この研究は、培養された頭頂骨の骨芽細胞の増殖および骨形成分化に対する50Hzパルス化電磁界ばく露(PEMFs:1日90分間)の影響を調べた。PEMFsの強度を0.6-3.6mTの範囲で0.6mT刻みで変えた。「一次繊毛にPEMFセンサ機能がある」という仮説を立て、その検証も合わせて実施した。その結果、全ての磁界強度で増殖への影響が見られたが、0.6mT群で最も影響が大きかった;0.6mT群では骨形成効果も最も大きかった;IFT88のsiRNA導入により一次繊毛を抑制した場合、0.6mTでのPEMFsの骨形成促進効果が消失した、と報告している。
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The effects of exposure of rat calvarial osteoblasts to a pulsed 50 Hz magnetic field on cell proliferation and differentiation as well as and the role of primary cilia in this context should be investigated.
Cells were divided into the following groups: exposure to a magnetic field with 1) 0.6 mT, 2) 1.2 mT, 3) 1.8 mT, 4) 2.4 mT, 5) 3.0 mT, 6) 3.6 mT and 7) sham exposure. Additionally, cells with a block in primary cilium formation were created via transfection by siRNA and a resulting suppressed expression of the intraflagellar transport (IFT) protein 88. These cells were exposed to a 0,6 mT magnetic field (group 8).
Each experiment was conducted with n=3 samples per group and was repeated 3 times.
ばく露 | パラメータ |
---|---|
ばく露1:
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
ばく露2:
Modulation type:
pulsed
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
ばく露3:
Modulation type:
pulsed
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
ばく露4:
Modulation type:
pulsed
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
ばく露5:
Modulation type:
pulsed
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
ばく露6:
Modulation type:
pulsed
ばく露時間:
continuous for 90 minutes/day for up to 12 days
|
|
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
ばく露の発生源/構造 | |
---|---|
チャンバの詳細 | 60-mm culture dishes |
ばく露装置の詳細 | solenoid (27 cm long, three series-connected coils and lead tube core cylinder with inner diameter of 100 mm) was placed in a CO2 incubator (5% CO2, 37 °C and 100% humidity); fields had an error of <0.1% horizontally (from 60 to -60 mm) and <0.05% vertically (from 45 to -45 mm) |
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 0.6 mT | - | 測定値 | - | - |
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
Modulation type | pulsed |
---|---|
Duty cycle | 50 % |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1.2 mT | - | 測定値 | - | - |
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
Modulation type | pulsed |
---|---|
Duty cycle | 50 % |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1.8 mT | - | 測定値 | - | - |
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
Modulation type | pulsed |
---|---|
Duty cycle | 50 % |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 2.4 mT | - | 測定値 | - | - |
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
Modulation type | pulsed |
---|---|
Duty cycle | 50 % |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 3 mT | - | 測定値 | - | - |
周波数 |
|
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 90 minutes/day for up to 12 days |
Additional information | 50 Hz pulsed unipolar magnetic field with 50% duty ratio |
Modulation type | pulsed |
---|---|
Duty cycle | 50 % |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 3.6 mT | - | 測定値 | - | - |
Cell proliferation was significantly increased in groups 1-6 compared to the sham exposure group with the most distinct increase in group 1 (0.6 mT).
The parameters for differentiation and mineralization also showed the highest and most distinctly significantly increased values in group 1 in comparison to the sham exposure group without exceptions.
Differentiation and mineralization were significantly reduced in group 8 compared to group 1 and no significant differences could be found compared to the sham exposure group.
The authors conclude that exposure of rat calvarial osteoblasts to a pulsed 50 Hz magnetic field with 0.6 mT might stimulate cell proliferation, differentiation and mineralization and that the primary cilium plays an essential role in mediating this effects.
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