Gamma-hydroxybutyric acid affects the acquisition and reinstatement of cocaine-induced conditioned place preference in mice.
Cocaine addicts very often use different combinations of cocaine and other drugs of abuse such as gamma-hydroxybutyric acid. The objective of the present work was to evaluate the impact of gamma-hydroxybutyric acid administration on the rewarding actions of cocaine, using the conditioned place preference procedure. Cocaine-induced conditioned place preference (50 mg/kg) was studied after pairing this drug with different gamma-hydroxybutyric acid doses (6.25, 12.5, 25, 50 and 100 mg/kg) during either the acquisition or the expression phase of the procedure. After conditioned place preference had been established, and the preference was extinguished, a reinstatement was induced by a dose of cocaine half of that used to produce conditioning, or by gamma-hydroxybutyric acid alone or by both drugs together. The doses of 12.5 and 100 mg/kg of gamma-hydroxybutyric acid blocked the acquisition of cocaine-induced conditioned place preference, and no dose affected the expression of this conditioning. Reinstatement was abolished only with the dose of 25 mg/kg gamma-hydroxybutyric acid, which did not reinstate the preference by itself. This is the first study evaluating the effects of gamma-hydroxybutyric acid on the rewarding properties of cocaine using the conditioned place preference procedure. The principal conclusion of the study is that gamma-hydroxybutyric acid does not enhance the rewarding effect of cocaine, and within a narrow margin of effective doses, blocks the acquisition and reinstatement of cocaine-induced preference.
Department of Psychobiology, Faculty of Psychology, University of Valencia, Avda Blasco Ibáñez 21, 46010 Valencia, Spain.
Concepción
C
Maldonado
Marta
M
Rodríguez-Arias
Ana
A
Castillo
María A
MA
Aguilar
José
J
Miñarro
D018686:Anesthetics, Intravenous / Q000494:pharmacology*; D000818:Animals; D003042:Cocaine / Q000494:pharmacology*; D003216:Conditioning, Operant / Q000187:drug effects*; D018765:Dopamine Uptake Inhibitors / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005108:Extinction, Psychological / Q000187:drug effects; D008297:Male; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D012978:Sodium Oxybate / Q000494:pharmacology*
D018686:Anesthetics, Intravenous; D018765:Dopamine Uptake Inhibitors; D012978:Sodium Oxybate; D003042:Cocaine