NDLI: Xanthine oxidase and mitochondria contribute to vascular superoxide anion generation in DOCA-salt hypertensive rats.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Viel, Emilie C. Benkirane, Karim Javeshghani, Danesh Touyz, Rhian M. Schiffrin, Ernesto L.
Description	Author Affiliation: Viel EC ( Lady Davis Institute for Medical Research, Montreal, QC, Canada H3T 1E2.)
Abstract	Vascular superoxide anion (O(2)(-)) levels are increased in DOCA-salt hypertensive rats. We hypothesized that the endothelin (ET)-1-induced generation of ROS in the aorta and resistance arteries of DOCA-salt rats originates partly from xanthine oxidase (XO) and mitochondria. Accordingly, we blocked XO and the mitochondrial oxidative phosphorylation chain to investigate their contribution to ROS production in mesenteric resistance arteries and the aorta from DOCA-salt rats. Systolic blood pressure rose in DOCA-salt rats and was reduced after 3 wk by apocynin [NAD(P)H oxidase inhibitor and/or radical scavenger], allopurinol (XO inhibitor), bosentan (ET(A/B) receptor antagonist), BMS-182874 (BMS; ET(A) receptor antagonist), and hydralazine. Plasma uric acid levels in DOCA-salt rats were similar to control unilaterally nephrectomized (UniNx) rats, reduced with allopurinol and bosentan, and increased with BMS. Levels of thiobarbituric acid-reacting substances were increased in DOCA-salt rats versus UniNx rats, and BMS, bosentan, and hydralazine prevented their increase. Dihydroethidium staining showed reduced O(2)(-) production in mesenteric arteries and the aorta from BMS- and bosentan-treated DOCA-salt rats compared with untreated DOCA-salt rats. Increased O(2)(-) derived from XO was reduced or prevented by all treatments in mesenteric arteries, whereas bosentan and BMS had no effect on aortas from DOCA-salt rats. O(2)(-) generation decreased with in situ treatment by tenoyltrifluoroacetone and CCCP, inhibitors of mitochondrial electron transport complexes II and IV, respectively, whereas rotenone (mitochondrial complex I inhibitor) had no effect. Our findings demonstrate the involvement of ET(A) receptor-modulated O(2)(*-) derived from XO and from mitochondrial oxidative enzymes in arteries from DOCA-salt rats.
File Format	HTM / HTML
ISSN	03636135
e-ISSN	15221539
DOI	10.1152/ajpheart.00304.2008
Journal	AJP: Heart and Circulatory Physiology
Issue Number	1
Volume Number	295
Language	English
Publisher	American Physiological Society
Publisher Date	2008-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Physiology Discipline Cardiology Aorta Metabolism Hypertension Mesenteric Arteries Mitochondria Superoxides Xanthine Oxidase Animals Antihypertensive Agents Pharmacology Drug Effects Enzymology Physiopathology Blood Pressure Creatinine Blood Desoxycorticosterone Disease Models, Animal Endothelin Receptor Antagonists Endothelin-1 Enzyme Inhibitors Free Radical Scavengers Chemically Induced Lipid Peroxidation Nadph Oxidase Antagonists & Inhibitors Nephrectomy Oxidative Phosphorylation Rats, Sprague-dawley Receptors, Endothelin Thiobarbituric Acid Reactive Substances Uncoupling Agents Uric Acid Vascular Resistance Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Cardiology and Cardiovascular Medicine

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