Abstract
Rationale
Tramadol, (1RS,2RS)-2-[(dimethylamine)-methyl]-1-(3-methoxyphenyl)-cyclohexanol hydrochloride, is an atypical analgesic which binds weakly to ì-opioid receptors and enhances the extra-neuronal concentration of noradrenaline and serotonin by interference with both the uptake and release mechanisms.
Objectives
The present study was undertaken to evaluate the potential role of 5-HT1A and 5-HT1B receptors on the analgesic and antidepressant-like effect of tramadol.
Methods
The effect of either a selective 5-HT1A receptor antagonist (WAY 100635; N-2-[4-(2-methoxyphenyl-1-piperazinyl]ethyl]-N-2-pyridinylcyclohexane carboxamide; 0.2–0.8, 8 mg/kg) or a selective 5-HT1B receptor antagonist (SB 216641; N-[3-(3-dimethylamino) ethoxy-4-methoxyphenyl]-2′-methyl-4′-(5-methyl-1,2,4-oxadiazol-3-yl)-(1,1′-biphenyl)-4-carboxamide; 0.2–0.8, 8 mg/kg) was investigated in mice in combination with tramadol by means of the hot-plate test, a phasic nociceptive model, and the forced swimming test, a paradigm aimed at screening potential antidepressants.
Results
The results showed that WAY 100635 enhanced the antinociceptive effect and produced a large decrease in the antidepressant-like effect of tramadol. In contrast, SB 216641 did not significantly modify either the analgesic or the antidepressant-like effects of tramadol.
Conclusions
These findings suggest that 5-HT1A receptors modulate the analgesic and the antidepressant-like effects of tramadol in differing ways. The results suggest the involvement of the 5-HT1A autoreceptors from the raphe nuclei and spinal 5-HT1A receptors in the antinociceptive effect. In contrast, the 5-HT1A receptors located in the forebrain may be responsible for the blockade of the antidepressant-like effect of tramadol. 5-HT1B receptors seem not to modify these effects in the models investigated.
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Acknowledgements
This study has been supported by “Fondo de Investigación Sanitaria” (PI031430) and “Plan Andaluz de Investigación” (CTS-510).
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Berrocoso, E., Rojas-Corrales, M.O. & Mico, J.A. Differential role of 5-HT1A and 5-HT1B receptors on the antinociceptive and antidepressant effect of tramadol in mice. Psychopharmacology 188, 111–118 (2006). https://doi.org/10.1007/s00213-006-0464-6
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DOI: https://doi.org/10.1007/s00213-006-0464-6