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Related Experiment Videos

Factor V: Dr. Jeckyll and Mr. Hyde.

M Kalafatis1, K G Mann

  • 1Department of Chemistry, Cleveland State University, OH 44115, USA. m.kalafatis@csuohio.edu

Advances in Experimental Medicine and Biology
|September 14, 2001
PubMed
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Maintaining blood clotting balance is vital. Activated protein C (APC) inactivates factor Va, preventing excessive clotting. Defects in this process increase thrombotic risk.

Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Hemostasis relies on a balance between procoagulant and anticoagulant pathways.
  • Key procoagulant complexes involve enzymes, cofactors (like Factor Va and Factor VIIIa), and substrates on cell surfaces.
  • Cofactors like Factor Va are crucial for enzymatic complex function and are derived from plasma precursors via proteolysis.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing the balance between blood coagulation and anticoagulation.
  • To understand the role of Factor Va inactivation by activated protein C (APC) in preventing thrombotic events.
  • To investigate the implications of dysregulated Factor Va inactivation on thrombotic risk.

Main Methods:

  • The study focuses on the molecular mechanisms of coagulation complex formation and regulation.

Related Experiment Videos

  • It examines the interaction between alpha-thrombin, thrombomodulin, and the protein C pathway.
  • Analysis involves understanding the specific cleavage events by APC on Factor Va.

    • Main Results:

    • Factor Va and Factor VIIIa act as essential cofactors in prothrombinase and intrinsic tenase complexes, respectively.
    • Alpha-thrombin initiates its own downregulation via the protein C pathway, generating APC.
    • APC inactivates Factor Va by cleaving specific sites, leading to prothrombinase complex dissociation.

    Conclusions:

    • Proper functioning of the protein C pathway and APC-mediated Factor Va inactivation are critical for preventing thrombosis.
    • Defects in Factor Va inactivation by APC are linked to an increased risk of thrombotic events.
    • Maintaining the delicate balance of hemostasis is essential for survival, with dysregulation leading to bleeding or clotting disorders.