, Volume 234, Issue 18, pp 2747–2759 | Cite as

Naloxone effects on extinction of ethanol- and cocaine-induced conditioned place preference in mice

  • Laura Font
  • Christa A. Houck
  • Christopher L. Cunningham
Original Investigation



Previous studies found that naloxone (NLX) facilitated choice extinction of ethanol conditioned place preference (CPP) using long (60 min) test sessions, but there is little information on the variables determining this effect.


These studies examined repeated exposure to NLX during extinction of ethanol- or cocaine-induced CPP using both short and long tests.


DBA/2J mice were injected with NLX (0 or 10 mg/kg) before three 10- or 60-min choice extinction tests (experiment 1). All mice received a final 60-min test without NLX. Post-test NLX was given in experiment 2. Experiment 3 tested whether NLX would affect a forced extinction procedure. Experiment 4 tested its effect on extinction of cocaine-induced CPP.


Pre-test (but not post-test) injections of NLX-facilitated choice extinction of ethanol CPP at both test durations. Pre-test NLX also facilitated forced extinction. However, pre-test NLX had no effect on choice extinction of cocaine CPP.


Extinction test duration is not critical for engaging the opioid system during ethanol CPP extinction (experiment 1). Moreover, NLX’s effect does not depend on CPP expression during extinction, just exposure to previously conditioned cues (experiment 3). The null effect of post-test NLX eliminates a memory consolidation interpretation (experiment 2) and the failure to alter cocaine CPP extinction argues against alteration of general learning or memory processes (experiment 4). Overall, these data suggest that the endogenous opioid system mediates a conditioned motivational effect that normally maintains alcohol-induced seeking behavior, which may underlie the efficacy of opiate antagonists in the treatment of alcoholism.


Alcohol Reward Conditioning Extinction Inbred mice (DBA/2J) 



Research reported in this paper was supported by the National Institute on Alcohol Abuse and Alcoholism of the National Institutes of Health under award number R01AA007702. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.


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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Laura Font
    • 1
    • 2
  • Christa A. Houck
    • 1
  • Christopher L. Cunningham
    • 1
  1. 1.Department of Behavioral Neuroscience and Portland Alcohol Research CenterOregon Health & Science UniversityPortlandUSA
  2. 2.Area de PsicobiologíaUniversitat Jaume ICastellónSpain

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