title: Spinal and locus coeruleus noradrenergic lesions abolish the analgesic effects of 5-methoxy-N,N-dimethyltryptamine.
abstract: Two experiments were performed on Sprague-Dawley rats to study the effects of noradrenaline and 5-hydroxytryptamine depletion upon the antinociceptive effects of acute 5-methoxy-N,N-dimethyltryptamine (5-MeODMT) administration. 6-Hydroxydopamine-induced lesions following microinjections to either the locus coeruleus or the spinal cord (lumbar) abolished completely 5-MeODMT-induced analgesia in the tail-flick, hot-plate, and shock titration tests whereas 5,7-dihydroxytryptamine-induced lesions of the nucleus raphe magnus and the lumbar spinal cord attenuated 5-MeODMT analgesia in the tail-flick and shock titration tests. Thus, the experiments serve to demonstrate an important interaction between descending noradrenergic and serotonergic pathways, possibly at a spinal locus.
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D008125:Locus Coeruleus / Q000187:drug effects* / Q000503:physiopathology; D008297:Male; D008732:Methoxydimethyltryptamines / Q000494:pharmacology*; D009434:Neural Pathways / Q000187:drug effects; D009638:Norepinephrine / Q000502:physiology*; D010146:Pain / Q000503:physiopathology; D051381:Rats; D011919:Rats, Inbred Strains; D012701:Serotonin / Q000031:analogs & derivatives* / Q000502:physiology*; D013116:Spinal Cord / Q000187:drug effects* / Q000503:physiopathology; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D000700:Analgesics; D008732:Methoxydimethyltryptamines; D012701:Serotonin; D009638:Norepinephrine