Ischaemia or reperfusion: which is a main trigger for changes in nitric oxide mRNA synthases expression?

Abstract:

OBJECTIVE:To investigate alterations in endothelial nitric oxide synthase and inducible nitric oxide synthase mRNA expressions and nitric oxide release in the myocardium during ischaemia/reperfusion and determine whether these changes are ischaemic and/or reperfusion dependent. MATERIALS AND METHODS:Isolated rat hearts were perfused by a modified Langendorff system. Following 1 h of global cardioplegic ischaemia, left ventricle haemodynamic parameters were recorded at baseline and during 30 min of reperfusion. Levels of endothelial, inducible nitric oxide synthases mRNA expression and nitric oxide release were measured at baseline, after ischaemia and at 30 min of reperfusion. RESULTS:Global cardioplegic ischaemia caused a significant depression of left ventricular function and a decrease of coronary flow. Postischaemic intensities of the endothelial nitric oxide synthase mRNA bands were significantly lower than at baseline (P < 0.01). There were no significant differences in endothelial nitric oxide synthase mRNA band intensities immediately after ischaemia compared to the end of reperfusion, nor between the intensities of inducible nitric oxide synthase mRNA bands at baseline, at end of ischaemia and at end of reperfusion. Nitric oxide in the myocardial effluent was below detectable levels at all measured points. CONCLUSION:Ischaemic injury causes down-regulation of endothelial nitric oxide synthase mRNA expression, which is then associated with reduction of coronary flow during reperfusion, representing one possible mechanism of ischaemia/reperfusion injury. We did not find expected elevations of inducible nitric oxide synthase mRNA expression during ischaemia or reperfusion and we suggest that ischaemia/reperfusion injury is not associated with nitric oxide overproduction.

journal_name

Eur J Clin Invest

authors

Pevni D,Frolkis I,Shapira I,Schwartz D,Schwartz IF,Chernichovski T,Lev-Ran O,Sharony R,Uretzky G

doi

10.1111/j.1365-2362.2005.01553.x

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

546-50

issue

9

eissn

0014-2972

issn

1365-2362

pii

ECI1553

journal_volume

35

pub_type

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