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Related Experiment Videos

Factor V: a platelet cytoskeletal associated protein.

G P Tuszynski, P N Walsh

    Haematologia
    |January 1, 1984
    PubMed
    Summary

    Platelet cytoskeletons bind Factor Va via surface receptors. This binding is crucial for platelet function and requires intact Factor Va and its binding sites on the platelet surface.

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    Do platelets synthesize factor XI?

    Journal of thrombosis and haemostasis : JTH·2004

    Area of Science:

    • Hematology
    • Cell Biology
    • Biochemistry

    Background:

    • Platelets play a critical role in hemostasis and thrombosis.
    • Factor Va is a key cofactor in the coagulation cascade, essential for thrombin generation.
    • The interaction between coagulation factors and the platelet cytoskeleton is not fully understood.

    Purpose of the Study:

    • To investigate the association of Factor Va with the platelet cytoskeleton.
    • To determine the mechanism by which Factor Va binds to the platelet cytoskeleton.
    • To explore the role of platelet surface receptors in Factor Va cytoskeletal association.

    Main Methods:

    • Preparation of platelet cytoskeletons from thrombin-activated platelets.
    • Assessment of Factor Va activity and binding in cytoskeletal preparations.
    • Utilized reagents like EDTA and proteolytic enzymes to probe Factor Va inactivation.
    • Examined cytoskeletons from platelets with varying Factor Va binding site availability.

    Main Results:

    • Factor Va is specifically associated with platelet cytoskeletons after thrombin activation.
    • Factor Va association with the cytoskeleton requires prior secretion and intact surface binding sites.
    • Platelet Factor Xa binding sites (Factor Va) are quantitatively retained on the cytoskeleton.

    Conclusions:

    • Factor Va associates with the platelet cytoskeleton, likely through surface receptors.
    • This association is dependent on the integrity of Factor Va and its platelet binding sites.
    • The platelet cytoskeleton serves as a reservoir for functionally active Factor Va.

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