Non-specific inhibitors of nitric oxide synthase cause myocardial necrosis in the rat

dc.creatorMoreno, H
dc.creatorNathan, LP
dc.creatorMetze, K
dc.creatorCosta, SKP
dc.creatorAntunes, E
dc.creatorHyslop, S
dc.creatorZatz, R
dc.creatordeNucci, G
dc.date1997
dc.dateMAY
dc.date2014-12-16T11:36:25Z
dc.date2015-11-26T16:22:38Z
dc.date2014-12-16T11:36:25Z
dc.date2015-11-26T16:22:38Z
dc.date.accessioned2018-03-28T23:04:07Z
dc.date.available2018-03-28T23:04:07Z
dc.identifierClinical And Experimental Pharmacology And Physiology. Blackwell Science, v. 24, n. 5, n. 349, n. 352, 1997.
dc.identifier0305-1870
dc.identifierWOS:A1997WX25800010
dc.identifier10.1111/j.1440-1681.1997.tb01200.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/62080
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/62080
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/62080
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1268124
dc.description1. To study the effect of acute nitric oxide (NO) inhibition on the rat heart both in vitro and in vivo, male Wistar rats received a single bolus injection of saline, N-omega-nitro-L-arginine methyl ester (L-NAME; 0.5, 1.5, 5.0, 15.0 and 45.0 mg/kg) and D-NAME (45.0 mg/kg). 2. Animals were killed 72 h after the bolus injection of L-NAME and the hearts were removed and studied under light microscopy. In other groups of animals, saline, L-NAME and D-NAME were administered as above and the mean arterial blood pressure (MABP/carotid) was recorded, Furthermore, L-NAME was also administered in the drinking water (20 mg/kg per day) for 72 h and animals were then killed and their hearts evaluated as described above, Hearts of control animals were perfused in vitro and coronary flow was measured following saline, L-NAME (45 mu g/heart) and D-NAME (45 mu g/heart). 3. Areas of necrosis were observed in the left ventricle of animals that had received L-NAME at 5.0, 15.0 and 45.0 mg/kg, Also, only doses higher than 1.5 mg/kg caused an important increase in MABP. The frequency and extent of the lesions paralleled the dose of L-NAME administered and no lesions were observed in D-NAME- and saline-treated animals. 4. The oral administration of L-NAME also caused myocardial lesions similar to those described above, but the frequency and extent of these lesions were more discrete compared with those observed following 5.0 mg/kg, i.v., L-NAME. 5. Bolus injection of L-NAME into control rat hearts in vitro resulted in a small and transient fall in coronary flow (17.2 +/- 1.4 and 12.2 +/- 1.2 mL/min before and after L-NAME administration, respectively) within 30 s and this was followed 4.5 min later by a further (11.5 +/- 1.6 mL/min) decrease. The administration of D-NAME to control hearts caused no change in coronary flow. 6. In conclusion, the acute inhibition of NO biosynthesis by L-NAME causes myocardial necrosis, Both high levels of MABP and a small but significant reduction in coronary flow (associated or not) can be responsible for the lesions we found.
dc.description24
dc.description5
dc.description349
dc.description352
dc.languageen
dc.publisherBlackwell Science
dc.publisherCarlton
dc.publisherAustralia
dc.relationClinical And Experimental Pharmacology And Physiology
dc.relationClin. Exp. Pharmacol. Physiol.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectarterial hypertension
dc.subjectcoronary flow
dc.subjectischaemic cardiopathy
dc.subjectmyocardial infarctions
dc.subjectN-omega-nitro-L-arginine methyl ester
dc.subjectsyndrome X
dc.subjectAngina
dc.subjectModel
dc.titleNon-specific inhibitors of nitric oxide synthase cause myocardial necrosis in the rat
dc.typeArtículos de revistas


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