この研究は、GSM携帯電話からの電磁放射へのヒト赤血球のインビトロばく露がヘモグロビン放出を変化させるか否かを調べた。放出ヘモグロビンレベルは、膜の脆弱性の増加によって引き起こされる溶血の指標となる。2つの異なる細胞濃度（ヘマトクリット20％および40％）の赤血球懸濁液に、GSM携帯電話（搬送周波数902 MHzのパルス波、出力2 W）からの電磁放射ばく露を、20分間、電話機のアンテナに対して2つの異なる位置で与えた。位置1は方位角アンテナパターンの主ローブの中心点、位置2は主ローブとバックローブの間の点である。溶血の変化は、ばく露後の経過時間0、10、20、30、40、50および60分において測定した。溶血は、懸濁液を遠心分離して得られた上清中のヘモグロビンの吸光度（413 nm）として得られたヘモグロビン濃度で表された。その結果、GSM900 EMFのばく露を受けた懸濁液中のヘモグロビンレベルは減少を示した；GSM900 EMFへのばく露は、そのEMFパラメータ、懸濁液の含水量（ヘマトクリット）、およびばく露後の経過時間に依存して、溶血の減少を引き起した、と報告している。
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This in vitro study was performed to evaluate the effects of GSM 900 MHz electromagnetic field exposure on the membrane stability of human erythrocytes, their dependence on the suspension water content and on the time elapsed after irradiation.
Erythrocyte suspensions with two different concentrations (hematocrit 20% and 40 %) were investigated. They were exposed in two different positions, position 1 in the centre of the mobile phone irradiation and position 2 in a region of minimal irradiation. The experiments were carried out at room temperature and the temperature of the erythrocyte suspension was not controlled.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
902 MHz
Modulation type:
pulsed
ばく露時間:
continuous for 20 min
|
|
| 周波数 | 902 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 20 min |
| Modulation type | pulsed |
|---|---|
| Pulse width | 577 µs |
| Additional information |
standard GSM frame of 4.615 ms duration with discontinuous transmission mode (DTX) deactivated |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 1 m |
| ばく露装置の詳細 | cell suspension was either placed in the center of the major lobe of the antenna pattern (maximum irradiation) or between the major and the back lobe (minimum irradiation) |
| Additional information | to measure the radiation pattern of the mobile phone it was placed on a rotating turntable and a dipole antenna placed level to it at a distance of 5 m; the turntable was rotated 360° and the response between antennas measured as a function of angle; measurements were performed in a free-space environment |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力 | 2 W | peak | - | - | - |
The amount of the released hemoglobin increased with the time elapsed after the exposure to electromagnetic fields both in the control and exposed erythrocytes. Exposed erythrocytes showed decreased hemolysis. The hemolysis decrease was more pronounced in position 1. Effects of electromagnetic fields appeared 10 minutes after exposure and differences retained 30 minutes in erythrocyte suspension with a hematocrit of 20%. The exposure of erythrocyte suspensions with hematocrit 40% caused statistically significant decrease of the hemolysis in all investigated time intervals.
These results indicate that the exposure to 900 MHz electromagnetic field probably stabilize the erythrocyte membrane reflected by decreased hemolysis.
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