Psychopharmacology

, Volume 201, Issue 3, pp 423–433 | Cite as

Reinstatement of ethanol and sucrose seeking by the neurosteroid allopregnanolone in C57BL/6 mice

  • Deborah A. Finn
  • Gregory P. Mark
  • Andrea M. Fretwell
  • Katherine R. Gililland-Kaufman
  • Moriah N. Strong
  • Matthew M. Ford
Original Investigation

Abstract

Rationale

Recent work in our laboratory documented that the “sipper” method of operant ethanol self-administration produced high ethanol intake and blood ethanol concentrations as well as the typical extinction “burst” in responding under nonreinforced conditions in male C57BL/6 mice. However, the neurochemical basis for reinstatement of responding following extinction has not been examined in mice with this model.

Objectives

Based on findings that the GABAergic neurosteroid allopregnanolone (ALLO) significantly increased the consummatory phase of ethanol self-administration, the present study determined the effect of ALLO on the reinstatement of extinguished ethanol-seeking behavior and compared this effect to the reinstatement of responding for sucrose reward.

Materials and methods

Separate groups of male C57BL/6 mice were trained to lever press for access to a 10% ethanol (10E) or a 5% sucrose (5S) solution. A single response requirement of 16 presses (RR16) on an active lever resulted in 30 min of continuous access to the 10E or 5S solution. After the animals responded on the RR16 schedule for 14 weeks, mice were exposed to 30 min extinction sessions where responding had no scheduled consequence. Once responding stabilized below the preextinction baseline, mice received an intraperitoneal injection of ALLO (0, 3.2, 5.6, 10, or 17 mg/kg) 15 min prior to the extinction session in a within-subjects design.

Results

ALLO produced a dose-dependent increase in responding under nonreinforced conditions in both the 10E and 5S groups. Additional work documented the ability of a conditioned cue light or a compound cue (light+lever retraction) to reinstate nonreinforced responding on the previously active lever.

Conclusions

These findings definitively show that conditioned cues and priming with ALLO are potent stimuli for reinstating both ethanol- and sucrose-seeking behavior in C57BL/6 mice.

Keywords

Operant self-administration GABA Conditioned cues Alcohol Relapse Reward 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Deborah A. Finn
    • 1
    • 2
  • Gregory P. Mark
    • 2
  • Andrea M. Fretwell
    • 1
  • Katherine R. Gililland-Kaufman
    • 2
  • Moriah N. Strong
    • 2
  • Matthew M. Ford
    • 2
  1. 1.VAMC Research (R&D-49)Department of Veterans Affairs Medical CenterPortlandUSA
  2. 2.Department of Behavioral NeuroscienceOregon Health & Science UniversityPortlandUSA

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