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Related Experiment Videos

Singlet oxygen potentiates thrombolysis.

Thomas W Stief1

  • 1Department of Clinical Chemistry, University of Giessen & Marburg, Germany. thstief@med.uni

Clinical and Applied Thrombosis/Hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
|July 20, 2007
PubMed
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Activated polymorphonuclear neutrophils (PMN) enhance clot lysis by producing urokinase (u-PA) and oxidants. This study demonstrates that u-PA and singlet oxygen significantly accelerate thrombolysis, mimicking natural clot breakdown processes.

Area of Science:

  • Biochemistry
  • Hematology
  • Cellular Biology

Background:

  • Polymorphonuclear neutrophils (PMN) are key players in physiological thrombolysis.
  • PMN generate urokinase (u-PA) and oxidants, including singlet oxygen ((1)O(2)).
  • The combined action of u-PA and (1)O(2) is crucial for effective clot breakdown.

Purpose of the Study:

  • To investigate the in vitro thrombolytic effects of urokinase (u-PA) in conjunction with oxidants.
  • To quantify the synergistic effect of u-PA and singlet oxygen on clot lysis.
  • To develop an assay that mimics the u-PA/(1)O(2)-mediated thrombolysis by PMN.

Main Methods:

  • Microclots of normal human plasma were oxidized using chloramine-T.
  • Varying concentrations of urokinase (u-PA) and tissue plasminogen activator (t-PA) were added to oxidized and unoxidized clots.

Related Experiment Videos

  • Clot turbidity was measured over time to determine lysis rates and effective doses (ED(50), ED(25)).

    • Main Results:

    • Oxidation of microclots significantly enhanced thrombolysis mediated by u-PA, up to approximately 20-fold.
    • A 20-fold increase in thrombolysis was observed with 1.25 micromoles of chloramine per 100 microL of clot.
    • 25% clot lysis was achieved in 50 minutes with u-PA in oxidized clots, compared to approximately 5 hours in unoxidized clots.

    Conclusions:

    • The study successfully imitated u-PA/(1)O(2)-mediated thrombolysis in vitro.
    • Oxidation significantly potentiates the thrombolytic activity of u-PA.
    • This model provides insights into the mechanisms of PMN-driven physiological thrombolysis.