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Solis, M.M. et al.

Intravenous recombinant soluble human thrombomodulin prevents venous thrombosis in a rat model.

Thrombomodulin is an endothelial surface thrombin receptor. Thrombin bound to thrombomodulin loses all procoagulant activity and instead activates the protein C anticoagulant pathway. We developed a recombinant thrombomodulin analog and compared the effects of recombinant thrombomodulin (100 micrograms/ea), saline (controls), recombinant hirudin (1.0 mg/kg), and heparin (100 units/kg) on thrombus formation, activated partial thromboplastin time, and tail transection bleeding time in a rat model of stasis-induced venous thrombosis. Results showed that thrombus was detected in the vena cava in six of the six rats treated with saline solution, in zero of the six rats treated with recombinant thrombomodulin (p less than 0.05), in one of six rats treated with recombinant hirudin (p less than 0.05), and in zero of six rats treated with heparin (p less than 0.05). The activated partial thromboplastin time in rats receiving recombinant thrombomodulin was slightly longer than controls (22 +/- 8 vs 37 +/- 6, p less than 0.05). The bleeding times in rats receiving recombinant thrombomodulin were approximately twice as long as controls (215 +/- 68 vs 545 +/- 173, p = 0.037). In all rats treated with recombinant hirudin or heparin, activated partial thromboplastin times were greater than 120 seconds and bleeding times were greater than 1200 seconds. We conclude that recombinant thrombomodulin inhibits venous thrombosis in a rat model with less prolongation of activated partial thromboplastin time and bleeding time than heparin or hirudin.[1]

References

Intravenous recombinant soluble human thrombomodulin prevents venous thrombosis in a rat model. Solis, M.M., Cook, C., Cook, J., Glaser, C., Light, D., Morser, J., Yu, S.C., Fink, L., Eidt, J.F. J. Vasc. Surg. (1991) [Pubmed]

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