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Cue-induced reinstatement of cocaine seeking in the rat “conflict model”: Effect of prolonged home-cage confinement

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Abstract

Rationale and objectives

Drug addiction is not just the repeated administration of drugs, but compulsive drug use maintained despite the accumulation of adverse consequences for the user. In an attempt to introduce adverse consequences of drug seeking to laboratory animals, we have developed the “conflict model,” in which the access of rats to a reinforcing lever allowing self-administration requires passing of an electrified grid floor. In this model, the current intensity leading to complete abstinence from drug seeking can be measured individually. The present study was designed to evaluated whether reinstatement of drug or natural reward seeking, despite the presence of the electrical barrier, can be achieved by presentation of discrete cues that were associated with the reward, and whether prolonged home-cage confinement can facilitate such reinstatement in this model.

Methods

The “conflict model” was used to test cue-induced reinstatement in the presence of the electrical barrier, after 1 or 14 days of home-cage confinement, in groups of rats that were previously trained to self-administer cocaine or sucrose.

Results

Although similar shock intensity was required to suppress sucrose or cocaine self-administration, subjects exhibited significantly lower response to sucrose-associated as compared to cocaine-associated cues, during the reinstatement test. Importantly, cue-induced reinstatement of cocaine seeking was attenuated following 14 days of home-cage confinement.

Conclusions

The incorporation of aversive consequence in the self-administration model enable detection of what can be interpreted as a compulsive component unique to drug reinforcers. Moreover, the effect of the aversive consequence seems to increase following home-cage confinement.

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Acknowledgement

This research was supported by the by the National Institute on Drug Abuse (NIDA; Grant Number 1R21DA024224-01). We thank D. Goldian for technical assistance. The experimental procedures were approved by the local animal care and use committee and were conducted in accordance with the National Institutes of Health guidelines for the Care and Use of Laboratory Animals.

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The authors declare no conflicts of interests.

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Correspondence to Abraham Zangen.

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Barnea-Ygael, N., Yadid, G., Yaka, R. et al. Cue-induced reinstatement of cocaine seeking in the rat “conflict model”: Effect of prolonged home-cage confinement. Psychopharmacology 219, 875–883 (2012). https://doi.org/10.1007/s00213-011-2416-z

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