Abstract
Dronedarone has been associated with a reduced number of first hospitalisation due to acute coronary syndromes. Whether this is only due to the reduction in ventricular heart rate and blood pressure or whether other effects of dronedarone may be involved is currently elusive. This study was designed to investigate the role of dronedarone in arterial thrombus formation. C57Bl/6 mice were treated with dronedarone and arterial thrombosis was investigated using a mouse photochemical injury model. Dronedarone inhibited carotid artery thrombus formation in vivo (P < 0.05). Thrombin- and collagen-induced platelet aggregation was impaired in dronedarone-treated mice (P < 0.05), and expression of plasminogen activator inhibitor-1 (PAI1), an inhibitor of the fibrinolytic system, was reduced in the arterial wall (P < 0.05). In contrast, the level of tissue factor (TF), the main trigger of the coagulation cascade, and that of its physiological inhibitor, TF pathway inhibitor, did not differ. Similarly, coagulation times as measured by prothrombin time and activated partial thromboplastin time were comparable between the two groups. Dronedarone inhibits thrombus formation in vivo through inhibition of platelet aggregation and PAI1 expression. This effect occurs within the range of dronedarone concentrations measured in patients, and may represent a beneficial pleiotropic effect of this drug.
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Acknowledgments
This study was supported by the Swiss National Science Foundation (Grant no. 310030-135781/1 to FCT, Grant no. 3100-068118.02/1 to TFL; Berne, Switzerland), the Bonizzi-Theler Foundation (Zurich, Switzerland), Velux Foundation (Zurich, Switzerland), Wolfermann Nägeli Foundation (Zurich, Switzerland), MERCATOR Foundation (Essen, Germany), Sanofi-Aventis (Geneva, Switzerland), and the Swiss Heart Foundation (Berne, Switzerland).
Conflict of interest
The current study was supported by Sanofi-Aventis with a restricted research grant. Dr Steffel and Dr Duru have received consulting honoraria from Sanofi-Aventis.
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A. Breitenstein and S. H. M. Sluka contributed equally to this work.
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Breitenstein, A., Sluka, S.H.M., Akhmedov, A. et al. Dronedarone reduces arterial thrombus formation. Basic Res Cardiol 107, 302 (2012). https://doi.org/10.1007/s00395-012-0302-4
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DOI: https://doi.org/10.1007/s00395-012-0302-4