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喹乙醇诱导HepG2 细胞自噬的实验研究

赵东旭,张朝明,汤树生,王丛丛,张 燊,肖希龙*   

  1. ( 中国农业大学动物医学院药理和毒理教研室,北京 100193 )
  • 收稿日期:2012-11-26 修回日期:2013-03-29 出版日期:2013-05-30 发布日期:2013-05-30
  • 通讯作者: 肖希龙,Tel:010-62733377,E-mail:xiaoxl@cau. edu.cn
  • 作者简介:赵东旭(1990- ),男,安徽省六安市人,硕士,研究方向:分子与细胞毒理学。
  • 基金资助:

    中央高校基本科研业务费专项资金 (2011JS009)

Autophagic process induced by olaquindox in HepG2 cells

ZHAO Dong-xu,ZHANG Chao-ming,TANG Shu-sheng, WANG Cong-cong,ZHANG Shen,XIAO Xi-long*   

  1. (Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China)
  • Received:2012-11-26 Revised:2013-03-29 Online:2013-05-30 Published:2013-05-30
  • Contact: XIAO Xi-long,Tel:010-62733377,E-mail:xiaoxl@cau. edu.cn

摘要:

目的: 研究喹乙醇对HepG2细胞自噬的影响。方法:分别用不同浓度 (0、200、400、800 μg/mL)喹乙醇染毒HepG2细胞24 h后,进行单丹磺酰尸胺 (monodansylcadaverine,MDC)染色,分别通过荧光显微镜和流式细胞仪检测细胞自噬发生情况。另外,分别用不同浓度喹乙醇 (0、200、400、800 μg/mL)染毒HepG2细胞24 h和400 μg/mL喹乙醇染毒HepG2细胞不同时间 (0、1、3、6、12、24 h)后,采用Western blot方法检测自噬相关蛋白LC3-Ⅱ和Beclin 1的表达。结果:随着喹乙醇染毒剂量增加,MDC阳性细胞的荧光强度及细胞内MDC荧光颗粒数目明显增加。流式结果显示,与对照组相比,200、400和800 μg/mL染毒组MDC阳性细胞百分比均显著增加 (P<0.05或P<0.01)。随着喹乙醇染毒浓度和时间的增加,LC3-Ⅱ和Beclin 1表达量均明显增加,其中400 μg/mL 喹乙醇染毒细胞24 h组与对照组相比,LC3-Ⅱ和Beclin 1的表达量均明显上调 (P<0.01)。结论:喹乙醇诱导了HepG2细胞的自噬反应。

关键词: 喹乙醇, 自噬, MDC, LC3-II, Beclin 1

Abstract:

OBJECTIVE: To investigate the effect of olaquindox on autophagy in human hepatoma G2 (HepG2) cells. METHODS:The HepG2 cells were treated with different concentrations (0,200,400,800 μg/mL) of olaquindox for 24 h. Then autophagy was analyzed by fluorescence microscope and flow cytometer following staining with monodansylcadaverine (MDC). HepG2 cells were treated with different concentrations (0,200,400,800 μg/mL) of olaquindox for 24 h or with 400 μg/mL olaquindox for different periods (0,1,3,6,12,24 h). Then the expressions of LC3-Ⅱ and Beclin 1 were determined by Western blot. RESULTS:Olaquindox-treated cells exhibited higher fluorescent density and more MDC-labeled particles in HepG2 cells compared with the control group. The percentage of MDC-positive cells was obviously increased after treatment with different concentrations (200,400,800 μg/mL) of olaquindox for 24 h. (P<0.05 or P<0.01). The expressions of LC3-Ⅱ and Beclin 1 increased with different concentrations and different time points of olaquindox treatment. Moreover,compared with the control group,the expression of LC3-Ⅱ and Beclin 1 were increased significantly with treatment of 400 μg/mL olaquindox for 24 h (P<0.01). CONCLUSION: Olaquindox enhanced the autophagic process in HepG2 cells.

Key words: olaquindox, autophagy, MDC, LC3-Ⅱ, Beclin 1