Document Detail

Induction of angiotensin converting enzyme and angiotensin II receptors in the atherosclerotic aorta of high-cholesterol fed Cynomolgus monkeys.
MedLine Citation:
PMID:  9678783     Owner:  NLM     Status:  MEDLINE    
Antiatherogenic effects of imidapril and involvement of renin angiotensin system were examined in experimental atherosclerosis induced by feeding a high-cholesterol diet to Cynomolgus monkeys. Eighteen male monkeys were divided into three groups and placed under (1) normal diet (normal group), (2) high-cholesterol diet (control group), (3) high-cholesterol diet with imidapril (20 mg/kg body wt/day, orally) treatment (imidapril group). At the end of the experiment, the normal group showed no apparent atherosclerosis in their aorta evaluated by oil red-O staining, while the control group exhibited marked atherosclerotic involvement of the intimal surface of the aorta (58.4 +/- 9.3%, P < 0.01). Imidapril reduced systolic blood pressure and atherosclerotic involvement (24.1 +/- 5.5%, P < 0.05). Total cholesterol content of the descending thoracic aorta was also significantly reduced in the imidapril group. In the atherosclerotic vessels, angiotensin converting enzyme (ACE) activity evaluated by quantitative in vitro autoradiography was significantly increased in the intimal lesion. Further evaluation revealed angiotensin II (Ang II) type I (AT1) receptor density was significantly increased in the medial lesion and type II (AT2) receptor density in the adventitia. When the progression of atherosclerosis was impeded by imidapril treatment, the ACE activity level as well as the AT1 and AT2 receptor density remained at normal. Expression of mRNA for fibronectin, TGF-beta1, types I and III collagen was studied by Northern blot analysis. No significant differences in types I and III collagen mRNA levels were found between the control and imidapril group. On the other hand, mRNA expression for fibronectin and TGF-beta1 were much lower in the imidapril group than in the control group. These results suggest that increased production of Ang II and activated receptors may be involved in atherosclerotic process in this model and also antiatherogenic effect of imidapril may be derived from reduction of local Ang II production as well as its hypotensive action.
K Song; N Shiota; S Takai; H Takashima; H Iwasaki; S Kim; M Miyazaki
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Atherosclerosis     Volume:  138     ISSN:  0021-9150     ISO Abbreviation:  Atherosclerosis     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-09-25     Completed Date:  1998-09-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0242543     Medline TA:  Atherosclerosis     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  171-82     Citation Subset:  IM    
Department of Pharmacology, Osaka Medical College, Takatsuki, Japan.
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MeSH Terms
Angiotensin-Converting Enzyme Inhibitors / pharmacology
Aorta / metabolism*,  pathology
Arteriosclerosis / metabolism*,  pathology,  prevention & control
Cholesterol / metabolism
Cholesterol, Dietary / administration & dosage*,  pharmacology
Collagen / genetics
Fibronectins / genetics
Imidazoles / pharmacology
Macaca fascicularis
Peptidyl-Dipeptidase A / metabolism*
RNA, Messenger / metabolism
Receptors, Angiotensin / metabolism*
Transforming Growth Factor beta / genetics
Reg. No./Substance:
0/Angiotensin-Converting Enzyme Inhibitors; 0/Cholesterol, Dietary; 0/Fibronectins; 0/Imidazoles; 0/Imidazolidines; 0/RNA, Messenger; 0/Receptors, Angiotensin; 0/Transforming Growth Factor beta; 57-88-5/Cholesterol; 89396-94-1/imidapril; 9007-34-5/Collagen; EC A

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