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银杏叶提取物体外对铜离子诱导的人血清低密度脂蛋白氧化修饰的抑制作用

徐尚志, 刘耕陶   

  1. 中国医学科学院, 中国协和医科大学药物研究所, 北京 100050
  • 收稿日期:1998-11-09 修回日期:1999-04-04 出版日期:1999-09-15 发布日期:1999-09-15

Inhibitory Effect of EGb761 on Oxidation of Human Low Density Lipoproteins Induced by Cu2+ In Vitro

Xu Shangzhi, Liu Gengtao   

  1. Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050
  • Received:1998-11-09 Revised:1999-04-04 Online:1999-09-15 Published:1999-09-15

摘要: 本文在体外对EGb761能否抑制钢离子诱导的人血清低密度脂蛋白氧化修饰进行了研究。低密度脂蛋白(LDL)EGb761 40, 80, 160 mg·L-1预处理1h,然后用CuSO4 10 μmol·L-1氧化修饰10 h。结果表明LDL被钢离子氧化修饰后低密度脂蛋白中维生素E(VE)被耗竭,丙二醛(MDA)及自身荧光物质(LF)含量升高,载脂蛋白B(apoB)的电泳迁移速率加快。EGb761剂量依赖性地抑制VE的含量降低和MDA及自身荧光物质的含量升高,载脂蛋白B的电泳迁移速率依次减慢。可见在体EGb761能抑制钢离子诱导的人血清低密度脂蛋白氧化修饰。

关键词: 低密度脂蛋白, 铜离子, 丙二醛, 维生素E, 自身荧光物质, 银杏

Abstract: The effect of extract from leaves of Ginkgo biloba (EGb761) on the oxidation ofhuman serum low density lipoproteins (LDL) induced by Cu2+ in vitro was investigated . LDL waspretreated with EGb761 40, 80, or 160 mg·L-1 for 1 h and then was oxidized by CuSO4 10 μmol·L-1 for 10 h. It was found that after the oxidation of LDL induced by Cu2+, vitamin E (VE) in the oxidizedLDL (ox-LDL) was exhausted, while malondialdehyde (MDA) and lipofusion (LF) were markedlyincreased, the electrophoretic mobility of apolipoprotein B (apo B) was faster. EGb761 preveded thedecrease of VE and increases of MDA and LF in the ox-LDL, and slowed down the apo Belectrophoretic mobility in a dose-dependent manner. Therefore, EGb761 inhibits LDL oxidationinduced by Cu2+ in vitro.

Key words: Low density lipoproteins, Copper, Malondialdehyde, Vitamin E, Lipofusion, Ginkgo biloba

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