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Therapeutic Targeting of Mitochondrial Superoxide in Hypertension Anna E. Dikalova, Alfiya T. Bikineyeva, Klaudia Budzyn, Rafal R. Nazarewicz, Louise McCann, William Lewis, David G. Harrison, Sergey I. Dikalov Rationale: Superoxide (O ) has been implicated in the pathogenesis of many human diseases including hyperten- sion; however, commonly used antioxidants have proven ineffective in clinical trials. It is possible that these agents are not adequately delivered to the subcellular sites of superoxide production. Objective: Because the mitochondria are important sources of reactive oxygen species, we postulated that mitochondrial targeting of superoxide scavenging would have therapeutic benefit. Methods and Results: In this study, we found that the hormone angiotensin (Ang II) increased endothelial mitochondrial superoxide production. Treatment with the mitochondria-targeted antioxidant mitoTEMPO . . decreased mitochondrial O , inhibited the total cellular O , reduced cellular NADPH oxidase activity, and 2 2 restored the level of bioavailable NO. These effects were mimicked by overexpressing the mitochondrial MnSOD (SOD2), whereas SOD2 depletion with small interfering RNA increased both basal and Ang II–stimulated cellular O . Treatment of mice in vivo with mitoTEMPO attenuated hypertension when given at the onset of Ang II infusion and decreased blood pressure by 30 mm Hg following
Circulation Research – Wolters Kluwer Health
Published: Jul 1, 2010
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