Carcinogenesis, Teratogenesis & Mutagenesis ›› 2019, Vol. 31 ›› Issue (6): 454-458,463.doi: 10.3969/j.issn.1004-616x.2019.06.007

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DNA oxidation and methylation effects in nano-graphene oxide-exposed 16HBE cells

PENG Changfeng, XIE Xing, KE Yuebin   

  1. Shenzhen Center for Diseases Control and Prevention, Shenzhen 518020, Guangdong, China
  • Received:2019-08-01 Revised:2019-10-23 Online:2019-11-30 Published:2019-12-04

Abstract: OBJECTIVE: To study the induction of DNA oxidation and methylation in nano-graphene oxide (NGO)-exposed 16HBE cells,the quantities of 8-OHdG and DNA 5-mC were determined. METHODS: 16HBE cells were exposed to 1.25,2.5,5 or 10 μg/mL NGO solution for 24 h,8-OHdG and genomic DNA 5-mC were analyzed using high-performance liquid chromatography and high performance capillary electrophoresis,respectively. RESULTS: NGO induced the formation of 8-OHdG and 5-mC in different characteristics. With 2.5,5,10 μg/mL NGO,8-OHdG quantities in the treated groups were significantly higher than that in the control group (P < 0.05 or P < 0.01),and in a dose-dependent manner. However,significant reduction of DNA methylation was observed using the same doses,by 37.1%,49.7% and 46.3%,respectively,compared to that in the control group (P < 0.05 or P < 0.01). The two endpoints were significantly and negatively correlated (r=-0.69,P < 0.01). CONCLUSION: Our data indicate that NGO exposure in cells caused increased DNA oxidation but decreased DNA methylation. It is possible that cellular DNA oxidation may affect DNA methylation.

Key words: nano-graphene oxide, DNA oxidation, 8-OHdG, DNA methylation, demethylation

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