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|Type:||Artigo de periódico|
|Title:||A New Inorganic Vasodilator, Trans-[ru(no)(nh3)4(poet)3](pf6) 3: Hypotensive Effect Of Endothelium-dependent And -independent Vasodilators In Different Hypertensive Animals Models|
|Author:||De Barros B.F.|
Toledo Jr. J.C.
|Abstract:||The hypotensive effect of RuNO was investigated in acute and chronic hypertensive rats, as well as in normotensive rats. Acute hypertension rats were used with 30% increase on basal BP (phenylephrine, angiotensin II (Ang II), NG-nitro-L-arginine methyl ester (L-NAME), and adult spontaneously hypertensive rats (SHR) (basal BP 168 ± 3 mm Hg) were used as models for chronic hypertension. Rats were implanted with catheters (iv/ia) for BP measurements and for in bolus administration of RuNO, sodium nitroprusside (SNP), and acetylcholine (Ach) (10, 20, 40 nmol/kg, iv). The principal findings of this study were: (i) The hypotensive response to RuNO was 150% higher in acutely (phenylephrine and Ang II) and chronically (SHR) hypertensive rats than in normotensive rats, except in the case of L-NAME-induced hypertension (ΔMAP = 10 ± 1.4 mm Hg). Chronic SHR showed 60% increase (ΔMAP = 19 ± 0.8 mm Hg) in the effect compared to normotensive rats. (ii) The hypotensive response to SNP was lower (60%) in hypertensive rats than in normotensive rats, when compared to RuNO. However, the responses were similar in L-NAME-induced hypertension (ΔMAP = 30 ± 2 mm Hg). (iii) The vasodilator response to Ach was increased in rats with Ang II-induced hypertension (ΔMAP = 53 ± 1 mm Hg) and in SHR (ΔMAP = 67 ± 3 mm Hg). RuNO response was more potent than SNP in hypertensive models and the increment in relation to normotensive was observed in the phenylephrine- and L-NAME-treated rats. This response could be correlated to the different endothelial dysfunction present in each model. © 2002 Elsevier Science (USA). All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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