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It is known that angiotensin II (Ang II) exerts an antifibrinolytic effect by stimulating synthesis of plasminogen activator inhibitor type-1 (PAI-1), a specific inhibitor of tissue plasminogen activator (t-PA). The aim of this study was to compare the antithrombotic potency of imidapril, an angiotensin-converting enzyme (ACE) inhibitor, and candesartan, an angiotensin II type 1 (AT1) receptor antagonist, in a model of arterial thrombosis in spontaneously hypertensive rats (SHRs). Oral treatment with 5 mg/kg imidapril 1 h before induction of thrombosis resulted in a significant reduction in thrombus weight, whereas candesartan did not affect thrombus weight under the same treatment conditions. Candesartan lowered blood pressure to the same degree as in the imidapril-treated rats. Imidapril not only reduce the serum and aortic ACE activities, but also reduced aortic PAI-1 protein levels, while candesartan had no effect on theses. These results suggest that imidapril, but not the AT1 receptor antagonist, candesartan, enhances fibrinolysis via a reduction of aortic PAI-1 levels by inhibiting ACE and prevents thrombus formation in SHRs.

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Imidapril, an Angiotensin-Converting Enzyme Inhibitor, Inhibits Thrombosis via Reduction in Aortic Plasminogen Activator Inhibitor Type-1 Levels in Spontaneously Hypertensive Rats.