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. 1994 Dec 20;5(18):2665-8.
doi: 10.1097/00001756-199412000-00065.

Spinal serotonin IA and IC/2 receptors mediate supraspinal mu opioid-induced analgesia

W Xu  1 , X Cui, J S Han
Affiliations

Spinal serotonin IA and IC/2 receptors mediate supraspinal mu opioid-induced analgesia

W Xu et al. Neuroreport. .

Abstract

Intracerebroventricular (i.c.v.) injection of highly selective mu opioid receptor agonist ohmefentanyl (OMF) to rats produced dose-dependent antinociception as assessed with the tail flick test. This analgesia could be blocked by intrathecal (i.t.) injection of the 5-HT1A receptor antagonist spiperone or the 5-HT1C/2 receptor antagonist mianserin, but not by the 5-HT2 receptor antagonist 1-NP or the 5-HT3 receptor antagonist ICS 205-930. The results suggest that the descending 5-HT system is involved in mediating spinal mu opioid analgesia via spinal 5-HT1A and 5-HT1C/2 receptors.

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