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The effects of a chronic exposure of rats to a 900 MHz electromagnetic field on spatial memory and the neural structure in the hippocampus should be investigated.
Rats were divided into the following groups: 1) exposure to the electromagnetic field (n=24), 2) sham exposure (n=24) and 3) cage control (n=24).
|ばく露時間||continuous for 1 h/day for 28 days|
|チャンバの詳細||polypropylene cages (41 Œ 28 Œ 14 cm)|
|ばく露装置の詳細||an activated mobile phone (silent mode, giving unattended calls (50 calls/h) with the help of an auto dialer) was inserted in a wire mesh cage (12 Œ 7 Œ 7 cm) and placed at the center of the animal cage (n=3 rats per cage)|
|Sham exposure||A sham exposure was conducted.|
There were no significant differences in the body weight between the groups.
Learning and the spatial memory were significantly deteriorated in rats exposed to the electromagnetic field compared to cage control and sham exposure groups.
No cellular aggregates were found in any group, but neuronal cell viability was significantly decreased in exposed rats compared to cage control and sham exposure rats. Moreover, pyramidal cells of exposed rats showed significantly less dendritic arborization compared to the cage control group.
The authors conclude that chronic exposure of rats to a 900 MHz electromagnetic field could impair spatial memory and the neural structure in the hippocampus and they propose a causal relationship.