Carcinogenesis, Teratogenesis & Mutagenesis

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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

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