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Related Experiment Videos

The antithrombotic factor singlet oxygen/light (1O2/h nu).

T W Stief1, J Fareed

  • 1Department of Clinical Chemistry, Philipps University, Marburg, Germany.

Clinical and Applied Thrombosis/Hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
|March 22, 2000
PubMed
Summary

Singlet oxygen (1O2), generated by activated phagocytes, inhibits blood clotting and promotes clot breakdown. This cellular mechanism may offer new therapeutic strategies for preventing atherothrombosis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Activated phagocytes, particularly polymorphonuclear granulocytes (PMNs), produce oxidants like singlet oxygen (1O2) via the respiratory burst.
  • Singlet oxygen (1O2) is a reactive oxygen species involved in various physiological processes.

Purpose of the Study:

  • To investigate the in vitro and in vivo effects of singlet oxygen (1O2) on coagulation and fibrinolysis.
  • To explore the potential role of 1O2 in atherothrombosis and its therapeutic implications.

Main Methods:

  • In vitro experiments assessing 1O2 effects on coagulation factors and fibrinolysis inhibitors.
  • In vivo studies evaluating 1O2-induced thrombolysis.

Main Results:

Related Experiment Videos

  • Singlet oxygen (1O2) was found to inhibit coagulation by inactivating platelets and clotting factors (fibrinogen, V, VIII, X).
  • 1O2 activates fibrinolysis by inactivating inhibitors (PAI-1, alpha-2-antiplasmin) and activating single-chain urokinase.
  • In vivo, 1O2 induced selective thrombolysis without altering systemic hemostasis.

    • Conclusions:

    • Activated PMNs modulate hemostasis towards an antithrombotic state through 1O2 generation.
    • Impaired PMN function is linked to thrombotic complications.
    • 1O2-mediated signaling presents a novel physiological principle for pharmacologic intervention in atherothrombosis.