Document Detail

Myocardial effect of converting enzyme inhibition in hypertensive and normotensive rats.
MedLine Citation:
PMID:  2975459     Owner:  NLM     Status:  MEDLINE    
The effects of converting enzyme inhibition on the cardiac mass, isomyosins polymorphism, and collagen network in the left ventricle have been studied in renovascular, hypertensive, spontaneously hypertensive, and normotensive rats. The isoenzyme profile of left ventricular myosins was used as an indirect marker of the intrinsic property of contractility, whereas the collagen network, measured by a morphometric method, represented an indirect structural marker of the arrhythmogenic risk. One-clip, two-kidney renovascular hypertension was associated with cardiac hypertrophy, a shift in the isomyosin profile, and accumulation of collagen within the left ventricular myocardium. In this renin-angiotensin-dependent model, one month of treatment with converting enzyme inhibitor normalized blood pressure and consistently reversed cardiac hypertrophy and the isomyosin profile. Converting enzyme inhibitor treatment of 12-week-old spontaneously hypertensive rats for three months significantly decreased blood pressure but did not completely normalize it. The increase in cardiac mass observed in spontaneously hypertensive rats was not reversed by this short treatment. Nevertheless, the percentage of the V1 form of myosin increased slightly after treatment, and the collagen content of the left ventricle was considerably decreased. Converting enzyme inhibition did not decrease blood pressure in DOCA-salt hypertension, and no changes were observed in cardiac hypertrophy, isomyosin profile, or the collagen network. The cardiac hypertrophy that occurs with aging in normotensive rats was associated with a significant shift in isomyosin profile and a large accumulation of collagen. Thus, aging mimics several of the quantitative and qualitative changes in the left ventricular protein profile observed in hypertension. In young normotensive rats, converting enzyme inhibition significantly decreased blood pressure and left ventricular mass, increased the percentage of V1 isomyosin, and prevented the accumulation of collagen. In one-year-old normotensive rats, treatment for six months with converting enzyme inhibitor decreased blood pressure, decreased cardiac mass, and prevented the accumulation of collagen; the isomyosin profile was not modified. Converting enzyme inhibition, by acting on cardiac afterload, can bring about quantitative and qualitative changes in the cardiac proteins of both hypertensive and normotensive rats.
J B Michel; J L Salzmann; M L Cerol; J C Dussaule; M Azizi; B Corman; J P Camilleri; P Corvol
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of medicine     Volume:  84     ISSN:  0002-9343     ISO Abbreviation:  Am. J. Med.     Publication Date:  1988 Mar 
Date Detail:
Created Date:  1989-03-02     Completed Date:  1989-03-02     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0267200     Medline TA:  Am J Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  12-21     Citation Subset:  AIM; IM    
Unité 36 Institut de la Sante et de la Recherche Medicale, Paris, France.
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MeSH Terms
Aging / metabolism
Angiotensin-Converting Enzyme Inhibitors / pharmacology*
Blood Pressure / drug effects
Collagen / metabolism
Heart / drug effects
Hypertension / drug therapy,  metabolism,  pathology*
Hypertension, Renovascular / drug therapy,  metabolism*,  pathology
Myocardium / metabolism,  pathology
Myosins / metabolism
Organ Size / drug effects
Rats, Inbred SHR
Rats, Inbred Strains
Renin-Angiotensin System
Reg. No./Substance:
0/Angiotensin-Converting Enzyme Inhibitors; 9007-34-5/Collagen; EC

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