(Hypertension. 2000;36:142.)
© 2000 American Heart Association, Inc.
Scientific Contributions |
Induction of Oxidative Stress by Glutathione Depletion Causes Severe Hypertension in Normal Rats
From the Division of Nephrology and Hypertension, Department of Medicine, University of California, Irvine.
Correspondence to N. D. Vaziri, MD, MACP, Division of Nephrology and Hypertension, UCI Medical Center, 101 The City Drive, Orange, CA 92868. E-mail tabotten{at}uci.edu
Abstract—Several recent studies have shown that certain forms of genetic or acquired hypertension are associated with oxidative stress and that animals with those types of hypertension respond favorably to antioxidant therapy. We hypothesize that oxidative stress may cause hypertension via (among other mechanisms) enhanced oxidation and inactivation of nitric oxide (NO). To test this hypothesis, Sprague-Dawley rats were subjected to oxidative stress by glutathione (GSH) depletion by means of the GSH synthase inhibitor buthionine sulfoximine (BSO, 30 mmol/L in drinking water) for 2 weeks. The control group was given drug-free drinking water. In parallel experiments, subgroups of animals were provided vitamin E–fortified chow and vitamin C–supplemented drinking water. The BSO-treated group showed a 3-fold decrease in tissue GSH content, a marked elevation in blood pressure, and a significant reduction in the urinary excretion of the NO metabolite nitrate plus nitrite, which suggests depressed NO availability. These characteristics were associated with a significant accumulation in various tissues of nitrotyrosine, which is the footprint of NO inactivation by reactive oxygen species. Administration of vitamin E plus vitamin C ameliorated hypertension, improved urinary nitrate-plus-nitrite excretion, and mitigated nitrotyrosine accumulation (despite GSH depletion) in the BSO-treated animals but had no effect in the control group. In conclusion, GSH depletion resulted in perturbation of the NO system and severe hypertension in normal animals. The effects of BSO were mitigated by concomitant antioxidant therapy despite GSH depletion, which supports the notion that oxidative stress was involved in the pathogenesis of hypertension in this model.
Key Words: blood pressure • nitric oxide • antioxidants • hypertension, genetic • hypertension, essential
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