【目的】ラットの脳から摘出した視床下部室傍核(PVN)に対するマイクロ波放射の影響を調べること。【方法】GTEMセル内で2.45GHz電磁界放射に1回ばく露または反復(2週間に10回)ばく露したラットの細胞活性化のパターンを調べるためにc-Fos発現を利用した。電力強度は3Wおよび12Wとし、FDTD法により比吸収率(SAR)を計算した。【結果】高いSARは、ばく露から90分後または24時間後のc-Fosマーカの上昇を引き起こす引き金となり、低いSARでは、24時間後のc-Fosの数が対照群のものより多かった。3Wへの反復ばく露群では、急性ばく露群および擬似の反復ばく露群に比べ、PVN の細胞活性化が100%以上上昇した。【結論】PVNは非熱的なSARレベルの2.45GHzのマイクロ波放射に影響されやすいことを、今回の結果は示した。
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To study the effects of radiofrequency exposure resulting in non-thermal (< 4 W/kg) specific absorption rates on c-Fos expression in the paraventricular nucleus (of the hypothalamus) of rats.
60 female rats were divided into the following groups: 1) 20 rats were divided into three subgroups and exposed at 0, 3 and 12 W for 30 min. The rats were killed 90 min following exposure (when maximum c-Fos protein expression occurs). 2) 20 rats were divided into three subgroups and exposed at 0, 3 and 12 W for 30 min. The rats were killed 24 h following exposure. 3) 20 rats were exposed at 3 W for 30 min per day for a total of ten times in a two week period.
ばく露 | パラメータ |
---|---|
ばく露1:
2.45 GHz
ばく露時間:
continuous for 30 min
|
|
ばく露2:
2.45 GHz
ばく露時間:
continuous for 30 min/day on 10 times during 2 weeks
|
|
ばく露3:
2.45 GHz
ばく露時間:
continuous for 30 min
|
周波数 | 2.45 GHz |
---|---|
タイプ |
|
ばく露時間 | continuous for 30 min |
ばく露の発生源/構造 |
|
---|---|
ばく露装置の詳細 | rat immobilized in a methacrylate cylinder placed in the area of maximum field uniformity in the GTEM cell |
Sham exposure | A sham exposure was conducted. |
周波数 | 2.45 GHz |
---|---|
タイプ |
|
ばく露時間 | continuous for 30 min/day on 10 times during 2 weeks |
ばく露の発生源/構造 |
|
---|---|
Sham exposure | A sham exposure was conducted. |
周波数 | 2.45 GHz |
---|---|
タイプ |
|
ばく露時間 | continuous for 30 min |
ばく露の発生源/構造 |
|
---|---|
ばく露装置の詳細 | rat immobilized in a methacrylate cylinder placed in the area of maximum field uniformity in the GTEM cell |
Sham exposure | A sham exposure was conducted. |
A high SAR value induced an increase of the c-Fos expression 90 min or 24 h after exposure, and a low SAR value resulted in higher c-Fos expression than in control rats after 24 h. Repeated irradiation at 3 W increased cellular activation of the paraventricular nucleus by more than 100% compared to animals subjected to acute exposure or to repeated sham exposed animals.
The data suggest that the paraventricular nucleus is sensitive to 2.45 GHz microwave exposure at non-thermal SAR levels.
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