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Research Article Free access | 10.1172/JCI115495

Active site-blocked factor IXa prevents intravascular thrombus formation in the coronary vasculature without inhibiting extravascular coagulation in a canine thrombosis model.

C R Benedict, J Ryan, B Wolitzky, R Ramos, M Gerlach, P Tijburg, and D Stern

Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Department of Internal Medicine, University of Texas Medical School, Houston 77225.

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Published November 1, 1991 - More info

Published in Volume 88, Issue 5 on November 1, 1991
J Clin Invest. 1991;88(5):1760–1765. https://doi.org/10.1172/JCI115495.
© 1991 The American Society for Clinical Investigation
Published November 1, 1991 - Version history
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Abstract

To assess the contribution of Factor IX/IXa, to intravascular thrombosis, a canine coronary thrombosis model was studied. Thrombus formation was initiated by applying current to a needle in the circumflex coronary artery. When 50% occlusion of the vessel developed, the current was stopped and animals received an intravenous bolus of either saline, bovine glutamyl-glycyl-arginyl-Factor IXa (IXai), a competitive inhibitor of Factor IXa assembly into the intrinsic Factor X activation complex, bovine Factor IX, or heparin. Animals receiving saline or Factor IX developed coronary occlusion due to a fibrin/platelet thrombus in 70 +/- 11 min. In contrast, infusion of IXai prevented thrombus formation completely (greater than 180 min) at doses of 460 and 300 micrograms/kg, and partially blocked thrombus formation at 150 micrograms/kg. IXai attenuated the accumulation of 125I-fibrinogen/fibrin at the site of the thrombus by approximately 67% (P less than 0.001) and resulted in approximately 26% decrease in serotonin release from platelets in coronary sinus (P less than 0.05). Hemostatic variables in animals receiving IXai, remained within normal limits. Animals given heparin in a concentration sufficient to prevent occlusive thrombosis had markedly increased bleeding, whereas heparin levels that maintained extravascular hemostasis did not prevent intracoronary thrombosis. This suggests that Factor IX/IXa can contribute to thrombus formation, and that inhibition of IXa participation in the clotting mechanism blocks intravascular thrombosis without impairing extravascular hemostasis.

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