title: Red wine polyphenols improve an established aging-related endothelial dysfunction in the mesenteric artery of middle-aged rats: role of oxidative stress.
abstract: Aging is associated with blunted endothelium-dependent relaxations and vascular oxidative stress. Our previous study has indicated that daily intake of red wine polyphenols (RWPs) by young rats retards aging-related endothelial dysfunction in middle-aged rats. The aim of the present study is to determine whether intake of RWPs also improves an established endothelial dysfunction in middle-aged rats and, if so, to determine the underlying mechanism. Middle-aged rats (51 weeks) received either solvent (3% ethanol), RWPs extract (100mg/kg/day) or the antioxidant and NADPH oxidase inhibitor apocynin (100mg/kg/day) in the drinking water for 4 weeks. Vascular reactivity of mesenteric artery rings from control young (12 weeks) and middle-aged rats was assessed in organ chambers. The expression level of endothelial NO synthase (eNOS), arginase I, angiotensin II receptors (AT1R and AT2R), NADPH oxidase subunits and nitrotyrosines was assessed by immunohistochemistry, and the vascular formation of reactive oxygen species (ROS) by dihydroethidine. Aging is associated with blunted endothelium-dependent relaxations, an excessive vascular formation of ROS and peroxynitrites, and an up-regulation of eNOS, arginase I, NADPH oxidase subunits (nox-1, p22phox), and AT1R and AT2R expression. RWPs and apocynin treatments improved endothelial dysfunction, normalized oxidative stress and the expression of the different proteins in the mesenteric artery of middle-aged rats. The present findings indicate that aging is associated with blunted endothelium-dependent relaxations involving an increased oxidative stress, and that these responses are improved by the intake of RWPs or apocynin for 4weeks most likely by normalizing the expression of eNOS, arginase I, NADPH oxidase and angiotensin receptors.
authors.affiliation: UMR CNRS 7213, Laboratoire de Biophotonique et Pharmacologie, Faculté de Pharmacie, Université de Strasbourg, Illkirch, France.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Dal-Ros
authors.forename: Christian
authors.initials: C
authors.lastname: Bronner
authors.forename: Cyril
authors.initials: C
authors.lastname: Auger
authors.forename: Valérie B
authors.initials: VB
authors.lastname: Schini-Kerth
mesh_terms: D000098:Acetophenones / Q000008:administration & dosage; D000375:Aging / Q000187:drug effects*; D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage; D004730:Endothelium, Vascular / Q000187:drug effects* / Q000503:physiopathology; D008638:Mesenteric Arteries / Q000187:drug effects / Q000503:physiopathology; D019255:NADPH Oxidases / Q000096:biosynthesis; D052250:Nitric Oxide Synthase Type III / Q000096:biosynthesis; D018384:Oxidative Stress / Q000187:drug effects*; D059808:Polyphenols / Q000008:administration & dosage*; D051381:Rats; D017208:Rats, Wistar; D044140:Receptor, Angiotensin, Type 1 / Q000096:biosynthesis; D044139:Receptor, Angiotensin, Type 2 / Q000096:biosynthesis; D014664:Vasodilation / Q000187:drug effects* / Q000502:physiology; D014920:Wine
chemical_list: D000098:Acetophenones; D000975:Antioxidants; D059808:Polyphenols; D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; C056165:acetovanillone; D052250:Nitric Oxide Synthase Type III; C496316:Nos3 protein, rat; D019255:NADPH Oxidases