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A cell-based model of thrombin generation.

Harold R Roberts1, Maureane Hoffman, Dougald M Monroe

  • 1School of Medicine, Division of Hematology/Oncology, Carolina Cardiovascular Biology Center, University of North Carolina, Chapel Hill, North Carolina 27599-7035, USA. hrr@med.unc.edu

Seminars in Thrombosis and Hemostasis
|May 5, 2006
PubMed
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This study presents a novel cell-based model for thrombin generation, utilizing activated monocytes and platelets to mimic physiological coagulation processes and investigate key enzyme activations.

Area of Science:

  • Hematology
  • Biochemistry
  • Cell Biology

Background:

  • Thrombin generation is a critical process in hemostasis.
  • Existing models often lack the complexity of in vivo cellular interactions.
  • Activated monocytes and platelets play crucial roles in coagulation.

Purpose of the Study:

  • To develop and validate a cell-based model of thrombin generation.
  • To investigate the roles of activated monocytes and platelets in coagulation.
  • To analyze the activation of key coagulation factors within this model.

Main Methods:

  • Utilized lipopolysaccharide-activated monocytes expressing tissue factor (TF).
  • Incorporated plasma concentrations of procoagulants and inhibitors.
  • Initiated coagulation with factor VIIa (FVIIa) and calcium in microtiter wells.

Related Experiment Videos

  • Measured thrombin generation, platelet activation (P-selectin), and coagulation factor activation (FIX, FX, FVIII, FV, FXI).

    • Main Results:

    • FVIIa-TF interaction activated FX and FIX.
    • Initial thrombin generation occurred on TF-bearing monocytes, activating platelets and factors V, VIII, and XI.
    • Activated platelets served as a surface for subsequent FXa generation and amplified thrombin production.
    • Activated protein C inactivated factor Va on endothelial cells, not platelets.

    Conclusions:

    • The developed model accurately reflects key aspects of physiological thrombin generation.
    • Platelet activation is crucial for amplifying thrombin generation initiated by TF-bearing monocytes.
    • This model provides a platform for studying coagulation factor interactions and inhibitor effects.