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Related Experiment Videos

Biological control of factor VII

Y Nemerson

    Thrombosis and Haemostasis
    |February 29, 1976
    PubMed
    Summary

    The tissue factor pathway, initiated by factor VII, involves factor X activation and feedback loops. Activated factor X can both enhance and inactivate factor VII, linking to the intrinsic system.

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    Area of Science:

    • Biochemistry
    • Hematology
    • Molecular Biology

    Background:

    • The tissue factor pathway is a primary initiator of blood coagulation.
    • Factor VII plays a crucial role in initiating this pathway.
    • The interplay between activated factors and pathway components is complex.

    Purpose of the Study:

    • To elucidate the regulatory mechanisms within the tissue factor pathway.
    • To investigate the feedback interactions between activated factor X and factor VII.
    • To explore the connection between the tissue factor pathway and the intrinsic coagulation system.

    Main Methods:

    • Enzymatic assays to measure proteolytic activity.
    • Analysis of factor cleavage sites and resulting molecular forms.
    • Investigation of cofactor requirements (calcium, phospholipids).

    Main Results:

    • Factor VII cleaves factor X, initiating coagulation.
    • Activated factor X reciprocally activates factor VII (60-fold increase in activity).
    • Activated factor X also inactivates factor VII, forming a three-chain molecule.
    • Activated factor X activates factor IX, linking the extrinsic and intrinsic pathways.

    Conclusions:

    • The tissue factor pathway exhibits complex auto-activation and inactivation feedback loops involving factor VII.
    • Activated factor X serves as a key link, activating both factor VII and factor IX.
    • This highlights a significant cross-talk between the extrinsic (tissue factor) and intrinsic coagulation systems.

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