Related Experiment Videos
Effect of high-density extremely low frequency magnetic field on sister chromatid exchanges in mouse m5S cells
H Yaguchi1, M Yoshida, Y Ejima
1Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.
Abstract:
The induction of sister chromatid exchanges (SCEs) was evaluated in the cultured mouse m5S cells after exposure to extremely low frequency magnetic field (ELFMF; 5, 50 and 400 mT). Exposure to 5 mT and 50 mT ELFMF led to a very small increase in the frequency of SCEs, but no significant difference was observed between exposed and unexposed control cells. The cells exposed to 400 mT ELFMF exhibited a significant elevation of the SCE frequencies. There was no significant difference between data from treatments with mitomycin-C (MMC) alone and from combined treatments of MMC plus ELFMF (400 mT) at any MMC concentrations from 4 to 40 nM. These results suggest that exposure to highest-density ELFMF of 400 mT may induce DNA damage, resulting in an elevation of the SCE frequencies. We suppose that there may be a threshold for the elevation of the SCE frequencies, that is at least over the magnetic density of 50 mT.
Insights
Extremely low frequency magnetic fields (ELFMF) at 400 mT significantly increased sister chromatid exchanges (SCEs) in mouse cells, indicating potential DNA damage. Lower ELFMF levels showed no significant effect, suggesting a threshold for genotoxicity.
Area of Science:
- Cell Biology
- Genetics
- Biophysics
Background:
- Sister chromatid exchanges (SCEs) are indicators of DNA damage and chromosomal instability.
- Extremely low frequency magnetic fields (ELFMF) are ubiquitous in modern environments, raising concerns about potential biological effects.
Purpose of the Study:
- To investigate the potential genotoxic effects of ELFMF exposure on cultured mouse cells by examining SCE induction.
- To determine if there is a threshold for ELFMF-induced SCEs.
Main Methods:
- Cultured mouse m5S cells were exposed to varying intensities of ELFMF (5, 50, and 400 mT).
- The frequency of SCEs was quantified in exposed and control cells.
- Cells were also treated with mitomycin-C (MMC) alone and in combination with 400 mT ELFMF to assess synergistic effects.
Main Results:
- Exposure to 5 mT and 50 mT ELFMF resulted in a minor, non-significant increase in SCE frequency.
- A significant elevation in SCE frequency was observed in cells exposed to 400 mT ELFMF.
- No significant difference in SCEs was found between MMC treatment alone and combined MMC plus 400 mT ELFMF treatments.
Conclusions:
- High-intensity ELFMF (400 mT) exposure may induce DNA damage, leading to an increased rate of SCEs in mouse cells.
- A threshold for elevated SCE frequencies appears to exist, likely above 50 mT.
- ELFMF at 400 mT does not appear to potentiate the genotoxic effects of mitomycin-C.