Dysfunction of Nrf2 decreases KBrO3-induced oxidative DNA damage in Ogg1-null mice

Biochem Biophys Res Commun. 2007 Dec 28;364(4):966-71. doi: 10.1016/j.bbrc.2007.10.123. Epub 2007 Oct 29.

Abstract

Transcription factor Nrf2 regulates production of antioxidants and protects cells from oxidative/electrophilic stresses. Paradoxically, glutathione, one of the Nrf2-regulated antioxidants, has been assumed to promote genotoxicity of KBrO3. To address this glutathione hypothesis, we examined roles Nrf2 plays in the cellular defense against KBrO3-induced oxidative damage using Nrf2-/-, Ogg1-/- and Nrf2::Ogg1 double knockout mice. We found that upon KBrO3 treatment Nrf2::Ogg1 double knockout animals suffered from severe kidney damage, but unexpectedly the double knockout mice accumulated lower level of 8-hydroxyguanine than Ogg1-/- mice. Thus, KBrO3-induced nephrotoxicity appears not to depend on the formation of 8-hydroxyguanine. Our data also indicate that both the KBrO3-induced nephrotoxicity and formation of 8-hydroxyguanine are Nrf2-controlled processes, but the changes of the glutathione level are Nrf2-independent. Based on these results we conclude that glutathione is a minor part of the mechanism promoting genotoxicity of KBrO3 in Ogg1 knockout mice.

MeSH terms

  • Animals
  • Bromates / pharmacology*
  • DNA Damage / drug effects
  • DNA Damage / physiology*
  • DNA Glycosylases / metabolism*
  • Kidney / drug effects
  • Kidney / metabolism*
  • Kidney / pathology
  • Liver / drug effects
  • Liver / metabolism*
  • Liver / pathology
  • Mice
  • Mice, Knockout
  • NF-E2-Related Factor 2 / metabolism*
  • Oxidation-Reduction / drug effects

Substances

  • Bromates
  • NF-E2-Related Factor 2
  • potassium bromate
  • DNA Glycosylases
  • Ogg1 protein, mouse