Document Detail

Induction of cardiac angiotensin I-converting enzyme with dietary NaCl-loading in genetically hypertensive and normotensive rats.
MedLine Citation:
PMID:  7670928     Owner:  NLM     Status:  MEDLINE    
We have recently shown that the angiotensin I converting enzyme (ACE) gene is linked to NaCl-loaded blood pressure in the stroke-prone spontaneously hypertensive rat (SHRSP), and that high-NaCl loading selectively stimulates ACE in the aorta of SHRSP but not in normotensive Wistar-Kyoto (WKY) rats. We therefore investigated the relationship between cardiac ACE and the development of hypertension and left ventricular hypertrophy in response to normal- and high-NaCl diet in these rats. ACE mRNA and ACE activity were measured in left ventricular tissue after completion of hemodynamic characterization of the animals. While SHRSP rats increased blood pressure (P < 0.0001) and heart rate (P < 0.005) in response to high NaCl, blood pressure remained unchanged in WKY. Similarly, relative left ventricular weight increased only in SHRSP after high NaCl (P < 0.002). A significant two- to threefold increase of cardiac ACE mRNA and fourfold stimulation of ACE enzyme activity in response to high NaCl was found in both WKY and SHRSP rats (P < 0.005). The induction of ACE gene expression was significantly more pronounced in SHRSP compared to WKY (P < 0.02), whereas no significant strain differences in left ventricular ACE activity were found after either normal- or high-NaCl diet. Thus, arterial blood pressure and left ventricular weight remained unchanged in the WKY rats despite the activation of left ventricular ACE activity after high-NaCl exposure. These results demonstrate that left ventricular ACE activity is equally upregulated in response to high-NaCl in the normotensive and hypertensive strain, independently from the development of hypertension.(ABSTRACT TRUNCATED AT 250 WORDS)
R Kreutz; M S Fernandez-Alfonso; Y Liu; D Ganten; M Paul
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of molecular medicine (Berlin, Germany)     Volume:  73     ISSN:  0946-2716     ISO Abbreviation:  J. Mol. Med.     Publication Date:  1995 May 
Date Detail:
Created Date:  1995-10-19     Completed Date:  1995-10-19     Revised Date:  2011-07-08    
Medline Journal Info:
Nlm Unique ID:  9504370     Medline TA:  J Mol Med (Berl)     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  243-8     Citation Subset:  IM    
German Institute for High Blood Pressure Research, University of Heidelberg.
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MeSH Terms
Angiotensin II / blood
Enzyme Induction
Heart Ventricles / enzymology,  pathology
Hemodynamics / drug effects
Hypertension / enzymology*
Myocardium / enzymology*
Organ Size
Peptidyl-Dipeptidase A / biosynthesis*,  blood,  genetics
RNA, Messenger / analysis
Rats, Inbred SHR
Rats, Inbred WKY
Sodium Chloride, Dietary / pharmacology*
Reg. No./Substance:
0/RNA, Messenger; 0/Sodium Chloride, Dietary; 11128-99-7/Angiotensin II; EC A

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