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Related Experiment Videos

Platelets and surface-mediated clotting activity.

W J Vicic, O D Ratnoff, H Saito

    British Journal of Haematology
    |September 1, 1979
    PubMed
    Summary

    This study found no evidence that platelets activate Hageman factor (factor XII), even after incubation with adenosine diphosphate (ADP). These findings contradict previous research on platelet-mediated coagulation initiation.

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    Area of Science:

    • Hematology
    • Coagulation Cascade
    • Platelet Biology

    Background:

    • The Hageman factor (factor XII) plays a crucial role in initiating the intrinsic pathway of the coagulation cascade.
    • Platelets are known to participate in hemostasis and thrombosis, and their role in activating factor XII has been previously suggested.
    • Adenosine diphosphate (ADP) is a key platelet agonist that promotes platelet activation and aggregation.

    Purpose of the Study:

    • To investigate whether platelets can activate Hageman factor (factor XII).
    • To determine if adenosine diphosphate (ADP) influences the potential activation of factor XII by platelets.

    Main Methods:

    • Incubation of platelets with and without adenosine diphosphate (ADP).
    • Assay for the activation of Hageman factor (factor XII) in the presence of platelets.

    Main Results:

    • No evidence of Hageman factor (factor XII) activation was observed when platelets were incubated with or without adenosine diphosphate (ADP).
    • The results did not support the hypothesis that platelets directly activate factor XII.

    Conclusions:

    • Platelets do not appear to activate Hageman factor (factor XII) under the conditions tested.
    • This study challenges previous findings regarding the role of platelets in initiating the intrinsic coagulation pathway via factor XII activation.

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