Abstract：
:Angiotensin II has previously been reported to have in vivo and in vitro cardiac hypertrophic effects. We used the salt-sensitive Dahl rat genetic strain to separate mechanical (pressure overload) vs. hormonal (renin-angiotensin system) input in cardiac hypertrophy. Blood pressure was significantly increased and left ventricular hypertrophy, as indexed by LV/BW ratios, was present at 7 and 15 days in rats receiving 4% and 8% NaCl compared to the 1% controls. There was no effect of the angiotensin converting enzyme inhibitor, enalapril maleate, on lowering the blood pressure in 8% NaCl-treated animals, however, there was a significant reduction in LV/BW ratio in 8% NaCl-treated animals that received this drug. Left ventricular angiotensinogen mRNA activity was significantly reduced in rats receiving 4% and 8% NaCl. In this model of hypertension the cardiac hypertrophy which develops is largely dependent on mechanical forces though there remains a significant contribution to this process from either circulating or localized angiotensin II production. Regulation of angiotensinogen gene expression in the hypertrophied left ventricle suggests that volume and electrolyte control of angiotensinogen gene expression in the heart and/or hereditary factors are predominant in the control of regulation of this gene in the left ventricle of Dahl rats.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Peeler TC,Baker KM,Esmurdoc CF,Chernin MIdoi
10.1007/BF00229802subject
Has Abstractpub_date
1991-05-29 00:00:00pages
45-50issue
1-2eissn
0300-8177issn
1573-4919journal_volume
104pub_type
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