HMG-CoA reductase inhibitor improves endothelial dysfunction in spontaneous hypertensive rats via Down-regulation of caveolin-1 and activation of endothelial nitric oxide synthase

Jung Won Suh, Dong Ju Choi, Hyuk Jae Chang, Young Seok Cho, Tae Jin Youn, In Ho Chae, Kwang Il Kim, Cheol Ho Kim, Hyo soo Kim, Buyng Hee Oh, Young Bae Park

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Hypertension is associated with endothelial dysfunction and increased cardiovascular risk. Caveolin-1 regulates nitric oxide (NO) signaling by modulating endothelial nitric oxide synthase (eNOS). The purpose of this study was to examine whether HMG-CoA reductase inhibitor improves impaired endothelial function of the aorta in spontaneous hypertensive rat (SHR) and to determine the underlying mechanisms involved. Eight-week-old male SHR were assigned to either a control group (CON, n=11) or a rosuvastatin group (ROS, n=12), rosuvastatin (10 mg/kg/day) administered for eight weeks. Abdominal aortic rings were prepared and responses to acetylcholine (10-9-10-4 M) were determined in vitro. To evaluate the potential role of NO and caveolin-1, we examined the plasma activity of NOx, eNOS, phosphorylatedeNOS and expression of caveolin-1. The relaxation in response to acetylcholine was significantly enhanced in ROS compared to CON. Expression of eNOS RNA was unchanged, whereas NOx level and phosphorylated-eNOS at serine-1177 was increased accompanied with depressed level of caveolin-1 in ROS. We conclude that 3-Hydroxy-3-methylglutaryl Coenzyme-A (HMG-CoA) reductase inhibitor can improve impaired endothelial dysfunction in SHR, and its underlying mechanisms are associated with increased NO production. Furthermore, HMG-CoA reductase inhibitor can activate the eNOS by phosphorylation related to decreased caveolin-1 abundance. These results imply the therapeutic strategies for the high blood pressure-associated endothelial dysfunction through modifying caveolin status.

Original languageEnglish
Pages (from-to)16-23
Number of pages8
JournalJournal of Korean medical science
Issue number1
Publication statusPublished - 2010 Jan 1


All Science Journal Classification (ASJC) codes

  • Medicine(all)

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