Carbon monoxide-releasing molecule-2 decreases fibrinolysis in human plasma

Vance G. Nielsen, James K. Kirklin, James F. George

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Carbon monoxide, derived from carbon monoxide-releasing molecules, has been recently demonstrated to enhance the velocity of formation and strength of plasma thrombi. We tested the hypothesis that carbon monoxide-releasing molecule-2 would modulate fibrinolysis of plasma thrombi. Normal plasma was exposed to 0, 25, 50, 100 or 200 μmol/l carbon monoxide-releasing molecule-2, with coagulation activated with tissue factor and fibrinolysis initiated with tissue-type plasminogen activator. Additional experiments utilized factor XIII, plasminogen activator inhibitor-1, thrombin activatable fibrinolysis inhibitor or α2-antiplasmin-deficient plasmas. Thrombus growth/disintegration kinetics was monitored with thrombelastography. Carbon monoxide-releasing molecule-2, in a concentration-dependent fashion, increased the velocity of thrombus formation and strength, and markedly attenuated fibrinolysis in normal plasma. In factor XIII-deficient plasma, carbon monoxide-releasing molecule-2 mediated effects on thrombus growth/disintegration kinetics were similar to that seen with normal plasma; however, carbon monoxide-releasing molecule-2 had a less marked effect on thrombus growth/disintegration in both plasminogen activator inhibitor-1 and thrombin activatable fibrinolysis inhibitor-deficient plasma, with even less carbon monoxide-releasing molecule-2-mediated effects noted in α2-antiplasmin-deficient plasma. Carbon monoxide-releasing molecule-2 attenuated fibrinolysis by enhancing the velocity of clot growth and strength while augmenting the effects of plasminogen activator inhibitor-1, thrombin activatable fibrinolysis inhibitor and α2-antiplasmin. These findings serve as the rationale for further investigations to determine if carbon monoxide-releasing molecules could be utilized as hemostatic agents.

Original languageEnglish (US)
Pages (from-to)448-455
Number of pages8
JournalBlood Coagulation and Fibrinolysis
Issue number6
StatePublished - Sep 2009


  • Carbon monoxide
  • Carbon monoxide-releasing molecule
  • Coagulation
  • Fibrinolysis
  • Thrombelastography

ASJC Scopus subject areas

  • Hematology


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