Abstract
Pentobarbitone (50 microM) has been shown to potentiate GABA-induced responses in rat isolated superior cervical ganglia and in dorsal or ventral root fibres of immature rat isolated spinal cords. Measurements of dose ratios for the antagonism of GABA-induced responses of dorsal root fibres by bicuculline showed that pentobarbitone (50 microM) did not significantly alter this antagonism. This result indicates that the antagonism of GABA by bucuculline at dorsal root fibres is not reversed by pentobarbitone. Ventral root responses to GABA (but not glycine) were also potentiated by pentobarbitone (+/-)-Nipecotic acid (300 microM) potentiated responses to GABA much more than those to 3-aminopropane-sulphonic acid.
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