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- Title
Long-Term Ouabain Treatment Impairs Vascular Function in Resistance Arteries.
- Authors
Wenceslau, Camilla Ferreira; Davel, Ana Paula; Xavier, Fabiano Elias; Rossoni, Luciana Venturini
- Abstract
Background/Aims: The purpose of this study was to examine the cardiovascular effects of long-term ouabain treatment at different time points. Methods: Systolic blood pressure (SBP) was measured by tail-cuff method in male Wistar rats treated with ouabain (approx. 8.0 μg·day-1) or vehicle for 5, 10 and 20 weeks. Afterwards, vascular function was assessed in mesenteric resistance arteries (MRA) using a wire myograph. ROS production and COX-1 and COX-2, TNF-α, and IL-6 protein expression were investigated. Results: SBP was increased by ouabain treatment up to the 6th week and remained stable until the 20th week. However, noradrenaline-induced contraction increased only in MRA in rats treated with ouabain for 20 weeks. NOS inhibition and endothelium removal increased the noradrenaline response, but to a smaller magnitude in MRA in the ouabain group. Moreover, inhibition of COX-2 or incubation with superoxide dismutase restores noradrenaline-induced contraction in the 20-week ouabain group to control levels. ROS production as well as COX-2, IL-6 and TNF-α protein expression increased in MRA in this group. Conclusion: Although ouabain treatment induced hypertension in all groups, a larger noradrenaline induced contraction was observed over 20 weeks of treatment. This vascular dysfunction was related to COX-2-derived prostanoids and oxidative stress, increased pro- inflammatory cytokines and reduced NO bioavailability. Copyright © 2011 S. Karger AG, Basel
- Subjects
OXIDATIVE stress; CARDIOVASCULAR system abnormalities; THERAPEUTIC use of steroid hormones; ANGIOTENSINS; LABORATORY rats; ANALYSIS of variance; THERAPEUTICS
- Publication
Journal of Vascular Research, 2011, Vol 48, Issue 4, p316
- ISSN
1018-1172
- Publication type
Article
- DOI
10.1159/000322576