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Related Experiment Videos

Your bleeding heart: lessons from low tissue factor expression in mice.

John H McVey1

  • 1Haemostasis and Thrombosis, MRC Clinical Sciences Centre, The Faculty of Medicine, Imperial College, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK. john.mcvey@csc.mrc.ac.uk

Trends in Pharmacological Sciences
|June 26, 2003
PubMed
Summary

Tissue factor (TF) and factor VII (FVII) are crucial for blood clotting and maintaining heart hemostasis. Low TF levels in mice led to minor cardiac bleeds, likely from vessel injury.

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Area of Science:

  • Cardiovascular Biology
  • Hemostasis and Thrombosis
  • Coagulation Cascade

Background:

  • Tissue factor (TF) acts as the cellular receptor and cofactor for blood coagulation factor VII (FVII).
  • TF initiates the blood coagulation cascade upon exposure to flowing blood.
  • Adequate hemostasis is vital for maintaining cardiac function.

Purpose of the Study:

  • To investigate the role of tissue factor (TF) and factor VII (FVII) in cardiac hemostasis.
  • To explore the consequences of reduced TF levels on the heart's blood vessels.

Main Methods:

  • Utilized a mouse model with genetically modified low expression of tissue factor (TF).
  • Observed and analyzed cardiac hemostasis and microvasculature integrity in the experimental mice.

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Main Results:

  • Mice with low TF levels exhibited compromised hemostasis within the heart.
  • Evidence suggests the heart is susceptible to recurrent micro-bleeding events.
  • These bleeds are hypothesized to stem from repetitive mechanical injuries to cardiac blood vessels.

Conclusions:

  • TF and FVII play a critical role in maintaining cardiac hemostasis.
  • Reduced TF levels can predispose the heart to bleeding complications.
  • Repetitive mechanical stress on blood vessels may contribute to cardiac bleeds in TF-deficient states.