Abstract
Rationale
Stress exposure has been identified as one risk factor for alcohol abuse that may facilitate the transition from social or regulated alcohol use to the development of alcohol dependence. Additionally, stress is a common trigger for relapse and subsequent loss of control of drinking in alcohol-dependent individuals.
Objectives
The present study was designed to characterize effects of repeated forced swim stress (FSS) on ethanol consumption in three rodent drinking models that engender high levels of ethanol consumption.
Methods
Adult male C57BL/6J mice were exposed to 10-min FSS 4 h prior to each drinking session in three different models of high ethanol consumption: chronic intermittent ethanol (CIE) drinking (a model of dependence-like drinking), drinking-in-the-dark (DID; a model of binge-like drinking), and intermittent vs. continuous access (a model of escalated drinking).
Results
In the CIE drinking paradigm, daily FSS facilitated the escalation of ethanol intake that is typically seen in CIE-exposed mice without altering ethanol consumption in control mice exposed to FSS. FSS prior to drinking sessions did not alter ethanol consumption in the DID or intermittent access paradigms, whereas stressed mice in the continuous access procedure consumed less ethanol than their nonstressed counterparts.
Conclusions
The CIE drinking paradigm may provide a helpful preclinical model of stress-induced transition to ethanol dependence that can be used to (1) identify underlying neural mechanisms that facilitate this transition and (2) evaluate the therapeutic potential of various pharmacological agents hypothesized to alleviate stress-induced drinking.
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Acknowledgments
This work was funded by NIAAA grants P50 AA 10761 (HCB), U01 AA01095 (HCB), and U01 AA020929 (MFL). RIA was supported by T32 AA007474 and F32 AA023700. The authors wish to thank Chelsea Johnson, Joshua Palmer, and India Robbins for technical assistance.
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Anderson, R.I., Lopez, M.F. & Becker, H.C. Forced swim stress increases ethanol consumption in C57BL/6J mice with a history of chronic intermittent ethanol exposure. Psychopharmacology 233, 2035–2043 (2016). https://doi.org/10.1007/s00213-016-4257-2
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DOI: https://doi.org/10.1007/s00213-016-4257-2