Active vaccination reduces reinforcing effects of MDPV in male Sprague-Dawley rats trained to self-administer cocaine.
Psychopharmacology (Berl)
; 237(9): 2613-2620, 2020 Sep.
Article
in En
| MEDLINE
| ID: mdl-32500210
ABSTRACT
RATIONALE 3,4-Methylenedioxypyrovalerone (MDPV) is a synthetic cathinone abused for its cocaine-like psychostimulant effects in "bath salts" products. While there are currently no pharmacotherapies for MDPV abuse, rodent studies suggest immunotherapy may offer a feasible treatment option. OBJECTIVES:
These studies tested the capacity of active vaccination to reduce the reinforcing effects of MDPV in Sprague-Dawley rats.METHODS:
Rats acquired cocaine self-administration (0.32 mg/kg/inf) on an FR1 schedule. Dose-effect functions for cocaine (0.032-1.0 mg/kg/inf) and MDPV (0.001-0.32 mg/kg/inf) were determined under an FR5 schedule. Rats in the vaccine group were immunized during cocaine self-administration. All rats transitioned to a progressive-ratio (PR) schedule to establish breakpoints for cocaine (0.1-1.0 mg/kg/inf) and MDPV (0.01-0.32 mg/kg/inf). Responding was extinguished, and cue-induced and MDPV-primed reinstatement (0.56 mg/kg, IP) were evaluated.RESULTS:
No endpoints of cocaine self-administration differed between groups, but the ED50 for MDPV self-administration was significantly lower in control relative to vaccinated rats. Under the PR schedule, MDPV was ~ 2.5-fold more potent in maintaining responding in control than vaccinated rats, but Emax was not different between groups. Vaccination did not reduce MDPV-primed reinstatement, perhaps due to a decrease in antibody titer.CONCLUSIONS:
Vaccination did not alter acquisition of cocaine self-administration, demonstrating pharmacological selectivity and suggesting that the vaccine did not affect learning or motivation, while effectively reducing the potency of MDPV as a reinforcer. The protective effects of the vaccine were surmounted by large unit doses of MDPV, suggesting maximal efficacy of drug-conjugate vaccines in substance abuse disorders will likely require concurrent behavior modification therapy.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pyrrolidines
/
Reinforcement, Psychology
/
Vaccination
/
Cocaine
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Dopamine Uptake Inhibitors
/
Benzodioxoles
Limits:
Animals
Language:
En
Journal:
Psychopharmacology (Berl)
Year:
2020
Document type:
Article
Affiliation country: