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Psychopharmacology

, Volume 201, Issue 4, pp 569–580 | Cite as

Repeated cycles of chronic intermittent ethanol exposure in mice increases voluntary ethanol drinking and ethanol concentrations in the nucleus accumbens

  • William C. GriffinIII
  • Marcelo F. Lopez
  • Amy B. Yanke
  • Lawrence D. Middaugh
  • Howard C. Becker
Original Investigation

Abstract

Rationale

This study examined the relationship between voluntary ethanol consumption and ethanol concentrations measured in the nucleus accumbens of ethanol dependent and nondependent C57BL/6J mice.

Materials and methods

Mice were offered ethanol in a two-bottle choice; limited access paradigm and consummatory behavior was monitored with lickometers. After baseline intake stabilized, mice received chronic intermittent ethanol (EtOH group) or air (CTL group) exposure by inhalation (16 h/day for 4 days) and then resumed drinking. Brain ethanol levels during voluntary drinking were measured by microdialysis procedures and compared to brain ethanol concentrations produced during chronic intermittent ethanol vapor exposure.

Results

Voluntary ethanol consumption progressively increased over repeated cycles of chronic intermittent ethanol exposure but remained unchanged in CTL mice. Analysis of lick patterns indicated EtOH mice consumed ethanol at a faster rate compared to CTL mice. The greater and faster rate of ethanol intake in EtOH mice produced higher peak brain ethanol concentrations compared to CTL mice, and these levels were similar to levels produced during chronic intermittent ethanol exposure.

Conclusions

These results show that in this model of dependence and relapse drinking, dependent mice exhibit enhanced voluntary ethanol consumption relative to nondependent controls, which consequently produces blood and brain ethanol concentrations similar to those experienced during chronic intermittent ethanol exposure.

Keywords

Ethanol Dependence Withdrawal Self-administration Mice Relapse Microdialysis Brain ethanol levels 

Notes

Acknowledgments

This work was supported by NIH grants AA10716, AA14095, and AA13885. The authors thank Judi S. Randall and Kay Fernandes for excellent technical assistance in conducting this work.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • William C. GriffinIII
    • 1
    • 4
  • Marcelo F. Lopez
    • 1
  • Amy B. Yanke
    • 1
  • Lawrence D. Middaugh
    • 1
    • 2
  • Howard C. Becker
    • 1
    • 2
    • 3
  1. 1.Department of Psychiatry and Behavioral ScienceCharleston Alcohol Research Center, Center for Drug and Alcohol ProgramsCharlestonUSA
  2. 2.Department of NeurosciencesMedical University of South CarolinaCharlestonUSA
  3. 3.Ralph H. Johnson VA Medical CenterCharlestonUSA
  4. 4.Center for Drug and Alcohol Programs, MSC 861Medical University of South CarolinaCharlestonUSA

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