Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1936263 | Biochemical and Biophysical Research Communications | 2007 | 6 Pages |
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 Nrf2â/â, Ogg1â/â 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 Ogg1â/â 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.
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Authors
PaweÅ JaÅoszyÅski, Soichiro Murata, Yasuhiro Shinkai, Satoru Takahashi, Yoshito Kumagai, Susumu Nishimura, Masayuki Yamamoto,