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Platelet membrane involvement in blood coagulation.

H C Hemker, J L van Rijn, J Rosing

    Blood Cells
    |January 1, 1983
    PubMed
    Summary

    Intact platelets expose procoagulant phospholipids via membrane flip-flop, a process triggered by collagen and thrombin. This mechanism is crucial for blood coagulation factor activation.

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    [Measuring thrombin formation].

    Nederlands tijdschrift voor geneeskunde·2016

    Area of Science:

    • Biochemistry
    • Hematology
    • Cell Biology

    Background:

    • Platelets are essential for hemostasis and thrombosis.
    • Procoagulant phospholipids, primarily phosphatidylserine, are normally sequestered on the inner leaflet of the platelet plasma membrane.
    • Externalization of these phospholipids is a key event in initiating the coagulation cascade.

    Purpose of the Study:

    • To elucidate the mechanism by which intact platelets become procoagulant.
    • To identify the triggers for the translocation of procoagulant phospholipids.
    • To understand the role of this process in the assembly of coagulation factor complexes.

    Main Methods:

    • Investigated platelet membrane dynamics and phospholipid distribution.
    • Utilized stimuli such as collagen and thrombin to induce procoagulant activity.
    • Examined the binding of coagulation factors IXa, VIIIa, Xa, and Va to activated platelets.

    Main Results:

    • Identified a platelet-specific mechanism termed 'membrane flip-flop' for phospholipid externalization.
    • Demonstrated that the simultaneous presence of collagen and thrombin triggers this membrane flip-flop.
    • Showed that externalized phospholipids serve as binding sites for coagulation factors IXa/VIIIa and Xa/Va, forming key enzyme complexes.

    Conclusions:

    • Platelet membrane flip-flop is a critical pathway for exposing procoagulant phospholipids in intact platelets.
    • This phospholipid externalization, triggered by collagen and thrombin, is essential for efficient thrombin generation.
    • The study clarifies a fundamental mechanism in hemostasis, linking platelet activation to the coagulation cascade.

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