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Acetylcholine stimulated dilatation and stretch induced myogenic constriction in mesenteric artery of rats with chronic heart failure

Xu, Y., Henning, R. H., Lipsic, E., van Buiten, A., van Gilst, W. H. & Buikema, H., Feb-2007, In : European Journal of Heart Failure. 9, 2, p. 144-151 8 p.

Research output: Contribution to journalArticleAcademicpeer-review

Rats with chronic heart failure (CHF) develop increased myogenic constriction in mesenteric resistance arteries. Here we investigated increased myogenic constriction in relation to alterations in EDHF- and NO-mediated dilatation in CHF-rats.

Male Spraque-Dawley rats were subjected to myocardial-infarction or sham-surgery. At 9-10 weeks after surgery, isolated mesenteric artery ring preparations were studied in a wire-myograph. Stretch-induced myogenic constriction was obtained by stepwise increase of the internal circumference diameter (0.5-1.2 L100). Cyclooxygenase- and eNOS-inhibitors were employed to study NO- and EDHF-mediated dilatation in response to acetylcholine.

Rats with CHF (n = 8), but not sham-rats (n = 6), developed significant myogenic constriction. In addition, the contribution of endothelial dilator mediators was significantly altered in CHF-rats, with increased dependency on NO and decreased EDHF-mediated dilatation. Moreover, EDHF-mediated dilatation was inversely correlated with myogenic constriction in individual CHF-rats (r = -0.74, p = 0.04).

These data demonstrate increased myogenic constriction in mesenteric arteries of rats with CHF post-MI to be correlated to decreased EDHF-mediated dilatation. These lindings extend the previous observation that myogenic constriction antagonizes EDHF-mediated dilatation in rat coronary artery under normal conditions, and suggests this relationship also to become functional in mesenteric arteries under pathopbysiological conditions of CHF. (c) 2006 European Society of Cardiology. Published by Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)144-151
Number of pages8
JournalEuropean Journal of Heart Failure
Volume9
Issue number2
Publication statusPublished - Feb-2007

    Keywords

  • myocardial-infarction, chronic heart failure, mesenteric artery, myogenic constriction, NO, EDHF, ENDOTHELIAL DYSFUNCTION, NITRIC-OXIDE, MYOCARDIAL-INFARCTION, EDHF, CYTOCHROME-P450, MECHANISMS, RESISTANCE, INHIBITION, EXPRESSION, DILATION

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