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Several behavioral traits relevant for alcoholism are controlled by gamma 2 subunit containing GABA(A) receptors on dopamine neurons in mice
Linköping University, Department of Clinical and Experimental Medicine, Division of Cell Biology. Linköping University, Faculty of Medicine and Health Sciences.
Jagiellonian Univ, Poland.
Polish Acad Sci, Poland.
Jagiellonian Univ, Poland.
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2018 (English)In: Neuropsychopharmacology, ISSN 0893-133X, E-ISSN 1740-634X, Vol. 43, no 7, p. 1548-1556Article in journal (Refereed) Published
Abstract [en]

The risk factors for developing alcohol addiction include impulsivity, high sensitivity to the rewarding action of ethanol, and low sensitivity to its sedative and intoxicating effects. Genetic variation in GABA(A) receptor subunits, including the gamma 2 subunit (Gabrg2), affects the risk for developing alcoholism. Alcohol directly potentiates GABA(A) receptors and activates the mesolimbic dopamine system. Here, we deleted Gabrg2 selectively in dopamine cells of adult mice. The deletion resulted in elevated firing of dopamine neurons and made them less sensitive to drugs acting at GABA(A) receptors. At the behavioral level, the deletion increased exploratory behavior and augmented both correct and incorrect responding in the go/no-go task, a test often used to assay the response inhibition component of impulsivity. In addition, conditioned place preference to alcohol, but not to cocaine or morphine, was increased. Ethanol-induced locomotor activation was enhanced in the mice lacking Gabrg2 on dopaminergic cells, whereas the sedative effect of alcohol was reduced. Finally, the alcohol drinking, but not the alcohol preference, at a high concentration was increased in the mutant mice. In summary, deletion of Gabrg2 on dopamine cells induced several behavioral traits associated with high risk of developing alcoholism. The findings suggest that mice lacking Gabrg2 on dopaminergic cells could be used as models for individuals at high risk for developing alcoholism and that GABA(A) receptors on dopamine cells are protective against the development of excessive alcohol drinking.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 43, no 7, p. 1548-1556
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Neurosciences
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URN: urn:nbn:se:liu:diva-148085DOI: 10.1038/s41386-018-0022-zISI: 000432114600010PubMedID: 29463910OAI: oai:DiVA.org:liu-148085DiVA, id: diva2:1211363
Note

Funding Agencies|European Research Council; Swedish Medical Research Council; Knut and Alice Wallenberg foundation; Swedish Brain foundation; Parkinsonstiftelsen; Region Ostergotland; Polish National Science Centre [HARMONIA 2012/06/M/NZ4/00143, PRELUDIUM 2015/19/N/NZ4/00960]

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-30

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Stojakovic, AndreaSköld, JohanZajdel, JoannaMirrasekhian, ElaheKarlsson, CamillaThorsell, AnnikaHeilig, MarkusEngblom, David
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Division of Cell BiologyFaculty of Medicine and Health SciencesCenter for Social and Affective NeuroscienceDepartment of Psychiatry
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