この研究は、8人の患者の半腱様筋および薄筋腱から採取された腱細胞(TC)の初代培養細胞に、低周波パルス電磁界(PEMF;1.5 mT、75 Hz)のばく露をさまざまなばく露時間(4、8、12時間)で与えた。その影響評価のため、腱特異的遺伝子転写(スクレラキシス(SCX)およびI型コラーゲン(COL1A1))の定量的PCR分析を実施した。また、炎症誘発性および抗炎症性サイトカインの放出および血管内皮増殖因子(VEGF)の放出を評価した。その結果、PEMFばく露による細胞毒性的影響は見られなかった;PEMFばく露は、TCの増殖を刺激する可能性が示された;PEMFばく露を受けたTCにおけるSCXおよびCOL1A1の増加はばく露時間と正の相関をした;PEMFの8時間および12時間ばく露を受けたTCにおける抗炎症性サイトカインの放出は、無ばく露対照のTCに比べ、有意に高かったが、炎症誘発性サイトカインの産生は影響を受けなかった;PEMFばく露後、VEGF-AのmRNA転写およびその関連タンパク質の顕著に高い増加が観察された、と報告している。
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To examine the in vitro effects of low frequency pulsed electromagnetic fields on primary human tendon cells.
Tendon samples were obtained from 8 patients. The explants were exposed for 4, 8 or 12 hours and investigated 0, 1, 2, 7 or 10 hours (see "methods") after the exposure.
周波数 | 75 Hz |
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タイプ |
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波形 |
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ばく露時間 | continuous for 4, 8 or 12 hours |
Additional information | pulse duration: 1.3 ms; duty cycle 0.1 |
ばく露の発生源/構造 | |
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チャンバの詳細 | plates with 24 or 96 wells or culture flask |
ばく露装置の詳細 | pair of rectangular horizontal coils (18 x 13 cm), each made of 1000 turns of copper wire, placed opposite to each other; 24-well plates or culture flask were placed between the pair of coils, plane of coils was parallel to culture layer; exposure device placed in 5 % CO2 and 37 °C incubator |
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
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磁束密度 | 1.5 mT | peak | 測定値 | - | +/- 0.2 mT |
No significant differences in cell viability between PEMF-exposed and control cell cultures were observed. Immediately after the exposure, the content of DNA in the 8 hours-exposed group was significantly increased when compared to the control group. After one day, the release of IL-1beta was significantly increased after 12 hours-exposure in comparison to the control, while the release of IL-6 and IL-10 was significantly increased after 8 and 12 hours-exposure. Immediately after 8 and 12 hours-exposure, the release of transforming growth factor-beta and vascular endothelial growth factor-A, as well as the expression of the corresponding gene VEGF-A, was significantly increased.
The data indicate that low frequency pulsed electromagnetic fields are not cytotoxic and could influence the proliferation (not statistically significant), the release of cytokines and alter gene expression in tendon cells.
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