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

[弱い交流磁界印加下のニューロン対に引き起こされる同期現象のダイナミクス] med./bio.

Synchronization dynamics induced on pairs of neurons under applied weak alternating magnetic fields.

掲載誌: Comp Biochem Physiol A Mol Integr Physiol 2013; 166 (4): 603-618

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研究目的(著者による)

To examine the effect of weak alternating magnetic fields on the synchronization dynamics of pairs of snail neurons.

詳細情報

The neurons were dissected from the ganglion of Helix aspersa. 16 sets of neuron pairs were examined. Different sets of experiments were performed:
1.) Electrophysiological recordings: Measuring the neuronal activity while a magnetic field ranging between 1 mT and 15 mT was applied. The magnetic flux density was increased stepwise in 0.05 mT intervals. Additional measurements were performed in the range from 0.02 mT to 2 mT.
2.) Synaptic activity: The magnetic field dependent neuronal activities were compared with the synaptic activity promoted by glutamate and acetylcholine (to investigate the neurotransmitter mediated reaction and the involvement of chemical synapses) and the activity induced by caffeine (increases the intracellular level of Ca2+ (to investigate the calcium mediated reaction)).
3.) Gap junction inhibition: The effect of 0.1, 10 and 100 µM carbenoxolone (blocks gap junctions) was tested under applied magnetic fields to examine the involvement of elctric synapses.

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: each magnetic flux intensity applied for 15 s with 1 min intervals

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 each magnetic flux intensity applied for 15 s with 1 min intervals
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 pair of Helmholtz coils with a diameter of 11 cm, separated by 5.5 cm producing a highly homogeneous field oriented in east-west direction in respect to the brain ganglia (in this direction the measured horizontal component of the magnetic field was ± 0,00 mT; samples placed between the coils; bath temperature was 21°C -23°C, but did not change due to magnetic field exposure (accuray of thermometer ± 0.2°C); exposure setup placed within a Faraday cage
パラメータ
測定量 種別 Method Mass 備考
磁束密度 0.02 mT minimum 測定値 - -
磁束密度 15 mT maximum 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:
調査の時期:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

Under the application of the magnetic field, the existence of a firing bioelectric frequency synchronization was shown in 27% of the tested neuron pairs. The bioelectric frequency synchronization appears at certain magnetic field intensities, dependent on the neuron pair. At higher magnetic flux densities, some of the synchronized neuron pairs become desynchronized.
The firing rate of the neuron pairs was decreased by the magnetic field exposure. This effect was also observed when caffeine and glutamate were added, but not with acetylcholine. This indicates that the magnetic field led to a release of calcium ions in the cytosol of the neurons.
The co-exposure to the magnetic field and carbenoxolone was not able to modify the synchronization.

研究の種別:

研究助成

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