Increased cocaine self-administration in M4 muscarinic acetylcholine receptor knockout mice

Rationale The reinforcing effects of cocaine are mediated by the mesolimbic dopamine system. Behavioral and neurochemical studies have shown that the cholinergic muscarinic M-4 receptor subtype plays an important role in regulation of dopaminergic neurotransmission. Objectives Here we investigated for the first time the involvement of M-4 receptors in the reinforcing effects of cocaine using chronic intravenous cocaine self-administration in extensively backcrossed M-4 receptor knockout (M-4(-/-)) mice. Methods We evaluated acquisition of cocaine self-administration in experimentally naive mice. Both cocaine selfadministration and food-maintained operant behavior were evaluated under fixed ratio 1 (FR 1) and progressive ratio (PR) schedules of reinforcement. In addition, cocaine-induced dopamine release and cocaine-induced hyperactivity were evaluated. Results M-4(-/-) mice earned significantly more cocaine reinforcers and reached higher breaking points than their wildtype littermates (M-4(+/+)) at intermediate doses of cocaine under both FR 1 and PR schedules of reinforcement. Under the PR schedule, M-4(-/-) mice exhibited significantly higher response rates at the lowest liquid food concentration. In accordance with these results, cocaine-induced dopamine efflux in the nucleus accumbens and hyperlocomotion were increased in M-4(-/-) mice compared to M-4(+/+) mice. Conclusions Our data suggest that M-4 receptors play an important role in regulation of the reward circuitry and may serve as a new target in the medical treatment of drug addiction.