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Influence of some dopaminergic agents on antinociception produced by quinine in mice.
1. The analgesic effect of quinine and the influence of some dopaminergic agents on it were studied in mice. 2. Quinine (25-130mg/kg, ip) effectively elicited antinociceptive effect in a dose related manner. 3. D-Amphetamine (2.5-4mg/kg, ip), L-dopa (25mg/kg, sc), L-dopa (25mg/kg, sc) plus benserazide (12.5mg/kg, sc), alpha-methyl-p-tyrosine (50mg/kg, ip) plus L-dopa (25mg/kg, sc) and pargyline (50mg/kg, ip) significantly attenuated the antinociceptive effect of quinine (50mg/kg, ip), while DOPS (4mg/kg, ip) did not affect quinine antinociception. 4. Pimozide (4mg/kg, ip), L-sulpiride (40mg/kg, ip), SCH 23390 (0.2mg/kg, sc) and alpha-methyl-p-tyrosine (50mg/kg, ip) effectively potentiated the antinociceptive effects of quinine (50mg/kg, ip). 5. Pimozide (4mg/kg, ip) also antagonised the antagonistic effect of d-amphetamine (4mg/kg, ip) on the antinociceptive effect of quinine (50mg/kg, ip). 6. These data indicate that quinine elicited antinociception dose dependently. Furthermore, the influence of pimozide, L-sulpiride and SCH 23390 on quinine antinociception suggests the involvement of dopaminergic mechanisms.
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