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RESEARCH PRODUCT
Pre-treatment with high doses of cocaine decreases the reinforcing effects of cocaine in the conditioned place preference paradigm.
Carmen ManzanedoJosé MiñarroMaría Pilar García-pardoMaría A. AguilarMarta Rodríguez-ariassubject
Pre treatmentMaleAdult maleDose-Response Relationship Drugbusiness.industryGeneral Neurosciencemedicine.medical_treatmentLow doseConditioning ClassicalDrug SynergismDrug TolerancePharmacologyConditioned place preferenceMiceCocaineDrug toleranceHigh dosesMedicineAnimalsbusinessSalinePhysiological salinedescription
The aim of the present study was to determine if pre-exposure to high doses of cocaine can subsequently alter the rewarding effects of this drug. Adult male mice received a pretreatment of physiological saline, or 12.5 or 25 mg/kg of cocaine (one injection a day for five days). After an interval of six days without injections, the rewarding effects of low doses of cocaine (0.5, 1 or 1.5 mg/kg) were evaluated in the conditioned place preference (CPP) paradigm. Doses of 1 and 1.5 mg/kg induced a clear CPP in animals pre-treated with saline but were ineffective in those pre-treated with 25 mg/kg of cocaine. Only the dose of 1.5 mg/kg induced CPP in mice pre-treated with 12.5 mg/kg of cocaine. Our results, which reveal a decrease in the conditioned rewarding effects of threshold doses of cocaine, demonstrate that exposure to high doses of this drug can alter the reward system.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-02-16 | Neuroscience letters |