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α-Lipoic Acid Reduces Hypertension and Increases Baroreflex Sensitivity in Renovascular Hypertensive Rats
Biotechnology Center, Federal University of Paraiba, João Pessoa, PB 58.051-900, Brazil
* Author to whom correspondence should be addressed.
Received: 13 September 2012; in revised form: 26 October 2012 / Accepted: 31 October 2012 / Published: 9 November 2012
Abstract: Renovascular hypertension has robust effects on control of blood pressure, including an impairment in baroreflex mechanisms, which involves oxidative stress. Although α-lipoic acid (LA) has been described as a potent antioxidant, its effect on renovascular hypertension and baroreflex sensitivity (BRS) has not been investigated. In the present study we analyzed the effects caused by chronic treatment with LA on blood pressure, heart rate and baroreflex sensitivity (sympathetic and parasympathetic components) in renovascular hypertensive rats. Male Wistar rats underwent 2-Kidney-1-Clip (2K1C) or sham surgery and were maintained untouched for four weeks to develop hypertension. Four weeks post-surgery, rats were treated with LA (60 mg/kg) or saline for 14 days orally. On the 15th day mean arterial pressure (MAP) and heart rate (HR) were recorded. In addition, baroreflex sensitivity test using phenylephrine (8 µg/kg, i.v.) and sodium nitroprusside (25 µg/kg, i.v.) was performed. Chronic treatment with LA decreased blood pressure in hypertensive animals; however, no significant changes in baseline HR were observed. Regarding baroreflex, LA treatment increased the sensitivity of both the sympathetic and parasympathetic components. All parameters studied were not affected by treatment with LA in normotensive animals. Our data suggest that chronic treatment with LA promotes antihypertensive effect and improves baroreflex sensitivity in rats with renovascular hypertension.
Keywords: 2K1C; blood pressure; reactive oxygen species; lipoic acid; parasympathetic; sympathetic
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Queiroz, T.M.; Guimarães, D.D.; Mendes-Junior, L.G.; Braga, V.A. α-Lipoic Acid Reduces Hypertension and Increases Baroreflex Sensitivity in Renovascular Hypertensive Rats. Molecules 2012, 17, 13357-13367.
Queiroz TM, Guimarães DD, Mendes-Junior LG, Braga VA. α-Lipoic Acid Reduces Hypertension and Increases Baroreflex Sensitivity in Renovascular Hypertensive Rats. Molecules. 2012; 17(11):13357-13367.
Queiroz, Thyago M.; Guimarães, Drielle D.; Mendes-Junior, Leônidas G.; Braga, Valdir A. 2012. "α-Lipoic Acid Reduces Hypertension and Increases Baroreflex Sensitivity in Renovascular Hypertensive Rats." Molecules 17, no. 11: 13357-13367.