この研究は、インビトロでのラットの骨の間葉系間質細胞(BMSC)の神経細胞への分化の誘導に対する電磁界(EMF)の有効性を調べた。SDラットからBMSCを所定の方法で単離し、培養後、所定の密度で細胞を播いた培養皿を3群(分化誘導剤+EMF群、分化誘導剤群、無処置の対照群)準備した。EMFは、50Hz、5mTの磁界で、1日60分間、12日間ばく露した。全ての処置終了後、共焦点顕微鏡による細胞の表現型の観察、RT-PCRによる遺伝子発現の測定、細胞のパッチクランプ法によるシナプス後電流の検出、フローサイトメトリーによる細胞周期と神経細胞マーカが表れる細胞の割合の分析を行った。その結果、EMF処置群では、BMSCの神経細胞への分化が促進された;神経細胞に分化した細胞はシナプス結合を形成し、興奮性のシナプス後電流を発射した;EMF処置群では、G0-G1期の細胞の割合が徐々に低下し、S期の割合および神経細胞マーカが表れる細胞の割合が増加した、と報告している。
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To investigate the influence of 50 Hz-magnetic fields on the differentiation of rat bone mesenchymal stromal cells into neurons.
Three groups of cell cultures were examined: 1.) induction + magnetic field exposure, 2.) induction and 3.) control group (neither exposure nor induction).
For induction, cell cultures were treated with growth factors.
周波数 | 50 Hz |
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タイプ |
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波形 |
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ばく露時間 | 60 min/day for up to 12 days (or 30 min? Contradictory information) |
ばく露の発生源/構造 | |
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ばく露装置の詳細 | dimensions of coils: 40 mm high, 100 mm long, 100 mm inner diameter, 200 mm outer diameter; 200 turns with a radius of 70 mm |
測定量 | 値 | 種別 | Method | Mass | 備考 |
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磁束密度 | 5 mT | - | 測定値 | - | - |
The morphology of the cells changed during the 10 days of observation into neuron-like cells with functional neural electrophysiological activity. Particularly in the exposed group, a high number of neuron-like cells was found when compared to the other groups. Exposed cells showed significantly increased surface protein expression of neuron-specific-enolase compared to the induction group, which indicates a more mature stage. The percentage of cells in the G0 phase and G1 phase was significantly decreased in the exposed group as compared to the other groups, while the percentage of cells in the S-phase was significantly increased. Gene expression of beta-tubulin III, glial fibrillary acidic protein and brain-derived neurotrophic factor was highest in the exposure group and lowest in the control group, while in the induction group, gene expression of these genes was higher than in the control group but lower in comparison to the exposure group. In neither of the groups, gene expression of nestin was observed.
Taken together, the data indicate that exposure to 50 Hz-magnetic fields could promote the differentiation of rate bone mesenchymal stromal cells into functional neurons. Therefore, according to the authors, extremely low frequency magnetic fields could represent a potential therapeutic option for treating neurodegenerative diseases.
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