Abstract
The anti-thrombotic effects of LB30057, a direct thrombin inhibitor, were evaluated with in vivo rat and dog thrombosis models. In rats, 1 mg/kg of LB30057 inhibited half of the clot forma-tions in the inferior vena cava at 5 minutes after intravenous application. When measured at 2 hours after oral application, 100 mg/kg prevented approximately half of the clot formations in the inferior vena cava and 50 mg/kg prolonged the mean occlusion time from 15.6+-1.3 min-utes to 47.2+-8.3 minutes in the carotid artery. In dogs, the formation of thrombus in the jugular vein was reduced to half at a dose range of 20–30 mg/kg at 6 hours after oral application. In addition, the LB30057 dosage required to reduce venous clot formation by approximately 80–90% in dogs was only about 10% of that required for the same reduction in rats. This is proba-bly due to the variation in its time-dependent blood concentration profiles in each species; for example, the plasma half-life of LB71350 in dogs was longer than that in rats (153.0+-3.0 vs. 129.7+-12.7 min at 30 mg/kg, i.v., respectively). AUC, Tmax, Cmax, and BA in dogs were 59, 8.9, 9.17, and 13.3 times higher than those in rats at oral 30 mg/kg, respectively. Taken together, these results suggest that LB30057 administered orally is effective in the prevention of arterial and venous thrombosis in rats and dogs. It therefore represents a good lead compound for investigations to discover a new, orally available, therapeutic agent for treating thrombotic dis-eases.
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Park, H.D., Kim, H.J., Oh, Y.S. et al. LB30057, an orally effective direct thrombin inhibitor, prevents arterial and venous thrombosis in Rats and Dogs. Arch Pharm Res 26, 224–231 (2003). https://doi.org/10.1007/BF02976834
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DOI: https://doi.org/10.1007/BF02976834