Why the study?
Both dabigatran and its main metabolite dabigatran acylglucuronide have established anticoagulant effects, but their relative anticoagulant effects in humans remained to be compared.
Does dabigatran acylglucuronide have a weaker anticoagulant effect compared to dabigatran in vitro?
Does dabigatran acylglucuronide have a weaker anticoagulant effect compared to dabigatran in vitro?
Dabigatran acylglucuronide, the main active metabolite of dabigatran, exhibits a weaker anticoagulant effect than the parent drug in vitro.
Should not yet change dabigatran assay or reversal practice; leaves open the clinical significance of differential metabolite activity.
Dabigatran (DAB) is an orally administered thrombin inhibitor. Both DAB and its main metabolite dabigatran acylglucuronide (DABG) have established anticoagulant effects. Here, we aimed to compare the relative anticoagulant effects of DABG and DAB in humans. Anticoagulant effects of DAB and DABG were measured in vitro using a thrombin generation assay. Additionally, their effects on other coagulation assays including PT, aPTT, TT, and fibrinogen were compared. Both DAB and DABG showed inhibitory effects on thrombin generation in a dose-dependent manner, but DABG exhibited a weaker inhibitory effect than that of DAB. The IC50 values of DAB and DABG on thrombin generation AUC were 134.1 ng/mL and 281.9 ng/mL, respectively. DABG also exhibited weaker anticoagulant effects than DAB on PT, aPTT, and TT. The results of the present study indicate that the anticoagulant effect of DABG, a main active DAB metabolite, is weaker than that of DAB.
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Kim et al. (2022) studied this question.
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