Psychopharmacology

, Volume 218, Issue 1, pp 169–177

Ethanol concentration-dependent effects and the role of stress on ethanol drinking in corticotropin-releasing factor type 1 and double type 1 and 2 receptor knockout mice

  • Raúl Pastor
  • Cheryl Reed
  • Sue Burkhart-Kasch
  • Na Li
  • Amanda L. Sharpe
  • Sarah C. Coste
  • Mary P. Stenzel-Poore
  • Tamara J. Phillips
Original Investigation

DOI: 10.1007/s00213-011-2284-6

Cite this article as:
Pastor, R., Reed, C., Burkhart-Kasch, S. et al. Psychopharmacology (2011) 218: 169. doi:10.1007/s00213-011-2284-6

Abstract

Rationale

Exposure to stressors promotes ethanol (EtOH) consumption and enhances drug craving during abstinence. Corticotropin-releasing factor (CRF), and in particular, CRF actions via type 1 CRF receptors (CRF1) are critical in behavioral responses to stressors. CRF1 play a role in EtOH-induced behavioral neuroadaptation, in binge-like EtOH consumption, and in heightened EtOH consumption in dependent animals.

Objectives

We investigated the involvement of CRF1 in swim-stress-induced changes in EtOH consumption and in baseline consumption as a function of EtOH concentration. The role of CRF2 in adapting to effects of the stressor was also examined.

Methods

Wild-type mice and knockout mice lacking CRF1 were tested for two-bottle choice EtOH consumption at concentrations of 3–20%. Also, intake of 10% EtOH was examined in wild-type mice and knockout mice lacking CRF1, or lacking both CRF1 and CRF2, before and after acute or repeated swim stress exposures.

Results

EtOH intake was reduced in CRF1 compared with wild-type mice when presented at a concentration of 20% but not when presented at lower concentrations. No genotype-dependent effects were found for saccharin or quinine drinking. Acute swim stress had no effect, but repeated swim stress resulted in higher levels of EtOH consumption in wild-type mice, compared with both types of knockout mice. Stress effects on EtOH drinking were longer lasting in double knockout mice.

Conclusions

These data suggest a prominent role of CRF1 in stressor-induced changes in EtOH consumption, with involvement of CRF2 in recovery from stressor effects.

Keywords

CRFStressKnockoutAlcoholDrinkingSwim stress

Copyright information

© Springer-Verlag (outside the USA) 2011

Authors and Affiliations

  • Raúl Pastor
    • 1
    • 4
  • Cheryl Reed
    • 1
  • Sue Burkhart-Kasch
    • 1
  • Na Li
    • 1
  • Amanda L. Sharpe
    • 1
  • Sarah C. Coste
    • 2
  • Mary P. Stenzel-Poore
    • 2
  • Tamara J. Phillips
    • 1
    • 3
  1. 1.Behavioral Neuroscience Department and Portland Alcohol Research CenterOregon Health & Science UniversityPortlandUSA
  2. 2.Molecular Microbiology and Immunology DepartmentOregon Health & Science UniversityPortlandUSA
  3. 3.Portland VA Medical CenterPortlandUSA
  4. 4.Area de PsicobiologíaUniversitat Jaume ICastellónSpain