Carcinogenesis, Teratogenesis & Mutagenesis

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Development and application of a screening system for DNA damage and repair based on dual luciferase assay in human HepG2 cells

ZHANG Rong1,NIU Yu-jie2,FAN Long-gang1,SHI Lei1,WANG Qian1,WANG Xiu-rong3   

  1. (1. Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang  050017; 2. Department of Occupational Health and Environmental Health, School of Public Health, Hebei Medical University, Shijiazhuang  050017; 3. Department of Immunology, School of Basic Medicine, Hebei Medical University, Shijiazhuang  050017, Hebei, China)
  • Received:2013-09-05 Revised:2013-10-03 Online:2013-11-30 Published:2013-11-30
  • Contact: ZHANG Rong,E-mail:zhangr-wh@126.com

Abstract:

 OBJECTIVE: Development of a screening system for DNA damage and repair based on dual luciferase assay in human HepG2 cells. METHODS:5 μmol/L CdCl2 was used to treat the plasmid pTK-RL in vitro. Plasmid pgadd153-luc and damaged pTK-RL were co-transfected into HepG2 cells and then the reconstituted HepG2 cells were treated with sixteen DNA-damaging agents and three non-genotoxic agents. The DNA damage and DNA repair abilities of HepG2 cells were measured by dual luciferase assay. Three organic extracts from different sites of soil (residential area,garbage dump and farmland) were evaluated by dual luciferase assay. DNA damage was detected by Comet assay. RESULTS:The dual luciferase assay could identify genotoxic and non-genotoxic agents. The three different soil samples had various levels of inducing DNA damage and decreasing DNA repair capacities in HepG2 cells following the order:residential area >garbage dump>farmland. CONCLUSION:In this study,the dual luciferase assay was developed to measure DNA damage and repair.

Key words: DNA damage, DNA repair, host cell reactivation assay, dual luciferase report gene, carcinogen