Circulation. 2001;104:448-454
doi: 10.1161/hc2901.091399
doi: 10.1161/hc2901.091399
(Circulation. 2001;104:448.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
Accelerated Atherosclerosis, Aortic Aneurysm Formation, and Ischemic Heart Disease in Apolipoprotein E/Endothelial Nitric Oxide Synthase Double-Knockout Mice
From the Cardiovascular Research Center, Cardiology Division, and Department of Pathology (T.H.A.), Massachusetts General Hospital, and Harvard Medical School, Boston, Mass.
Correspondence to Paul L. Huang, MD, PhD, Cardiovascular Research Center, Massachusetts General Hospital East, 149 E 13th St, Charlestown, MA 02129. E-mail huangp{at}helix.mgh.harvard.edu
Background— To test whether deficiency in endothelial nitric oxide synthase (eNOS) affects atherosclerosis development, we compared lesion formation in apolipoprotein E (apoE)/eNOS-double knockout (DKO) and apoE-knockout (KO) control animals.
Methods and Results— After 16 weeks of "Western-type" diet, apoE/eNOS-DKO males and females showed significant increases in lesion area of 93.6% and 59.2% compared with apoE-KO mice. All apoE/eNOS-DKO animals studied developed peripheral coronary arteriosclerosis, associated with perivascular and myocardial fibrosis, whereas none of the apoE-KO mice did. Transthoracic echocardiography showed a significantly increased left ventricular wall thickness and decreased fractional shortening in DKO animals. Mean arterial pressure was increased in DKO mice and was comparable in degree to eNOS-KO animals. Male DKO animals developed atherosclerotic abdominal aneurysms and aortic dissection.
Conclusions— eNOS deficiency increases atherosclerosis in Western-type diet-fed apoE-KO animals and introduces coronary disease and an array of cardiovascular complications, including spontaneous aortic aneurysm and dissection. This phenotype constitutes the first murine model to demonstrate distal coronary arteriosclerosis associated with evidence of myocardial ischemia, infarction, and heart failure. Hypertrophy and reduced left ventricular function cannot be explained by increased blood pressure alone, because eNOS-KO animals do not develop these complications.
Key Words: arteriosclerosis • nitric oxide synthase • coronary disease • aneurysm • hypertension
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