial for efficient blood coagulation.

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    Area of Science:

    • Biochemistry
    • Hematology

    Background:

    • Platelets play a critical role in hemostasis by catalyzing the conversion of prothrombin to thrombin.
    • Coagulation Factors Va and Xa are essential cofactors in this process.

    Purpose of the Study:

    • To investigate the binding of Factor Va to platelets and its effect on thrombin generation.
    • To elucidate the mechanisms underlying platelet-mediated prothrombin activation.

    Main Methods:

    • Washing human and bovine platelets using centrifugal pelleting and gel filtration.
    • Assessing Factor Va binding affinities and capacities.
    • Measuring thrombin production rates.
    • Evaluating the impact of dinitrophenol on platelet activity and ATP levels.

    Main Results:

    Related Experiment Videos

    • Centrifugal pelleting significantly increased the number or affinity of Factor Va binding sites on platelets.
    • Thrombin production exhibited a lag phase followed by a rapid rate, dependent on developed binding sites.
    • Dinitrophenol impaired thrombin production by reducing ATP levels but did not affect Factor Va binding.

    Conclusions:

    • Platelet prothrombin-converting activity activation involves two distinct steps: development of high-affinity Factor Va binding sites and an ATP-dependent step.
    • Platelet preparation methods influence Factor Va binding and subsequent prothrombin activation efficiency.