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Addict Biol. 2018 Jul 9. doi: 10.1111/adb.12641. [Epub ahead of print]

GAL3 receptor knockout mice exhibit an alcohol-preferring phenotype.

Author information

1
School of Life Sciences, Department of Physiology, Anatomy and Microbiology, La Trobe University, Australia.
2
School of Psychology and Public Health, Department of Psychology, La Trobe University, Australia.
3
Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia.
4
Laura Bassi Centre of Expertise-Therapeutic Application of Neuropeptides (THERAPEP), Research Program for Receptor Biochemistry and Tumour Metabolism, Department of Pediatrics, Paracelsus Medical University, Austria.
5
Department of Pharmacology, University of Melbourne, Australia.
6
The College of Public health, Medical and Veterinary Sciences, James Cook University, Australia.

Abstract

Galanin is a neuropeptide which mediates its effects via three G-protein coupled receptors (GAL1-3 ). Administration of a GAL3 antagonist reduces alcohol self-administration in animal models while allelic variation in the GAL3 gene has been associated with an increased risk of alcohol use disorders in diverse human populations. Based on the association of GAL3 with alcoholism, we sought to characterize drug-seeking behavior in GAL3 -deficient mice for the first time. In the two-bottle free choice paradigm, GAL3 -KO mice consistently showed a significantly increased preference for ethanol over water when compared to wildtype littermates. Furthermore, male GAL3 -KO mice displayed significantly increased responding for ethanol under operant conditions. These differences in alcohol seeking behavior in GAL3 -KO mice did not result from altered ethanol metabolism. In contrast to ethanol, GAL3 -KO mice exhibited similar preference for saccharin and sucrose over water, and a similar preference for a high fat diet over a low fat diet as wildtype littermates. No differences in cognitive and locomotor behaviors were observed in GAL3 -KO mice to account for increased alcohol seeking behavior. Overall, these findings suggest genetic ablation of GAL3 in mice increases alcohol consumption.

KEYWORDS:

addiction; alcohol; galanin; galanin receptor-3

PMID:
29984872
DOI:
10.1111/adb.12641

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