この研究は、ラットを用いた実験で、超低周波磁界（ELF-MF）へのばく露がラットの腎臓、肝臓、脳におけるマンガン（Mn）蓄積に影響するか否かを調べた。40匹のラットをランダムに8群（n = 5）に分けた。4つの対照群は、体重1 kgあたり0、3.75、15、60 mgのMnをそれぞれ、2日に１回、45日間経口投与された。残りの4つのばく露も、それぞれの対照群と同様にMn投与を受け、さらに、ELF-MF（1.5 mT、50 Hz）のばく露を、1日4時間、週5日で、45日間受けた。最後のばく露の後、腎臓、肝臓、脳を摘出し、誘導結合プラズマ発光分析法により各組織のMn蓄積レベルを分析した。その結果、脳、腎臓、肝臓のMnレベルは、対照群に比べ、Mn投与群の方が高かった；また、脳、腎臓、肝臓のMnレベルは、Mn投与群に比べ、Mn投与+ ELF-MFばく露群の方が高かった、と報告している。
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To examine the effects of exposure to an extremely low frequency magnetic field on the accumulation of manganese in the kidney, liver and brain of rats.
To develop neurotoxicity prevention strategies, the effects of metals (for example manganese) on organisms exposed to extremely low frequency magnetic fields should be examined. Therefore, rats were divided into 8 groups (n=5 per group) and received different amounts of manganese every second day for 45 days: 1.) no manganese, 2.) 3.75 mg manganese per kg body weight, 3.) 15 mg manganese per kg body weight and 4.) 60 mg manganese per kg body weight. The rats were exposed or unexposed.
ばく露時間: 4 hours per day on 5 days/week during 45 days
|ばく露時間||4 hours per day on 5 days/week during 45 days|
|チャンバの詳細||rats were housed individually in stainless steel methacrylate cages|
|ばく露装置の詳細||magnetic field was generated by two pairs of Helmholtz coils (70 cm in diameter) in a Faraday cage (130 x 65 x 80 cm); magnet was constructed by winding 125 turns of insulated soft copper wire with a diameter of 1.5 mm; coils were vertically placed facing one another; distance between coils: 47 cm|
In exposed groups, the amount of manganese was significantly higher than in the unexposed groups. Only in the kidney, no significant differences were found between the exposed and the not exposed group which received no manganese.
The data indicate that exposure to an extremely low frequency magnetic field could lead to an accumulation of manganese in the kidney, liver and brain of rats.