To study the biological effects and potential genotoxicity of single or repeated exposures to a 60 Hz magnetic field on human primary fibroblasts and cancer cells.
Exposure | Parameters |
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Exposure 1:
60 Hz
Exposure duration:
continuous for up to 60 min
single exposure
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|
Exposure 2:
60 Hz
Exposure duration:
continuous for 30 min/day on 3 days
repeated exposure
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|
Frequency | 60 Hz |
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Type | |
Exposure duration | continuous for up to 60 min |
Additional info | single exposure |
Exposure source |
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Setup | four permanent magnets forming a plate with a diameter of 15 cm that could move up and down along a spindle so that the distance between the bottom and the magnets varied up to 12 cm; the maximum rotation speed was 1800 rpm; culture plates placed on the bottom of the exposure device which was placed inside an incubator |
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
magnetic flux density | 6 mT | - | measured | - | at a distance of 5 cm between magnets and cell culture plates |
Frequency | 60 Hz |
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Type | |
Exposure duration | continuous for 30 min/day on 3 days |
Additional info | repeated exposure |
Exposure source |
|
---|
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
magnetic flux density | 3 mT | - | measured | - | - |
magnetic flux density | 6 mT | - | measured | - | at a distance of 5 cm between magnets and cell culture plates |
While single exposure to a 60 Hz magnetic field (6 mT) did not affect cell viability in both cell types, treatment induced DNA double-strand breaks and activated DNA damage checkpoint pathway (phospho-checkpoint kinase 2 expression).
However, repetitive exposure to a 60 Hz magnetic field decreased cell viability (IMR90 cells were more sensitive than HeLa cells). Furthermore, the exposure induced persistent p38 MAPK phosphorylation and caspase-dependent apoptosis as well as DNA double-strand breaks.
In conclusion, these data suggest that daily or repetitive exposure to a 60 Hz magnetic field has genotoxic potential in human normal and cancer cells. Thus, the health risks of extremely low frequency magnetic fields of several mT should be further evaluated.
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