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Influence of irbesartan and enalapril on changes of renal function associated with the established phase of l-NAME hypertension.

Abstract：

OBJECTIVE:Reversibility of the systemic and renal alterations induced by N(omega)-nitro-L-arginine-methyl ester(L-NAME) was assessed by treatment with irbesartan and enalapril (30 and 10 mg/kg per 24 h, respectively) alone or in combination. DESIGN:L-NAME (20 mg/kg per 24 h) was given to rats for 6 weeks and treatments were administered during the last 2 weeks. Glomerular filtration rate and renal plasma flow [GFR and RPF per g of kidney weight (KW)] were determined using the clearance technique. RESULTS:Arterial pressure was similarly reduced by treatments. GFR was lower in L-NAME-treated rats than in controls (552 +/- 52 versus 1106 +/- 78 microl/min per g KW), whereas RPF was reduced to a larger extent, thus resulting in an increase in filtration fraction. GFR was normalized by irbesartan but not enalapril or the combination (1042 +/- 50, 790 +/- 79 and 725 +/- 38 microl/min per g KW, respectively). RPF returned to normal and filtration fraction fell markedly with the combination. All treatments reduced the lesions of preglomerular vessels and reversed L-NAME-induced albuminuria and cardiovascular hypertrophy. At a dose of 3 mg/kg per 24 h, irbesartan only reduced the lesions of the afferent arteriole. CONCLUSIONS:Through its effects on AT1 receptors, angiotensin II may play an important role in the maintenance of L-NAME hypertension and associated alterations. The lower GFR and filtration fraction observed with enalapril in the presence of irbesartan suggests the intervention of non-angiotensin II-mediated mechanism, and at the postglomerular level, in the effect of angiotensin-converting enzyme (ACE) inhibitors.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Jover B,Herizi A,Casellas D,Mimran A

doi

10.1097/00004872-200111000-00015

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

2039-46

issue

11

eissn

0263-6352

issn

1473-5598

journal_volume

19

pub_type

杂志文章

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