Abstract
The effects of exogenously added nerve growth factor (NGF) on reaggregation cultures of foetal rat brain cells after X-irradiation with 2 Gy were studied. Irradiation caused decreased protein and DNA levels, which was not prevented by NGF. The activities of the cholinergic marker enzymes choline acetyl transferase and acetylcholine esterase were increased in irradiated cultures. However, no difference in the activities of these enzymes was found between irradiated and unirradiated NGF-treated cultures. Irradiation did not affect the activity of the marker enzyme for oligodendrocytes (2',3'-cyclic nucleotide 3'-phosphodiesterase), but caused an increase in the astrocyte marker (glutamine synthetase) activity. This effect on astrocytes was prevented by NGF.
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