研究のタイプ: 医学/生物学の研究 (experimental study)

[ラットの子宮内膜での900 MHzラジオ周波数場で誘導される組織病理的変化と酸化ストレス:ビタミンEとCによる防御] med./bio.

900 MHz radiofrequency-induced histopathologic changes and oxidative stress in rat endometrium: protection by vitamins E and C.

掲載誌: Toxicol Ind Health 2007; 23 (7): 411-420

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研究目的(著者による)

It should be examined whether oxidative stress has an important role in 900 MHz mobile phone induced endometrial damage and to investigate the role of the antioxidant vitamins E and C on endometrial tissue in rats.

詳細情報

Altogether thirty-two sexually mature female rats (16 weeks old, 170-200 g) were used. Vitamin E and vitamin C were injected as doses of 50 mg/kg body weight intramuscularly and 20 mg/kg body weight intraperitoneally, respectively, before the daily exposure period. In control rats isotonic saline solution was administered. At the end of the study, control and exposed animals were waited for the onset of estrus, than the animals were sacrificed and their uterus examined.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: repeated daily exposure, 30 min/day, for 30 days

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 repeated daily exposure, 30 min/day, for 30 days
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 A special exposure device with exposure antenna for insulated exposure was used in the study. The exposure system for an animal consisted of a ventilated plastic tube cage (12 cm long, 5 cm in diameter) and a half-wave dipole antenna above which the whole body of the rat was positioned in close contact.
Sham exposure A sham exposure was conducted.
Additional information The animals (eight each) were randomly allocated to one of four groups: control, sham exposed, RF exposed, and RF exposed plus vitamin treated.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力密度 1.04 mW/cm² - 測定値 - -
SAR 4 W/kg maximum 測定値 whole body -
SAR 0.016 W/kg minimum 測定値 whole body -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

Endometrial levels of nitric oxide and malondialdehyde increased in exposed rats while the combined vitamins E and C caused a significant reduction in the levels of nitric oxide and malondialdehyde. Likewise, endometrial superoxide dismutase, catalase, and glutathione peroxidase activities decreased in exposed animals while vitamins E and C caused a significant increase in the activities of these antioxidant enzymes. In the exposure group histopathological changes in endometrium, diffuse and severe apoptosis, was present in the endometrial surface epithelial and glandular cells and the stromal cells. Diffuse eosinophilic leucocyte and lymphocyte infiltration were observed in the endometrial stroma whereas the combination of vitamins E and C caused a significant decrease in these effects of electromagnetic irradiation.
In conclusion, oxidative endometrial damage plays an important role in the 900 MHz mobile phone-induced endometrial impairment and the modulation of oxidative stress with vitamins E and C reduces the 900 MHz mobile phone-induced endometrial damage both at biochemical and histological levels.

研究の種別:

研究助成

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