この研究は、ヒト神経芽細胞腫BE(2)C細胞を用いて、超低周波パルス化磁界(PMF:1mT、50Hz)ばく露下でH2O2(細胞毒性作用をもつ酸化剤)を投与して1時間放置、その1、24、48、72時間後に、ガンマH2AXフォーカス形成(DNA二重鎖切断の鋭敏なマーカ)、その他の細胞毒性指標の検査および細胞周期分析を実施した。実験結果全体を総合すると、酸化ストレスにより誘導された遺伝毒性および細胞毒性にPMFばく露は何ら影響しないことが示された、と報告している。
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The cytotoxic and genotoxic effects of an exposure of human neuroblastoma cells to a 50 Hz magnetic field with and without co-exposure to hydrogen peroxide should be investigated.
Cells were exposed to the magnetic field or sham exposed for 48 h, then treated with different concentrations of hydrogen peroxide for 1 h and afterwards further exposed to the magnetic field or sham exposed for up to 72 h. The MTT assay was performed in 6 replicates, the gamma-H2AX detection was performed in 3 replicates.
ばく露 | パラメータ |
---|---|
ばく露1:
50 Hz
ばく露時間:
continuous for up to 120 h
|
|
周波数 | 50 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for up to 120 h |
Additional information | a bipolar pulsed-square wave 50 Hz magnetic field was chosen with a duty cycle of 50%; rise time of the square, from peak to peak, was about 0.6 ms, resulting in an average rate of change of magnetic flux density of 3.3 T/s |
ばく露の発生源/構造 | |
---|---|
チャンバの詳細 | cells were exposed in 3cm petri dishes |
ばく露装置の詳細 | two sets of horizontal Helmholtz coils, each of 25 cm diameter, with 40 (20 + 20) turns that were double-wrapped in order to obtain wound (active coil) or counter-wound configuration (sham exposure); active and sham coils were maintained in the same 5% CO2 incubator with a constant temperature of 37°C; samples were placed within a virtual cylinder (about 11 cm in height, and 4 cm in diameter), centered with respect to the coil system |
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | peak | 測定値 | - | ± 2% |
No significant differences were found between exposed and sham exposed cells.
The authors conclude that there is no indication for cytotoxic and genotoxic effects of an exposure of human neuroblastoma cells to a 50 Hz magnetic field. A co-exposure to hydrogen peroxide had no influence on the effects of the magnetic field, either.
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