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中国临床药理学与治疗学 ›› 2011, Vol. 16 ›› Issue (5): 492-495.

• 基础研究 • 上一篇    下一篇

依泽替米贝通过小凹蛋白1调节大鼠血管平滑肌细胞内脂质蓄积

庹勤慧1, 袁皓瑜1, 郭琰1, 于伟霞1, 廖端芳2   

  1. 1南华大学药物药理研究所,衡阳 421001,湖南;
    2湖南中医药大学药理教研室,长沙 410208,湖南
  • 收稿日期:2011-01-12 修回日期:2011-03-28 发布日期:2011-07-08
  • 通讯作者: 廖端芳,男,博士,教授,博士研究生导师,研究方向:心血管药理学。Tel:0731-88458002 E-mail:dfliao66@yahoo.com.cn
  • 作者简介:庹勤慧,女,博士,副教授,研究方向:心血管药理学。Tel:0734-8282614 E-mail:qhtuo@yahoo.com.cn
  • 基金资助:
    国家自然科学基金项目(30770868、30971170、30971267)

Ezetimibe inhibiting intracellular lipid accumulation through caveolin-1 in rat vascular smooth muscle cells

TUO Qin-hui1, YUAN Hao-yu1, GUO Yan1, YU Wei-xia1 , LIAO Duan-fang2   

  1. 1Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China;
    2Department of Pharmacology, Hunan University of Chinese Medicine, Changsha 410208,Hunan,China
  • Received:2011-01-12 Revised:2011-03-28 Published:2011-07-08

摘要: 目的: 观察依泽替米贝(ezetimibe)对大鼠血管平滑肌细胞内胆固醇蓄积的影响以及相关的作用机制。方法: 以原代培养大鼠血管平滑肌细胞(rat VSMCs)为研究对象,以 20 mg/L 胆固醇:甲基β环糊精复合物(Chol:MβCD)孵育细胞48 h形成荷脂细胞模型。不同浓度的依泽替米贝(3、10 、30 μmol/L)处理细胞 24 h,或以 30 μmol/L 依泽替米贝分别处理细胞不同时间(0、6、12、24、48 h),HPLC检测细胞内TC、游离胆固醇(FC)的含量,Western blotting检测小凹蛋白1(caveolin-1)蛋白的表达。结果: 不同浓度依泽替米贝(3、10 、30 μmol/L)作用于VSMCs源性荷脂细胞不同时间,细胞内TC、FC的含量呈浓度依赖性减少,以30 μmol/L浓度孵育 24 h 作用最强。Chol:MβCD明显减少细胞caveolin-1蛋白表达水平,依泽替米贝能够逆转这种作用。结论: 依泽替米贝抑制Chol:MβCD诱导的大鼠平滑肌细胞中胆固醇蓄积作用可能与caveolin-1有关。

关键词: 依泽替米贝, 血管平滑肌细胞, 胆固醇, 小凹蛋白1

Abstract: AIM: To determine the effects of ezetimibe on intracellular lipid accumulation and related mechanism in rat vascular smooth muscle cells (VSMCs).METHODS: VSMCs taken from rat aorta were respectively treated with different concentration of ezetimibe(0, 3, 10, 30 μmol/L)for 24 hours or treated with 30 μmol/L of ezetimibe for different time (0, 6, 12, 24, 48 hours). The concentration of total cholesterol and free cholesterol were detected by high performance liquid chromatography. The expression of caveolin-1 were detected by western blotting.RESULTS: The contents of intracellular total cholesterol (TC) and free cholesterol (FC) were significantly decreased with a peak at 30 μmol/L for 24 h in lipid-loaded cells by ezetimibe in a dose- and time-dependent manner.The level of caveolin-1 protein was elevated 70% by ezetimibe.CONCLUSION: Ezetimibe inhibits cholesterol:methy-β-cyclodextrin (Chol:MβCD)-induced cholesterol accumulation in cultured VSMC through modulating caveolin-1 .

Key words: Ezetimibe, Vascular smooth muscle cells, Cholesterol, Caveolin-1

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