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

[超低周波電磁界ばく露はサバクトビバッタの行動、生理、ストレスタンパク質レベルを変化させる] med./bio.

Exposure to extremely low frequency electromagnetic fields alters the behaviour, physiology and stress protein levels of desert locusts.

掲載誌: Sci Rep 2016; 6: 36413-

この研究は、サバクトビバッタのような飛翔する昆虫が遭遇しうる送電線近くの高強度の超低周波磁界がその昆虫の行動および生理を変化させるか否かを調べた。複数の磁界レベルのばく露実験を行い、バッタのアクセス可能な神経系に影響が見られるレベルを調査した。その結果、4mTを上回るばく露が歩行低下をもたらす;特定の運動ニューロン(速筋である脛節伸筋運動ニューロン)の細胞内測定により、ばく露バッタにおいてスパイク潜時延長およびスパイク幅の広がりが観察された;ばく露後、脛節伸筋刺激誘発した後脚の蹴り返し力が低下し、ストレスタンパク質レベル(Hsp70)が上昇した、と報告している。

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研究目的(著者による)

The effects of exposure to a 50 Hz magnetic field on the neuro-muscular system and motor activity of locusts should be investigated.

詳細情報

A well-studied insect was used to investigate the effects of strong magnetic fields in close proximity to the high voltage power lines on flying insects.
Locusts were divided into the following groups: exposure to a magnetic field with a magnetic flux density of 1) 1 mT, 2) 4 mT or 3) 7 mT. For each exposure group and test, a separate sham exposure group was used. Different groups with different numbers of locusts were used in the individual tests:

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 50 Hz
ばく露時間: continuous for 24 hours
ばく露2: 50 Hz
ばく露時間: continuous for 24 hours
ばく露3: 50 Hz
ばく露時間: continuous for 24 hours

ばく露1

主たる特性
周波数 50 Hz
タイプ
  • magnetic field
波形
  • sinusoidal
ばく露時間 continuous for 24 hours
ばく露装置
ばく露の発生源/構造
チャンバの詳細 circular glass chamber (15 cm diameter x 7.5 cm height)
ばく露装置の詳細 a coil of 20 cm diameter and composed of 282 turns of insulated copper wire produced a homogeneous, vertical field; glass chamber with 6 locusts was placed inside the coil; temperature during exposure was monitored (at 1 mT, no change was observed (room temperature, 21°C), at 4 mT it was 24.5°C ± 1°C and at 7 mT it was 29.3°C ± 1°C)
Sham exposure A sham exposure was conducted.
Additional information during sham exposure, a hot plate under the coil was used to ensure the same temperature in the glass chamber as during exposure (not necessary for 1 mT)
パラメータ
測定量 種別 Method Mass 備考
磁束密度 1 mT - 測定値 - -

ばく露2

主たる特性
周波数 50 Hz
タイプ
  • magnetic field
波形
  • sinusoidal
ばく露時間 continuous for 24 hours
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 4 mT - 測定値 - -

ばく露3

主たる特性
周波数 50 Hz
タイプ
  • magnetic field
波形
  • sinusoidal
ばく露時間 continuous for 24 hours
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 7 mT - 測定値 - -

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)

Motor activity was significantly reduced in locusts exposed to the 4 mT and 7 mT magnetic fields (groups 2 and 3) compared to the respective sham exposure groups.
The muscle force of the hind leg was significantly decreased in group 3 while the latency and duration of the FETi action potential was significantly increased compared to the sham exposure group.
Protein expression of Hsp70 was significantly increased in metathoracic ganglia of group 3 compared to the sham exposure group.
The authors conclude that exposure to a 50 Hz magnetic field of more than 4 mT might lead to a fatigued neuro-muscular system and reduced motor activity in locusts.

研究の種別:

研究助成

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