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Peroxynitrite inactivates tissue plasminogen activator.

Vance G Nielsen1, John P Crow, Fen Zhou

  • 1Department of Anesthesiology, The Center for Free Radical Biology, The University of Alabama at Birmingham, Birmingham, Alabama 35249-6810, USA. vance.nielsen@ccc.uab.edu

Anesthesia and Analgesia
|April 24, 2004
PubMed
Summary

Peroxynitrite significantly reduces the activity of tissue plasminogen activator (tPA), a key enzyme in blood clot breakdown. This finding suggests peroxynitrite may contribute to thrombosis in certain clinical conditions.

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Area of Science:

  • Biochemistry
  • Physiology
  • Molecular Biology

Background:

  • Tissue plasminogen activator (tPA) is crucial for fibrinolysis, the breakdown of blood clots.
  • Thrombosis is linked to reduced tPA activity and increased reactive nitrogen species like peroxynitrite (OONO(-)).

Purpose of the Study:

  • To investigate the hypothesis that peroxynitrite (OONO(-)) inhibits tPA activity.
  • To explore the potential role of peroxynitrite in clinical thrombotic events.

Main Methods:

  • Recombinant tPA was exposed to varying concentrations of 3-morpholinosydnonimine (SIN-1) to generate peroxynitrite (OONO(-)).
  • Superoxide dismutase was used to control for superoxide effects.
  • tPA activity was measured by assessing its ability to promote fibrinolysis in human plasma using thrombelastography.

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Main Results:

  • Exposure to SIN-1, which generates peroxynitrite, led to a significant decrease in tPA-mediated fibrinolysis (less than 1% of control activity).
  • This inhibition was statistically significant (P < 0.001) compared to control conditions.
  • No significant differences in tPA activity were observed between control groups without SIN-1.

Conclusions:

  • Peroxynitrite effectively inhibits the fibrinolytic activity of tissue plasminogen activator (tPA).
  • Peroxynitrite-mediated inactivation of tPA may play a role in the development or progression of thrombotic states.