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Related Experiment Videos

Tissue factor pathway inhibitor does not influence inflammatory pathways during human endotoxemia.

E de Jonge1, P E Dekkers, A A Creasey

  • 1Department of Intensive Care, Academic Medical Center, University of Amsterdam, 1100 DD Amsterdam, The Netherlands. E.dejonge@amc.uva.nl

The Journal of Infectious Diseases
|May 24, 2001
PubMed
Summary

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Tissue factor pathway inhibitor (TFPI) completely blocked endotoxin-induced coagulation activation in humans. However, TFPI did not affect inflammatory responses, suggesting coagulation is not essential for endotoxemia-induced inflammation.

Area of Science:

  • Hematology
  • Immunology
  • Pharmacology

Background:

  • Coagulation activation triggers proinflammatory responses, as shown in vitro and animal models.
  • Inhibiting the tissue factor pathway of coagulation reduces cytokine release and mortality in sepsis models.
  • The role of coagulation in human inflammatory responses requires further investigation.

Purpose of the Study:

  • To investigate the effect of tissue factor pathway inhibitor (TFPI) on endotoxin-induced inflammatory responses in healthy humans.
  • To determine if blocking coagulation activation influences key inflammatory markers.

Main Methods:

  • A double-blind, randomized, placebo-controlled crossover study involving eight healthy men.
  • Participants received an endotoxin injection followed by continuous infusion of either TFPI or placebo.

Related Experiment Videos

  • Coagulation activation, leukocyte activation, chemokine release, endothelial cell activation, and acute phase response were measured.

    • Main Results:

    • TFPI completely prevented endotoxin-induced coagulation activation.
    • TFPI administration did not alter leukocyte activation, chemokine release, or endothelial cell activation.
    • The acute phase response remained unaffected by TFPI treatment.

    Conclusions:

    • Complete inhibition of coagulation activation via TFPI does not modulate inflammatory pathway activation during human endotoxemia.
    • These findings suggest that the coagulation system may not be a primary driver of endotoxin-induced inflammation in humans.