この研究は、熱ストレスを与えることなしにマイクロ波ばく露を与えた場合、どのような生物学的影響が生じるかを調べた。ニワトリ胚に、非熱的レベルのマイクロ波放射（915 MHz）を与え、細胞がストレスを受けた時に産生されるタンパク質Hsp70の誘導を調べた。その結果、Hsp70のレベルは2時間以内に上昇した；そして、ばく露開始から3時間以内に最大発現（コントロールより約30％高い）に達した；低酸素ストレスを与える前にマイクロ波ばく露を与えた胚では、非ばく露対照群に比べ、再酸素化後の生存率が有意に高かった（P <0.05）；このことは、非熱的レベルのマイクロ波ばく露は、ストレスタンパク質応答経路を活性化するだけでなく、ばく露後に受けた潜在的な致死的ストレス後の生存率をも高めることを示す、と報告している。
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To determine if microwave exposure could elicit a biological effect in the absence of thermal stress, chick embryos were exposed to athermal microwave radiation (915 MHz) to look for induction of Hsp70 and oxidative stress protection.
| 周波数 | 915 MHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | continuous for 30 min |
| ばく露の発生源／構造 | |
|---|---|
| チャンバの詳細 | The Crawford cell having two chambers was mounted vertically on a table in a water-jacketed incubator maintained at 37.8°C. |
| ばく露装置の詳細 | Four eggs were placed vertically in each chamber with their narrow side down using holders on Plexiglas shelves. The MW signal was routed from top to bottom. Control eggs were placed in the same holders outside of the cell but in the same incubator. Matching of the Crawford cell was performed by adjusting the double stub tuner prior to each exposure period using dummy egg samples. |
| Additional information | Temperature increase in the samples was ~1.5°C at 5 W. Positive control was performed by placing eggs in a water-tight bag in a 43°C water bath for 1 h. |
| 周波数 | 30–90 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 30 min |
| Modulation type | cf. additional information |
|---|---|
| Additional information |
random noise |
| ばく露の発生源／構造 | |
|---|---|
| Additional information | For some exposures, superimposed random ELF-EM noise fields (band width 30 to 90 Hz; 20 µT) were applied using Helmholtz coils placed within the incubator and including the Crawford cell within their uniform MF exposure area (see reference article for more details). |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 20 µT | - | - | - | - |
Microwave frequency electromagnetic fields stress embryonic cells and, without causing a significant temperature increase, enhance Hsp70 protein levels. Chick embryos pre-exposed to radiofrequency electromagnetic fields prior to hypoxic stress had significantly higher survival rates after the hypoxic insult than controls.
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