Carcinogenesis, Teratogenesis & Mutagenesis ›› 2016, Vol. 28 ›› Issue (1): 8-13,18.doi: 10.3969/j.issn.1004-616x.2016.01.002

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Effects of glutathione peroxidase 1 overexpression on DNA oxidative damage and phenotype of malignant BERP35T1 cells

SHAO Shuai, WEI Zhiquan, ZHANG Wei, TONG Peng, WANG Chunyan, QI Xuesong, GOU Qiao   

  1. Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, China CDC, Beijing 100088, China
  • Received:2015-05-04 Revised:2015-10-28 Online:2016-01-31 Published:2016-01-31

Abstract: OBJECTIVE: To study the effects of glutathione peroxidase 1(GPX1) overexpression on DNA oxidative damage level and phenotype of malignant BERP35T1 cells exposed upon α-particles. METHODS: The eukaryotic expression vector pEGFP-GPX1 was constructed. After PCR,enzyme digestion analysis and sequencing pEGFP-GPX1 and control vector were transfected into BERP35T1 cells with lipofectamine 2000 and G418 screening was used to obtain resistant cell lines. The expression of GPX1 was measured by Western blot. MTT,scratching healing test and anchorage independence growth test were used to analyze the effects of GPX1 overexpression on growth rate,migration and colony forming efficiency of BERP35T1 cells. RESULTS: pEGFP-GPX1 was confirmed by PCR,enzyme digestion analysis and sequencing. The sequence of the target gene GPX1 was entirely correct. The protein expression level of GPX1 in pEGFP-GPX1 transfected group BERP35T1-GPX1-6 was 4.01 times higher than in BERP35T1-pEGFP cells(P<0.05). Compared with BERP35T1 and BERP35T1-pEGFP,the level of growth rate,migration and colony forming efficiency in BERP35T1-GPX1-6 decreased significantly(P<0.05). CONCLUSION: GPX1 overexpression may inhibit the proliferation and metastasis of malignant BERP35T1 cells exposed to α-particles through reducing the level of DNA oxidative damage.

Key words: glutathione peroxidase 1, α-particle, lung cancer, oxidative stress

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