Effects of inducible nitric oxide synthase inhibition on the rat tail vascular bed reactivity three days after myocardium infarction.

Abstract:

:The acute phase of myocardial infarction promotes an inflammatory response that stimulates inducible nitric oxide synthase (iNOS). We investigated the iNOS role on the rat tail vascular bed reactivity 3 days after myocardial infarction. Vasodilator and vasoconstrictor responses were determined in isolated caudal vascular beds from Wistar rats 3 days after coronary artery ligation (CAL) and sham-operated animals (SHAM). Rats were treated with the iNOS inhibitor S-methylisothiourea sulfate (SMT), 5 mg Kg day, i.p. or placebo. Concentration of plasma nitrite/nitrate (NOx) and the expression of iNOS mRNA in tail arteries were evaluated. The CAL group showed increased maximal vasoconstrictor response to phenylephrine (SHAM= 241 +/- 8; CAL= 288 +/- 13 mm Hg, P < 0.05) and SMT treatment normalized this effect (CAL-SMT = 253 +/- 7 mm Hg, P < 0.05). The sensitivity to acetylcholine was reduced in the CAL group, but SMT treatment did not alter this response. The plasma NOx and iNOS mRNA expression in tail arteries were increased in CAL rats. SMT treatment reduced the plasma NOx in the CAL group and the arterial expression of iNOS mRNA in SHAM and CAL group. In conclusion, iNOS inhibition prevented the increased phenylephrine reactivity in rat caudal vascular beds 3 days after myocardial infarction.

journal_name

J Cardiovasc Pharmacol

authors

Sartório CL,Pinto VD,Cutini GJ,Vassallo DV,Stefanon I

doi

10.1097/01.fjc.0000156822.58081.be

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

321-6

issue

4

eissn

0160-2446

issn

1533-4023

pii

00005344-200504000-00008

journal_volume

45

pub_type

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