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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Different antithrombotic properties of factor Xa inhibitor and thrombin inhibitor in rat thrombosis models.

We compared the antithrombotic properties of a factor Xa inhibitor (DX-9065a) with those of a thrombin inhibitor (melagatran) in a rat disseminated intravascular coagulation model and a rat venous thrombosis model. Rat disseminated intravascular coagulation and venous thrombosis models were produced by injection of tissue factor and platinum wire placement, respectively. DX-9065a exerted antithrombotic effects dose dependently in both models. Melagatran was also effective in the venous thrombosis model, whereas it showed an aggravation in the disseminated intravascular coagulation model at low but not high doses. In the in vitro study, DX-9065a decreased the C(max) of the thrombin generation curve in plasma irrespective of whether protein C was present or not. However, melagatran increased the C(max) at low concentrations when protein C was present. This increase was not detected in protein C-deficient plasma. These results suggest that, unlike DX-9065a, melagatran in low doses aggravates disseminated intravascular coagulation by increasing thrombin generation, which may be partly due to suppression of negative feedback by activated protein C.[1]


  1. Different antithrombotic properties of factor Xa inhibitor and thrombin inhibitor in rat thrombosis models. Furugohri, T., Shiozaki, Y., Muramatsu, S., Honda, Y., Matsumoto, C., Isobe, K., Sugiyama, N. Eur. J. Pharmacol. (2005) [Pubmed]
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