title: Effects of extremely low frequency magnetic field on the antioxidant defense system in mouse brain: a chemiluminescence study.
abstract: Among the putative mechanisms, by which extremely low frequency (ELF) magnetic field (MF) may affect biological systems is that of increasing free radical life span in organisms. To test this hypothesis, we investigated whether ELF (60 Hz) MF can modulate antioxidant system in mouse brain by detecting chemiluminescence and measuring superoxide dismutase (SOD) activity in homogenates of the organ. Compared to sham exposed control group, lucigenin-initiated chemiluminescence in exposed group was not significantly increased. However, lucigenin-amplified t-butyl hydroperoxide (TBHP)-initiated brain homogenates chemiluminescence, was significantly increased in mouse exposed to 60 Hz, MF, 12 G for 3 h compared to sham exposed group. We also measured SOD activity, that plays a critical role of the antioxidant defensive system in brain. In the group exposed to 60 Hz, MF, 12 G for 3 h, brain SOD activity was significantly increased. These results suggest that 60 Hz, MF could deteriorate antioxidant defensive system by reactive oxygen species (ROS), other than superoxide radicals. Further studies are needed to identify the kind of ROS generated by the exposure to 60 Hz, MF and elucidate how MF can affect biological system in connection with oxidative stress.
authors.affiliation: School of Physics, College of Natural Sciences, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-742, South Korea. donlee@phya.snu.ac.kr
authors.forename: Byung-Cheon
authors.initials: BC
authors.lastname: Lee
authors.forename: Hyeon-Min
authors.initials: HM
authors.lastname: Johng
authors.forename: Jae-Kwan
authors.initials: JK
authors.lastname: Lim
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Jeong
authors.forename: Ku Youn
authors.initials: KY
authors.lastname: Baik
authors.forename: Tae Jeong
authors.initials: TJ
authors.lastname: Nam
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Lee
authors.forename: Jungdae
authors.initials: J
authors.lastname: Kim
authors.forename: Uy Dong
authors.initials: UD
authors.lastname: Sohn
authors.forename: Gilwon
authors.initials: G
authors.lastname: Yoon
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Shin
authors.forename: Kwang-Sup
authors.initials: KS
authors.lastname: Soh
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001921:Brain / Q000201:enzymology / Q000378:metabolism*; D008163:Luminescent Measurements; D008280:Magnetics; D051379:Mice; D008807:Mice, Inbred BALB C; D013482:Superoxide Dismutase / Q000378:metabolism; D020122:tert-Butylhydroperoxide / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D020122:tert-Butylhydroperoxide; D013482:Superoxide Dismutase