Mausset A-M, de Seze R, Montpeyroux F, Privat A

Gamma-aminobutyric acid (GABA) is a neurotransmitter in the brain. In this study GABA levels in the cerebellum were measured after rats were exposed to RF radiation. A new technique using immunohistochemical methods and image analysis was used in the GABA measurements. The radiation was at a frequency of 900 MHz, and was either pulsed to simulate GSM emission, with a 576 µs pulse width every 4.6 ms, or was continuous wave (CW). For the GSM type emission, the SAR was 4 W/kg, and for the CW it was 32 W/kg. The rats were exposed to the radiation for 2 hours. For each experiment 12 rats were exposed and 12 sham-exposed. The rats were killed immediately after the exposure, their brains removed, and the cerebella examined.

Both types of radiation were associated with a decrease in the stained processes in the area of Purkinje cells. The CW radiation was also associated with a decrease in the area of stained cells in the molecular area, and in mean optical density in all layers of the cerebellum. These changes all suggest a decrease in GABA content after radiation.

The authors state: "Whether this effect is, at least partly, due to a local heating of the tissues is not known".

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