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Altered ATP-sensitive potassium channels may underscore obesity-triggered increase in blood pressure

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Abstract:

Abstract

Aim: To determine whether ATP-sensitive potassium channels are altered in VSMC from arotas and mesenteric arteries of obese rat, and their association with obesity-triggered increase in blood pressure. Methods: Obesity was induced by 24 weeks of high-fat diet feeding in male Sprague-Dawley rats. Control rats were fed with standard laboratory rat chow. Blood pressure and body weight of these rats were measured every 4 weeks. At the end of 24 weeks, KATP channel-mediated relaxation responses in the aortas and mesenteric arteries, KATP channel current, and gene expression were examined, respectively. Results: Blood pressure and body weight were increased in rats fed with high-fat diet. KATP channel-mediated relaxation responses, currents, and KATP expression in VSMC of both aortas and mesenteric arteries were inhibited in these rats. Conclusion: Altered ATP-sensitive potassium channels in obese rats may underscore obesity-triggered increase in blood pressure.

Keywords: ATP-sensitive potassium channel; aorta; electrophysiology; mesenteric artery; obesity-hypertension

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1745-7254.2008.00810.x

Affiliations: 1: Department of Cardiology, The First Affiliated Hospital of Xi-an Jiaotong University School of Medicine, Xi-an 710061, China 2: Department of Pharmacology, Xi'an Jiaotong University School of Medicine, Xi-an 710061, China

Publication date: October 1, 2008

bsc/aphs/2008/00000029/00000010/art00004
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