この研究は、パルス電磁界(PEMF)の周波数、ばく露時間が末梢神経再生に与える影響を細胞およびラットで実験した。細胞実験では、ラットの不死化シュワン細胞株(iSCs)を4群に分けた:50Hzで1時間/日、50Hzで12時間/日、150Hzで1時間/日、 150Hzで12時間/日。強度は全て1mT。ばく露終了後に、細胞増殖、S100および脳由来神経栄養因子(BDNF)のmRNA 発現を分析した。ラット実験では、SDラットを6群に分けた(各群n=10):対照群、擬似ばく露群、50Hzで1時間/日、50Hzで12時間/日、150Hzで1時間/日、 150Hzで12時間/日の1mTばく露群。おとがい神経を圧挫損傷させた後に各条件のばく露を開始した。ばく露終了後、機能検査、組織形態学的測定、三叉神経節の逆行性ラベリングで神経再生を評価した。その結果、PEMFは末梢神経再生を増強し、それは細胞増殖、S100およびBDNFの遺伝子発現による可能性が示された、と報告している。
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The effects of exposure to pulsed extremely low frequency magnetic fields of different frequencies and durations on the peripheral nerve regeneration in rats and cell proliferation in Schwann cells should be investigated.
The study comprised in vitro tests with immortalized Schwann cells of rats and in vivo tests with rats.
For the in vitro tests, cells were divided into 5 groups: exposure to a pulsed magnetic field of 1) 50 Hz for 1 hour/day, 2) 50 Hz for 12 hours/day, 3) 150 Hz for 1 hour/day, 4) 150 Hz for 12 hours/day and 5) control group.
For the in vivo tests, chin nerves of rats were crush injured between lip area and mental foramen (except in the sham group) and the animals were divided into 6 groups (n=10 each): exposure to a pulsed magnetic field of 6) 50 Hz for 1 hour/day, 7) 50 Hz for 12 hours/day, 8) 150 Hz for 1 hour/day, 9), 150 Hz for 12 hours/day, 10) control group, 11) sham group without injury and magnetic field exposure.
ばく露 | パラメータ |
---|---|
ばく露1:
50 Hz
ばく露時間:
1 hour/day for up to 3 weeks
in vitro exposure
|
|
ばく露2:
50 Hz
ばく露時間:
12 hours/day for up to 3 weeks
in vitro exposure
|
|
ばく露3:
150 Hz
ばく露時間:
1 hour/day for up to 3 weeks
in vitro exposure
|
|
ばく露4:
150 Hz
ばく露時間:
12 hours/day for up to 3 weeks
in vitro exposure
|
|
ばく露5:
50 Hz
ばく露時間:
1 hour/day for 3 weeks
in vivo exposure
|
|
ばく露6:
50 Hz
ばく露時間:
12 hours/day for 3 weeks
in vivo exposure
|
|
ばく露7:
150 Hz
ばく露時間:
1 hour/day for 3 weeks
in vivo exposure
|
|
ばく露8:
150 Hz
ばく露時間:
12 hours/day for 3 weeks
in vivo exposure
|
|
no details given on pulse repetition rate and pulse width
周波数 | 50 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 1 hour/day for up to 3 weeks |
Additional information | in vitro exposure |
ばく露の発生源/構造 | |
---|---|
チャンバの詳細 | coils in incubator |
ばく露装置の詳細 | two identical Helmholtz coils of 30 cm diameter, 7 cm width and 15 cm distance; vertical field |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 50 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 12 hours/day for up to 3 weeks |
Additional information | in vitro exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 150 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 1 hour/day for up to 3 weeks |
Additional information | in vitro exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 150 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 12 hours/day for up to 3 weeks |
Additional information | in vitro exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 50 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 12 hours/day for 3 weeks |
Additional information | in vivo exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 150 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 1 hour/day for 3 weeks |
Additional information | in vivo exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 150 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | 12 hours/day for 3 weeks |
Additional information | in vivo exposure |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
In the in vitro tests, group 1 (50 Hz exposure for 1 hour/day) showed a significantly increased cell proliferation after 4-7 days and a significantly increased gene expression of S100 and BDNF after 1-3 weeks compared to the control group.
In the in vivo tests, the difference score was significantly decreased after 2 and 3 weeks and the gap score was significantly decreased after 3 weeks in group 6 (50 Hz exposure for 1 hour/day) compared to the control group (group 10), indicating an improved sensory function.
A significantly increased number of axons and retrograde labeled neurons was found in all exposure groups (groups 6-9) compared to the control group, with the highest values found in group 6.
The authors conclude that exposure to a pulsed 50 Hz magnetic field for 1 hour/day might be beneficial in peripheral nerve regeneration via increase in cell proliferation and BDNF and S100 gene expression. Hence, these could also be suitable exposure conditions in clinical applications.
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