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Influence of hypertension on nitric oxide synthase expression and vascular effects of lipopolysaccharide in rat mesenteric arteries.

Abstract：

:1. Experiments were designed to investigate the effects of the inducible nitric oxide synthase (iNOS) stimulator, lipopolysaccharide (LPS), on noradrenaline (NA) responses and on NOS activity and its expression in intact mesenteric resistance arteries (MRAs) from Wistar Kyoto (WKY) and spontaneously hypertensive (SHR) rats. 2. In MRAs from WKY, LPS (10 microg ml(-1); 1-5 h) reduced the vasoconstrictor responses to NA (0.1 - 30 microM) in the presence, but not in the absence of L-arginine (L-Arg, 10 microM). However, in SHR arteries, LPS induced an incubation-time dependent reduction of NA responses in the absence, as well as the presence, of L-Arg. The LPS inhibitory effect was reduced by the non-specific NOS inhibitor L-N(G)-nitroarginine methyl ester (L-NAME, 100 microM) and the selective iNOS inhibitor, aminoguanidine (100 microM). 3. L-NAME alone similarly shifted the concentration-response curve to NA leftward in arteries from both strains, while aminoguanidine had no effect. L-Arg shifted the curve to NA rightward only in SHR MRAs. 4. Basal activity of both iNOS and constitutive NOS (conversion of [(3)H]-L-Arg to [(3)H]-L-citrulline) was similar in arteries from both strains. After 5 h incubation with LPS, only iNOS activity in arteries from SHR was increased. 5. Basal iNOS protein expression was undetectable; basal endothelial (eNOS) protein expression was similar in arteries from both strains, while neuronal (nNOS) was greater in arteries from SHR. LPS induced iNOS protein expression, that was higher in arteries from SHR than in those from WKY. 6. These results indicate that NO production, via iNOS induction, is greater than in those from MRAs from SHR to WKY.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Briones AM,Alonso MJ,Marín J,Balfagón G,Salaices M

doi

10.1038/sj.bjp.0703552

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

185-94

issue

2

eissn

0007-1188

issn

1476-5381

journal_volume

131

pub_type

杂志文章

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