PMID- 7696628 OWN - NLM STAT- MEDLINE DCOM- 19950504 LR - 20190718 IS - 0959-4965 (Print) IS - 0959-4965 (Linking) VI - 5 IP - 18 DP - 1994 Dec 20 TI - Spinal serotonin IA and IC/2 receptors mediate supraspinal mu opioid-induced analgesia. PG - 2665-8 AB - 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. FAU - Xu, W AU - Xu W AD - Neuroscience Research Center, Beijing Medical University, China. FAU - Cui, X AU - Cui X FAU - Han, J S AU - Han JS LA - eng PT - Journal Article PL - England TA - Neuroreport JT - Neuroreport JID - 9100935 RN - 0 (Receptors, Opioid, mu) RN - 0 (Receptors, Serotonin) RN - 0 (Serotonin Antagonists) RN - 78995-14-9 (F 7302) RN - UF599785JZ (Fentanyl) SB - IM MH - *Analgesia MH - Animals MH - Brain/*physiology MH - Fentanyl/analogs & derivatives/pharmacology MH - Injections, Intraventricular MH - Injections, Spinal MH - Male MH - Pain Threshold/drug effects MH - Rats MH - Rats, Wistar MH - Reaction Time MH - Receptors, Opioid, mu/*agonists MH - Receptors, Serotonin/classification/*physiology MH - Serotonin Antagonists/pharmacology MH - Spinal Cord/*metabolism EDAT- 1994/12/20 00:00 MHDA- 1994/12/20 00:01 CRDT- 1994/12/20 00:00 PHST- 1994/12/20 00:00 [pubmed] PHST- 1994/12/20 00:01 [medline] PHST- 1994/12/20 00:00 [entrez] AID - 10.1097/00001756-199412000-00065 [doi] PST - ppublish SO - Neuroreport. 1994 Dec 20;5(18):2665-8. doi: 10.1097/00001756-199412000-00065.