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Handling method alters the hedonic value of reward in laboratory mice

Clarkson, Jasmine M., Dwyer, Dominic M. ORCID:, Flecknell, Paul A., Leach, Matthew C. and Rowe, Candy 2018. Handling method alters the hedonic value of reward in laboratory mice. Scientific Reports 8 , 2448. 10.1038/s41598-018-20716-3

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Mice are the most widely used model species for drug discovery and scientific research. Consequently, it is important to refine laboratory procedures and practices to ensure high standards of welfare and scientific data quality. Recent studies have identified that the standard practice of handling laboratory mice by their tails increases behaviours indicative of anxiety, which can be overcome by handling mice using a tunnel. However, despite clear negative effects on mice’s behaviour, tunnel handling has yet to be widely implemented. In this study, we provide the first evidence that tail handling also reduces mice’s responses to reward. Anhedonia is a core symptom of clinical depression, and is measured in rodents by assessing how they consume a sucrose solution: depressed mice consume less sucrose and the size of their licking bouts when drinking (their ‘lick cluster sizes’) also tend to be smaller. We found that tail handled mice showed more anhedonic responses in both measures compared to tunnel handled mice, indicative of a decreased responsiveness to reward and potentially a more depressive-like state. Our findings have significant implications for the welfare of laboratory mice as well as the design and interpretation of scientific studies, particularly those investigating or involving reward.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License.
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 29 January 2018
Date of Acceptance: 23 January 2018
Last Modified: 07 May 2023 06:52

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