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

[ラット精子の運動性に対する携帯電話からの電磁放射の影響] med./bio.

Effects of cellular phone emissions on sperm motility in rats.

掲載誌: Fertil Steril 2007; 88 (4): 957-964

【目的】携帯電話放射ラット精子への影響を評価すること。【方法】16匹の生後3カ月の雄Sprague-Dawleyラット(体重250-300g)を実験群と対照群に分け、実験群は携帯電話放射に毎日(3時間を2回)、18週間ばく露した。精子サンプルについて、精子運動性精子細胞の形態、精子細胞数、2つの細胞表面粘着タンパクのmRNAレベルを評価した。【結果】カイ2乗分析の結果、実験群は対照群に比べ、精子細胞死が顕著に増加したことが示された。また、精子細胞異常な凝集が実験群で見られたが、対照群では見られなかった。【結論】これらの結果は、携帯電話生殖器官に近づけると男性の生殖能力に不利な影響を与える可能性があるかもしれないことを示唆している。

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研究目的(著者による)

To study the effects of mobile phone emissions on rat sperm cells.

詳細情報

Eight rats were exposed to two 3-hour periods of daily mobile phone emissions for 18 weeks; sperm samples were then collected. The sham exposure group also consisted of eight rats.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.9 GHz
ばく露時間: repeated daily exposure, 2 x 3 h/day, for 18 weeks

ばく露1

主たる特性
周波数 1.9 GHz
タイプ
  • electromagnetic field
ばく露時間 repeated daily exposure, 2 x 3 h/day, for 18 weeks
Modulation
Modulation type unspecified
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
Distance between exposed object and exposure source 1 cm
チャンバの詳細 The rats were placed in holding units consisting of ventilated 5.1 cm x 15.2 cm PVC tubes fitted with 0.59-liter clear plastic bottle tops on one end and common 7.6-cm bolts with nuts at the other end. As the rats grew larger, new units were made using 8.9-cm PVC tubes, 1-liter bottles, and 10.2-cm bolts with nuts.
ばく露装置の詳細 Each cell phone was positioned 1 cm from the head of the rats, at equal distances between two rats in holding chambers.
Sham exposure A sham exposure was conducted.
Additional information Rats were exposed for 3 hours, followed by a 30-minute rest period outside of the tubes and a second exposure for 3 more hours per day.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.8 W/kg - 測定値 - AMPS
SAR 0.9 W/kg - 測定値 - CELL
SAR 1.18 W/kg - 測定値 - PCS

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:
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

No significant differences were found in the number of structural sperm mutations between the experimental and the control groups. The total sperm counts from the testes also were not significantly different between the two groups. However, the relative sperm motility and appearance of the sperm from the epididymis in the exposure group differed from those of the control group. The most striking abnormalities in the exposure group were significantly fewer motile sperm cells and numerous clumps of sperm cells.
In the experimental group, an up-regulation was found in the mRNA levels of the two cell surface adhesion proteins, which would create abnormal adhesion of the sperm cells.
After 3 hours of exposure, mean face temperature of the experimental group did not differ from that of the control group. The rectal temperatures of both groups were identical, even after 6 hours of exposure.
These findings suggest that carrying cell phones near reproductive organs could negatively affect male fertility.

研究の種別:

研究助成

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