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• W1975141925 endingPage "664" @default.
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• W1975141925 abstract "1. The tissue-protective effects of calcium channel blockers in hypertension are not well dissociated from their effect on systolic blood pressure (SBP). We have previously shown that lacidipine, a dihydropyridine-type calcium antagonist, reduced the cardiac hypertrophy and the cardiac endothelin-1 (ET-1) gene overexpression occurring in salt-loaded stroke-prone spontaneously hypertensive rats (SL-SHRSP), an effect occurring without systolic blood pressure (SBP) change. In the present study, we have examined whether this action was dose-related and if it could be associated with ET receptor changes. The action of lacidipine was also examined in control SHRSP and in Wistar Kyoto rats (WKY). 2. The daily dose of 0.3 mg kg-1 lacidipine which did not lower SBP but significantly prevented ventricle hypertrophy and cardiac preproET-1-mRNA expression in SL-SHRSP was inactive in control SHRSP. With the higher dose of lacidipine (1 mg kg-1 day-1), we observed a further reduction of cardiac hypertrophy and of ET-1 gene expression in SL-SHRSP and a significant effect on those parameters in control SHRSP but only a small reduction of SBP in both groups. 3. In WKY, salt loading did not induce change in SBP or increase of cardiac ET-1 gene expression and ventricle mass. In these normotensive rats, lacidipine (1 mg kg-1 day-1) did not modulate the basal preproET-1-mRNA expression and did not affect SBP or heart weight. 4. The maximum binding capacity (Bmax) and the dissociation constant (KD) of [125I]-ET-1 binding and the relative proportion of low- and high-affinity binding sites for ET-3 were not significantly affected by salt loading or lacidipine treatment in SHRSP. 5. These results show that lacidipine exerted a dose-related inhibition of ventricle hypertrophy and preproET-1-mRNA expression in SHRSP and indicate that this effect was unrelated to SBP changes. The dose-dependency of this inhibition suggests that salt-induced cardiac hypertrophy could be related to ET-1 gene overexpression. The results further show that ET receptor changes are not involved in the pathophysiological process studied here." @default.
• W1975141925 created "2016-06-24" @default.
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• W1975141925 date "1996-06-01" @default.
• W1975141925 modified "2023-10-17" @default.
• W1975141925 title "Action of the calcium channel blocker lacidipine on cardiac hypertrophy and endothelin-1 gene expression in stroke-prone hypertensive rats" @default.
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• W1975141925 doi "https://doi.org/10.1111/j.1476-5381.1996.tb15451.x" @default.
• W1975141925 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1909705" @default.
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