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Oxidative stress produced through reactive oxygen species (ROS) enhancement is considered to play a key role in the development and maintenance of hypertension. In the vasculature, the most important source of ROS is the reduced nicotinamide adenine dinucleotide phosphate (NAD(P)H) oxidase enzyme. The principal stimulus of this enzyme is angiotensin II (Ang II). However, oxidative stress seems to be present in virtually all forms of hypertension including low-renin hypertension, where the levels of Ang II are reduced. For this reason, the question is if ROS generation is induced by Ang II or it is a consequence of hypertension. We used as hypertensive model the aortic coarctated rats, which were treated with losartan or minoxidil for 7 days. Thoracic aortic segments were excised, and the NAD(P)H oxidase subunits expression, oxidative stress parameters, and heme oxygenase-1 abundance were evaluated. Hypertensive animals had an increase in the activity and expression of NAD(P)H oxidase and, as a consequence, in the oxidative stress parameters. Interestingly, either losartan or minoxidil administration blunted those parameters, indicating that arterial pressure is the key factor in the development of oxidative stress in the hypertensive aorta. We suggest that antihypertensive drug administration at the beginning of this pathology delays the oxidative stress generation, thus preventing the aggravation of this disease. Copyright © 2009 by Lippincott Williams & Wilkins.


Documento: Artículo
Título:Lowering arterial pressure delays the oxidative stress generation in a renal experimental model of hypertension
Autor:Polizio, A.H.; Gorzalczany, S.B.; Tomaro, M.L.
Filiación:Departamento de Química Biológica, Universidad de Buenos Aires, Junín 956, Buenos Aires 1113, Argentina
Departamento de Farmacología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Angiotensin II; Antihypertensive drugs; Aorta; Arterial pressure; Oxidative stress; angiotensin II; heme oxygenase 1; losartan; minoxidil; reactive oxygen metabolite; reduced nicotinamide adenine dinucleotide phosphate oxidase; superoxide; animal experiment; animal model; animal tissue; arterial pressure; article; controlled study; enzyme activity; hypertension; male; nitrosative stress; nonhuman; oxidative stress; priority journal; protein expression; rat; thoracic aorta; Animals; Antihypertensive Agents; Aorta, Thoracic; Blood Pressure; Disease Models, Animal; Heme Oxygenase (Decyclizing); Hypertension, Renal; Losartan; Male; Minoxidil; NADPH Oxidase; Oxidative Stress; Rats; Rats, Wistar; Reactive Oxygen Species
Página de inicio:348
Página de fin:354
Título revista:Journal of Cardiovascular Pharmacology
Título revista abreviado:J. Cardiovasc. Pharmacol.
CAS:angiotensin II, 11128-99-7; losartan, 114798-26-4; minoxidil, 38304-91-5; reduced nicotinamide adenine dinucleotide phosphate oxidase, 9032-22-8; superoxide, 11062-77-4; Antihypertensive Agents; Heme Oxygenase (Decyclizing),; Hmox1 protein, rat,; Losartan, 114798-26-4; Minoxidil, 38304-91-5; NADPH Oxidase,; Reactive Oxygen Species


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---------- APA ----------
Polizio, A.H., Gorzalczany, S.B. & Tomaro, M.L. (2009) . Lowering arterial pressure delays the oxidative stress generation in a renal experimental model of hypertension. Journal of Cardiovascular Pharmacology, 54(4), 348-354.
---------- CHICAGO ----------
Polizio, A.H., Gorzalczany, S.B., Tomaro, M.L. "Lowering arterial pressure delays the oxidative stress generation in a renal experimental model of hypertension" . Journal of Cardiovascular Pharmacology 54, no. 4 (2009) : 348-354.
---------- MLA ----------
Polizio, A.H., Gorzalczany, S.B., Tomaro, M.L. "Lowering arterial pressure delays the oxidative stress generation in a renal experimental model of hypertension" . Journal of Cardiovascular Pharmacology, vol. 54, no. 4, 2009, pp. 348-354.
---------- VANCOUVER ----------
Polizio, A.H., Gorzalczany, S.B., Tomaro, M.L. Lowering arterial pressure delays the oxidative stress generation in a renal experimental model of hypertension. J. Cardiovasc. Pharmacol. 2009;54(4):348-354.