RESUMO
OBJECTIVE: To study the effect of GABA transporter (GAT-1) on the analgesic action of oxysophoridine (OSR) in the central nervous system of mice. METHOD: Hot plate test was used to observe and analyze the effect of gamma aminobutyric acid and the inhibitor of GAT-1 (NO-711) on the analgesic action of oxysophoridine. Real time RT-PCR was used to investigate the influence of OSR on the expression of GAT-1 mRNA induced by formalin in spinal cord and brain of mice. RESULT: Both GABA (2.0 mg x kg(-1), icv) and NO-711(0.125 mg x kg(-1), icv) enhanced the analgesic action of OSR (32.0 mg x kg(-1), iv) in the hot plate test, and the latencies was markedly increased (P < 0.05, P < 0.01). OSR (500.0 mg x kg(-1), iv) significantly inhibited the expression of GAT-1 mRNA induced by formalin (P < 0.05). CONCLUSION: GAT-1 was involved in the analgesia effect of OSR and the down-regulation of GAT-1 mRNA enhanced the analgesic effect.
