この研究は、確立されたアルツハイマー病(AD)および筋萎縮性側索硬化症(ALS)のマウスモデルであるAPP23マウスおよびSOD1マウスに、低周波磁界(LF-MF:50 Hz、1 mT)の長期ばく露(16ヶ月)を与え、学習障害、生存率などへの影響を調べた。その結果、APP23マウスの学習障害は長期ばく露によって悪化しなかった;SOD1マウスでの発病および生存率への影響も見られなかった、と報告している。
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The effects of a chronic exposure of mice to a 50 Hz magnetic field on the development of Alzheimer's disease and amyotrophic lateral sclerosis should be investigated.
APP23 mice with an overexpression of the amyloid precursor protein (APP) were used as a model for early onset of Alzheimer's disease. SOD1G85R and SODG93A mice with an overexpression of mutant superoxide dismutase 1 (SOD-1) were used as models for amyotrophic lateral sclerosis. SOD1WT mice, overexpressing human wild type SOD-1, were used as negative controls for the SOD mutation. All mice were 2 month old when the experiment started.
The following groups were used: 1) APP23 mice exposed to the magnetic field (n=?), 2) sham exposed APP23 mice (n=?), 3) SOD1G85R mice exposed to the magnetic field (n=135), 4) sham exposed SOD1G85R mice (n=138), 5) SOD1G93A mice exposed to the magnetic field (n=122), 6) sham exposed SOD1G93A mice (n=110), 7) non-exposed SOD1WT mice (n=?), 8) non-exposed non-transgenic littermates (n=?).
ばく露 | パラメータ |
---|---|
ばく露1:
50 Hz
ばく露時間:
continuous for 16 months
|
|
周波数 | 50 Hz |
---|---|
タイプ |
|
ばく露時間 | continuous for 16 months |
ばく露の発生源/構造 |
|
---|---|
チャンバの詳細 | cages without metal |
ばく露装置の詳細 | several mouse cages were placed in one module on three levels within the homogeneous field; Merritt coils consisted of two coils of 26 and 11 turns each which were connected in series; the cable consisted of five wires with a total cross-section area of 16 mm2; wires were wrapped in aluminum foil to block electric fields; exposure units were shielded to prevent fringing |
Sham exposure | A sham exposure was conducted. |
Additional information | modules for sham exposure looked identical to the modules for exposure, but wires were turned after half of the turns |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | 測定値 | - | - |
No significant differences were found in any parameter between exposed and sham exposed animals of all strains, respectively.
The authors conclude that chronic exposure of mice to a 50 Hz magnetic field has no effects on the development, course or symptoms of Alzheimer's disease and amyotrophic lateral sclerosis.
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