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Research ArticleCardiovascular

Attenuation by Statins of Membrane Raft-Redox Signaling in Coronary Arterial Endothelium

Yu-Miao Wei, Xiang Li, Jing Xiong, Justine M. Abais, Min Xia, Krishna M. Boini, Yang Zhang and Pin-Lan Li
Journal of Pharmacology and Experimental Therapeutics May 2013, 345 (2) 170-179; DOI: https://doi.org/10.1124/jpet.112.201442
Yu-Miao Wei
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Xiang Li
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Jing Xiong
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Justine M. Abais
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Min Xia
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Krishna M. Boini
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Yang Zhang
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Pin-Lan Li
Department of Pharmacology & Toxicology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia
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Abstract

Membrane raft (MR)–redox signaling platforms associated with NADPH oxidase are involved in coronary endothelial dysfunction. Here, we studied whether statins interfere with the formation of MR-redox signaling platforms to protect the coronary arterial endothelium from oxidized low-density lipoprotein (OxLDL)–induced injury and from acute hypercholesterolemia. In cultured human coronary arterial endothelial cells, confocal microscopy detected the formation of an MRs clustering when they were exposed to OxLDL, and such MR platform formation was inhibited markedly by statins, including pravastatin and simvastatin. In these MR clusters, NADPH oxidase subunits gp91phox and p47phox were aggregated and were markedly blocked by both statins. In addition, colocalization of acid sphingomyelinase (ASM) and ceramide was induced by OxLDL, which was blocked by statins. Electron spin resonance spectrometry showed that OxLDL-induced superoxide (O2.−) production in the MR fractions was substantially reduced by statins. In coronary artery intima of mice with acute hypercholesterolemia, confocal microscopy revealed a colocalization of gp91phox, p47phox, ASM, or ceramide in MR clusters. Such colocalization was rarely observed in the arteries of normal mice or significantly reduced by pretreatment of hypercholesterolemic mice with statins. Furthermore, O2.− production in situ was 3-fold higher in the coronary arteries from hypercholesterolemic mice than in those from normal mice, and such increase was inhibited by statins. Our results indicate that blockade of MR-redox signaling platform formation in endothelial cell membrane may be another important therapeutic mechanism of statins in preventing endothelial injury and atherosclerosis and may be associated with their direct action on membrane cholesterol structure and function.

Footnotes

    • Received October 29, 2012.
    • Accepted February 20, 2013.
  • This study was supported by the National Institutes of Health [Grants HL057244, HL075316, and HL091464].

  • dx.doi.org/10.1124/jpet.112.201442.

  • ↵Embedded ImageThis article has supplemental material available at jpet.aspetjournals.org.

  • Copyright © 2013 by The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 345 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 345, Issue 2
1 May 2013
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Research ArticleCardiovascular

Statins Inhibit NADPH Oxidase–Associated with Membrane Rafts

Yu-Miao Wei, Xiang Li, Jing Xiong, Justine M. Abais, Min Xia, Krishna M. Boini, Yang Zhang and Pin-Lan Li
Journal of Pharmacology and Experimental Therapeutics May 1, 2013, 345 (2) 170-179; DOI: https://doi.org/10.1124/jpet.112.201442

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Research ArticleCardiovascular

Statins Inhibit NADPH Oxidase–Associated with Membrane Rafts

Yu-Miao Wei, Xiang Li, Jing Xiong, Justine M. Abais, Min Xia, Krishna M. Boini, Yang Zhang and Pin-Lan Li
Journal of Pharmacology and Experimental Therapeutics May 1, 2013, 345 (2) 170-179; DOI: https://doi.org/10.1124/jpet.112.201442
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