Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/193932
Type: Artigo de periódico
Title: Chronic Nitric Oxide Inhibition As A Model Of Hypertensive Heart Muscle Disease.
Author: Moreno, H
Metze, K
Bento, A C
Antunes, E
Zatz, R
de Nucci, G
Abstract: We have compared the myocardial alterations in rats made hypertensive by the chronic inhibition of nitric oxide biosynthesis with those having renal hypertension (two kidney-one clip model). Male Wistar rats were chronically administered the nitric oxide synthase inhibitor N omega-nitro-L-arginine methyl ester (L-NAME) for 2, 4 and 8 weeks. Both groups initially developed a similar increase in blood pressure but only the 2K-1C rats developed myocardial hypertrophy after 2-4 weeks. L-NAME-treated animals developed a similar degree of hypertrophy following 8 weeks of treatment. As observed by light microscopy, the myocardial alterations in the latter animals consisted of extensive areas of fibrosis and myocardial necrosis, especially in regions of the subendocardium. The histological alterations induced by L-NAME were not caused by the accompanying hypertension, since the 2K-1C animals had a similar increase in arterial blood pressure without any significant alterations in the heart morphology. 2K-1C rats treated chronically with L-NAME behaved in a manner similar to the L-NAME-treated animals with regard to both the blood pressure increases and cardiac morphological alterations. Animals which received the inactive enantiomer D-NAME did not develop hypertension nor did they have any morphological abnormalities. Both the coronary flow and the contractile capacity of hearts isolated from rats treated with L-NAME for 8 weeks were impaired compared to control animals. These results indicate that the chronic inhibition of NO biosynthesis causes cardiac ischemia associated with a mechanical dysfunction that is unrelated to cardiac hypertrophy which is similar to those seen in some patients suffering from chronic arterial hypertension.
Subject: Analysis Of Variance
Animals
Cardiomegaly
Disease Models, Animal
Enzyme Inhibitors
Hemodynamics
Hypertension
Male
Myocardial Ischemia
Ng-nitroarginine Methyl Ester
Nitric Oxide
Organ Size
Rats
Rats, Wistar
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/8831944
Date Issue: -1-Uns- -1
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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