Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Effect of Low-Energy Electron Irradiation on DNA Damage by Cu2+ Ion

  • Noh, Hyung-Ah (Physics Department, Chungnam National University) ;
  • Park, Yeunsoo (Plasma Technology Research Center, National Fusion Research Institute) ;
  • Cho, Hyuck (Physics Department, Chungnam National University)
  • Received : 2016.10.17
  • Accepted : 2017.01.11
  • Published : 2017.03.31
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Abstract

Background: The combined effect of the low energy electron (LEE) irradiation and $Cu^{2+}$ ion on DNA damage was investigated. Materials and Methods: Lyophilized pBR322 plasmid DNA films with various concentrations (1-15 mM) of $Cu^{2+}$ ion were independently irradiated by monochromatic LEEs with 5 eV. The types of DNA damage, single strand break (SSB) and double strand break (DSB), were separated and quantified by gel electrophoresis. Results and Discussion: Without electron irradiation, DNA damage was slightly increased with increasing Cu ion concentration via Fenton reaction. LEE-induced DNA damage, with no Cu ion, was only 6.6% via dissociative electron attachment (DEA) process. However, DNA damage was significantly increased through the combined effect of LEE-irradiation and Cu ion, except around 9 mM Cu ion. The possible pathways of DNA damage for each of these different cases were suggested. Conclusion: The combined effect of LEE-irradiation and Cu ion is likely to cause increasing dissociation after elevated transient negative ion state, resulting in the enhanced DNA damage. For the decrease of DNA damage at around 9-mM Cu ion, it is assumed to be related to the structural stabilization due to DNA inter- and intra-crosslinks via Cu ion.

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