期刊
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY
卷 27, 期 5, 页码 1080-1086出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/ATVBAHA.107.139634
关键词
renal failure; atherosclerosis; blood pressure; oxidized low density lipoprotein antibodies; ICAM-1; VCAM-1; angiotensin converting enzyme inhibitor; angiotensin II receptor antagonist
Objective - Uremia accelerates atherosclerosis in apolipoprotein E-deficient (apoE(-/-)) mice. We examined whether this effect may be preventable by pharmacological blockade of the renin-angiotensin system (RAS). Methods and Results - Uremia was induced in apoE(-/-) mice by 5/6 nephrectomy (NX). Treatment with the angiotensin converting enzyme inhibitor enalapril (2 or 12 mg/kg/d) from week 4 to 36 after NX reduced the aortic plaque area fraction from 0.23 +/- 0.02 (n = 20) in untreated mice to 0.11 +/- 0.01 (n = 21) and 0.08 +/- 0.01 (n = 23), respectively (P < 0.0001); the aortic plaque area fraction was 0.09 +/- 0.01 (n = 22) in sham-operated controls. Enalapril from week 20 to 44 after NX also retarded the progression of atherosclerosis. Plasma levels of soluble intercellular adhesion molecule-1 (sICAM-1) and vascular cell adhesion molecule-1 (sVCAM-1) and concentrations of IgM antibodies against oxidized low density lipoprotein (OxLDL) increased after NX (P < 0.01). Enalapril (12 mg/kg/d) attenuated these increases (P < 0.05) and reduced aortic expression of vascular cell adhesion molecule (VCAM)-1 mRNA (P < 0.05). Atherosclerosis in NX mice was also reduced by losartan (an angiotensin II receptor-blocker), but not when blood pressure was lowered with hydralazine (a non-RAS-dependent vasodilator). Conclusion - The results suggest that inhibition of RAS abolishes the proatherogenic effect of uremia independent of its blood pressure-lowering effect, possibly because of antiinflammatory and antioxidative mechanisms.
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