Journal of Neural Transmission 2003-11-01

The interaction of tetrahydroisoquinoline derivatives with antinociceptive action of morphine and oxotremorine in mice.

J Vetulani, F Pavone, B Przewłocka, V Borghi, I Nalepa

Index: J. Neural Transm. Gen. Sect. 110(11) , 1205-13, (2003)

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Abstract

To extend our earlier data on synergistic action of tetrahydroisoquinolines and morphine, we have investigated the analgesic effects of 1,2,3,4-tetrahydroisoquinoline (TIQ) and its 1-methyl-(1-MeTIQ) and N-methyl (N-MeTIQ) analogs on analgesia induced by morphine and oxotremorine. 1-MeTIQ and N-MeTIQ induced a moderate, delayed and prolonged analgesic action measured in the tail-flick test in CD-1 mice; 1-MeTIQ and TIQ prolonged the opiate (morphine, 2.5 mg/kg i.p.) analgesia while TIQ and N-TIQ potentiated cholinergic (oxotremorine, 0.02 mg/kg i.p.) analgesia. The involvement of the opioid and noradrenergic systems in this effect is discussed.