© 1999 by European Society of Cardiology
Copyright © 1999, European Society of Cardiology
The angiotensin-converting enzyme inhibitor, fosinopril, and the angiotensin II receptor antagonist, losartan, inhibit LDL oxidation and attenuate atherosclerosis independent of lowering blood pressure in apolipoprotein E deficient mice
aThe Lipid Research Laboratory, Technion Faculty of Medicine, the Rappaport Institute for Research in the Medical Sciences, Haifa, Israel
bAnatomy Department, Technion, Haifa, Israel
cThe Laboratory of Biochemical Genetics and Metabolism, The Rockefeller University, New York, NY, USA
* Corresponding author. Tel.: +972-4-854-2059; fax: +972-4-854-2359 skeidar{at}rambam.health.gov.il
Objective: To investigate the possible mechanisms of the antiatherosclerotic effects of the angiotensin-converting enzyme (ACE) inhibitor, fosinopril, in apolipoprotein (apo) E deficient mice. Methods: Apo E deficient (E0) mice at the age of 8 weeks received either placebo or a high dose (25 mg/kg/d) of fosinopril supplemented in their drinking water. Results: After 12 weeks of treatment, fosinopril reduced the aortic lesion size by 70%, compared with the placebo group. At this dosage, fosinopril significantly reduced blood pressure from 93±2 mmHg before treatment to 70±2 mmHg at the end of the treatment period (P<0.005). Fosinopril also increased the resistance of the mice plasma low density lipoprotein (LDL) to CuSO4-induced oxidation, as shown by a 90% reduction in the LDL content of malondialdehyde (MDA) and also by a prolongation of the lag time required for the initiation of LDL oxidation (from 100 min in the placebo-treated mice to more than 240 min in the fosinopril-treated mice; P<0.001). In addition, fosinopril inhibited CuSO4-induced oxidation of LDL that was obtained from the aortas of the treated mice, as shown by an 18% and 37% reduction in the LDL content of lipid peroxides and hydroperoxy-cholesterol linoleate, respectively, compared with the placebo-treated mice (P<0.01). A low dosage of fosinopril (5 mg/kg/d) that was still adequate to reduce their plasma ACE activity and LDL propensity to lipid peroxidation was insufficient to lower their blood pressure. This dosage also reduced the aortic lesion size in the apo E deficient mice by 40% (P<0.01). Conclusions: The antiatherogenic effects of fosinopril in apo E deficient mice are due not only to blood pressure reduction but also to the direct inhibition of angiotensin II-dependent effects, which are probably also associated with the inhibition of LDL oxidation.
KEYWORDS Atherosclerosis; Apo E deficient mice; LDL oxidation; Angiotensin II; Blood pressure
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