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Role of test activity in ethanol-induced disruption of place preference expression in mice

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Abstract

Rationale

Reduced expression of a drug-induced conditioned place preference (CPP) may reflect a decrease in the drug’s conditioned rewarding effects. However, CPP is also open to disruption by processes unrelated to the underlying motivation. In unpublished studies, we previously observed that ethanol pretreatment before testing disrupted expression of ethanol-induced CPP in DBA/2J mice. We hypothesized that this interference effect was due to large ethanol-induced increases in activity.

Objective

The present studies were designed to examine the relationship between test activity and expression of ethanol-induced CPP both in the presence and absence of ethanol. To assess the generality of this relationship, we examined these effects both in DBA/2J (which are highly activated by ethanol) and in NZB/B1NJ mice (which show similar CPP, but less ethanol-induced activation).

Materials and methods

In separate experiments, inbred mice from each strain underwent ethanol (2 g/kg) place conditioning. Saline or ethanol was then administered immediately before the test.

Results

Ethanol, given immediately before the test, blocked the expression of ethanol CPP in DBA/2J, but not in NZB/B1NJ mice. Moreover, ethanol significantly increased test activity levels in DBA/2J and to a much lesser degree in NZB/B1NJ mice. Correlation analyses showed an inverse phenotypic relationship between preference and test activity, reflecting stronger preferences in less active mice.

Conclusions

Disruption of ethanol-CPP observed in DBA/2J mice may be a consequence of high ethanol-induced activity levels. More generally, these studies suggest that competing behaviors can affect expression of a drug-induced CPP independent of affecting the conditioned rewarding effects of the drug.

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Acknowledgment

This research was supported by NIH-NIAAA grants AA007468, AA016041 and AA007702. We thank Tamara J. Phillips, Tara L. Fidler, and Laura Summers Bax for comments on earlier drafts of this paper. Experiments within this manuscript comply with the current laws of the United States of America.

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Correspondence to Christina M. Gremel.

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Gremel, C.M., Cunningham, C.L. Role of test activity in ethanol-induced disruption of place preference expression in mice. Psychopharmacology 191, 195–202 (2007). https://doi.org/10.1007/s00213-006-0651-5

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  • DOI: https://doi.org/10.1007/s00213-006-0651-5

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