研究のタイプ: 医学/生物学の研究 (experimental study)

[H9c2細胞の模擬的虚血-再灌流への反応における磁界の前処理法による細胞生存の増強およびアポトーシス応答の減少] med./bio.

Enhanced cell survival and diminished apoptotic response to simulated ischemia-reperfusion in H9c2 cells by magnetic field preconditioning.

掲載誌: Apoptosis 2012; 17 (11): 1182-1196

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研究目的(著者による)

To investigate the potential for preconditioning with extremely low frequency magnetic fields to protect heart derived cells from damage by simulated ischemia and re-perfusion.

詳細情報

Re-perfusion (reconstitution of the blood perfusion) of the heart after ischemia leads to severe cardiomyocyte injury (see Ma et al. 2013).
Cells were preconditioned with magnetic fields for 0, 2, 4, 6, or 8 hours. Afterwards, they were submitted to a hypoxia/reoxygenation treatment which simulates the ischemia and the re-perfusion.
To test whether the expression level of Hsp25 and the enzyme activities of caspases 3, 8, and 9 are dependent on the activity of the p38 mitogen activated protein kinase, an inhibitor (SB203580) was partially added to the culture medium.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 60 Hz
ばく露時間: continuous for 2, 4, 6, 8 h

ばく露1

主たる特性
周波数 60 Hz
タイプ
  • magnetic field
ばく露時間 continuous for 2, 4, 6, 8 h
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 Helmholtz coils with a diameter of 38.1 cm (15 inch) vertically oriented and housed inside a water-jacketed cell culture incubator with a constant temperature of 37°C and 5% of CO2; depth of culture medium over the cells maintained at 5 mm
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 1 µT minimum 測定値 - -
磁束密度 3 µT - 測定値 - -
磁束密度 7.5 µT - 測定値 - -
磁束密度 15 µT - 測定値 - -
磁束密度 30 µT - 測定値 - -
磁束密度 60 µT - 測定値 - -
磁束密度 120 µT - 測定値 - -
磁束密度 240 µT maximum 測定値 - -

Reference articles

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

In magnetic field preconditioned cells (4-8 hours), the cell viability was significantly increased compared to cells submitted to hypoxia/reoxygenation treatment without preconditioning. A magnetic flux density of 120 µT resulted in the highest cell viability and therefore further experiments were performed with this intensity.
The protein expression level of Bcl-2 was significantly increased after preconditioning with 4 and 6 hours exposure and the enzyme activities of the caspases 3, 8, and 9 were significantly decreased (4-8 hours exposure) in comparison to cells without preconditioning. No mentionable effect of magnetic field exposure on the expression of the heat shock proteins Hsp25, Hsp32 and Hsp72 was observed (no data are given for Hsp27). However, preconditioning with magnetic fields (4-8 hours) led to a significant decrease (77%) in the hypoxia/reoxygenation induced translocation of phosphorylated Hsp25 from the cytosolic to the nuclear-cytoskeletal fraction. An addition of the p38 mitogen activated protein kinase-inhibitor SB203580 (blocks the phosphorylation of Hsp25) to the magnetic field preconditioned cells resulted in a significant increase in the enzyme activity of caspase 3 compared to the magnetic field preconditioned cells without inhibitor. Hence, the magnetic field induced reduction of the activity of the caspase 3 was diminished by the inhibitor SB203580.
The authors conclude that preconditioning with extremely low frequency magnetic fields could protect heart cells from damage by simulated ischemia and re-perfusion.

研究の種別:

研究助成

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