BACKGROUND: The recreational drug, Salvinorin A, derived from the plant of Salvia divinorum, is a potent and selective kappa-opioid receptor agonist. The abuse of selective k-agonists is a novel phenomenon, the mechanism of which is not fully understood. METHODS: We investigated salvinorin A given SC on the conditioned place preference (.05-160 microg/kg) and intracerebroventricular (ICV) self-administration (.01-1 microg/infusion) paradigms, in Wistar rats. RESULTS: The present results demonstrate the rewarding effects of Salvinorin A in a range of doses between .1 and 40 microg/kg SC for conditioned place preference test and .1-.5 microg/infusion for ICV self-administration. Highest doses (160 microg/kg for conditioned place preference test and 1 microg/infusion for ICV self-administration) were aversive. The rewarding effect was antagonized by intraperitoneal (IP) pretreatment with the cannabinoid CB(1) receptor antagonist, rimonabant [N-piperidino-5-(4-chlorophenyl)1-(2,4-dichloro phenyl)-4 methyl pyrazole 3-carboxamide] (1 mg/kg), and the kappa-opioid receptor antagonist, nor-binaltorphimine (nor-BNI) (10 mg/kg). In the shell of nucleus accumbens, dopamine extracellular levels were increased after administration of salvinorin A (40 microg/kg SC), reaching a maximum value of about 150%. CONCLUSIONS: These data provide the demonstration of the rewarding effects of Salvinorin A through an interaction between kappa-opioid and (endo)cannabinoid system in rats.
Involvement of kappa-opioid and endocannabinoid system on Salvinorin A-induced reward / D. Braida, V. Limonta, V. Capurro, P. Fadda, C. Castiglioni, T. Rubino, P. Mascia, A.D. Zani, E. Gori, W. Fratta, M. Sala. - In: BIOLOGICAL PSYCHIATRY. - ISSN 0006-3223. - 63:3(2008 Feb 01), pp. 286-292.
|Titolo:||Involvement of kappa-opioid and endocannabinoid system on Salvinorin A-induced reward|
BRAIDA, DANIELA (Primo)
LIMONTA, VALERIA (Secondo)
SALA, MARIAELVINA (Ultimo)
|Parole Chiave:||conditioned place preference ; dopamine ; kappa-Opioid receptor ; microdialysis ; self-administration ; SR 141716A|
|Settore Scientifico Disciplinare:||Settore BIO/14 - Farmacologia|
|Data di pubblicazione:||1-feb-2008|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.biopsych.2007.07.020|
|Appare nelle tipologie:||01 - Articolo su periodico|