Endothelin-receptor blockade improves endothelial vasomotor dysfunction in heart failure.

Abstract:

OBJECTIVES:To elucidate the effect of selective endothelin ET(A)- and mixed ET(A/B)-receptor antagonists on endothelial vasomotor dysfunction in rats with heart failure after myocardial infarction (MI). METHODS:Vasoreactivity and superoxide anion formation were determined in aortic rings from Wistar rats 12 weeks after extensive MI (>46% of left ventricle) compared to sham-operated animals. Rats were either treated with the selective ET(A)-receptor antagonist LU 135252 (30 mg/kg/day), the mixed ET(A/B)-receptor antagonist Bosentan (100 mg/kg/day) or placebo. RESULTS:In MI rats, the concentration-response curve of the endothelium-dependent, nitric oxide-mediated relaxation induced by acetylcholine was significantly shifted to the right and the maximum relaxation was attenuated. Long-term treatment with both ET antagonists significantly improved acetylcholine-induced relaxation in MI rats. LU 135252 was more effective than Bosentan. Endothelium-independent relaxations induced by sodium nitroprusside as well as endothelin- and phenylephrine-induced contractions were similar in all groups of rats. Plasma renin activity and aortic superoxide formation, which were enhanced in rats with heart failure, were normalized by LU 135252, but not by Bosentan treatment. CONCLUSIONS:Long-term treatment with ET-receptor antagonists improves endothelial vasomotor dysfunction in rats with chronic MI. This mechanism may essentially contribute to the beneficial effects of ET receptor blockade in heart failure.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Bauersachs J,Fraccarollo D,Galuppo P,Widder J,Ertl G

doi

10.1016/s0008-6363(00)00083-3

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

142-9

issue

1

eissn

0008-6363

issn

1755-3245

pii

S0008-6363(00)00083-3

journal_volume

47

pub_type

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