Abstract
Rationale
Exposure to inescapable stressors increases both the rewarding properties and self-administration of cocaine through the signaling of the kappa-opioid receptor (KOR), but the effect of this signaling on other reinforcing agents remains unclear.
Objective
The objective of this study is to test the hypothesis that signaling of the KOR mediates the forced swim stress (FSS)-induced potentiation of ethanol reward and self-administration.
Methods
Male C57Bl/6J mice were tested in a biased ethanol-conditioned place preference (CPP) procedure, and both C57Bl/6J and prodynorphin gene-disrupted (Dyn −/−) mice were used in two-bottle free choice (TBC) assays, with or without exposure to FSS. To determine the role of the KOR in the resulting behaviors, the KOR agonist U50,488 (10 mg/kg) and antagonist nor-binaltorphimine (nor-BNI, 10 mg/kg) were administered prior to parallel testing.
Results
C57Bl/6J mice exposed to repeated FSS 5 min prior to daily place conditioning with ethanol (0.8 g/kg) demonstrated a 4.4-fold potentiation of ethanol-CPP compared to unstressed mice that was prevented by nor-BNI pretreatment. Likewise, pretreatment with U50,488 90 min prior to daily ethanol place conditioning resulted in a 2.8-fold potentiation of ethanol-CPP. In the TBC assay, exposure to FSS significantly increased the consumption of 10% (v/v) ethanol by 19.3% in a nor-BNI-sensitive manner. Notably, Dyn −/− mice consumed a similar volume of ethanol as wild-type littermates and C57Bl/6J mice, but did not demonstrate significant stress-induced increases in consumption.
Conclusions
These data demonstrated a stress-induced potentiation of the rewarding effects and self-administration of ethanol mediated by KOR signaling.
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Acknowledgements
We thank Dr. Ute Hochgeschwender for generously providing the prodynorphin gene-disrupted mice. This research is supported by R03 DA16415 from the National Institute on Drug Abuse to JPM and funds from the State of Florida, Executive Office of the Governor's Office of Tourism, Trade, and Economic Development. Mice were housed and cared for in the Northeastern University or TPIMS animal facilities in accordance with the 1996 National Institutes of Health Guide for the Care and Use of Laboratory Animals. All studies were performed after prior approval by the local Institutional Animal Care and Use Committee and are in full compliance with the current laws of the USA.
Conflicts of interest
The authors declare that they have full control of all primary data. Except for income received from our primary employers, no financial support or compensation has been received from any individual or corporate entity over the past 3 years for research or professional services related to this project, and there are no personal financial holdings that could be perceived as constituting a potential conflict of interest.
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Robin E. Sperling and Stacey M. Gomes contributed equally to this project.
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Sperling, R.E., Gomes, S.M., Sypek, E.I. et al. Endogenous kappa-opioid mediation of stress-induced potentiation of ethanol-conditioned place preference and self-administration. Psychopharmacology 210, 199–209 (2010). https://doi.org/10.1007/s00213-010-1844-5
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DOI: https://doi.org/10.1007/s00213-010-1844-5