期刊
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR
卷 101, 期 1, 页码 132-137出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pbb.2011.12.013
关键词
Anhedonia; Anxiety; Environmental habituation; Ethanol; Novelty seeking; Withdrawal
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundo de Apoio ao Docente e Aluno (FADA)
- Associacao Fundo de Pesquisa em Psicobiologia (AFIP)
Ethanol withdrawal syndrome is characterized by somatic and behavioral symptoms, including increased anxiety and anhedonia. In animal models, however, there are many studies on the anxiogenic effects occurring during the first 24 h after ethanol withdrawal, while anhedonia has been overlooked. Recently, we have found that amphetamine withdrawal reduced novelty seeking and enhanced environmental habituation in mice, two motivation-related behaviors. We now investigate the effects of withdrawal from ethanol, a drug of abuse with a different pharmacological profile, on these two motivation-related behaviors. Swiss male mice (3 months old) were treated with 1.8 g/kg ethanol for 21 consecutive days in their home cages. Seven days after ethanol withdrawal, mice were tested in a free-choice novelty apparatus containing one familiar and one novel compartment. Novelty-seeking behavior was assessed by comparing time spent in the novel compartment versus the familiar compartment, whereas environmental habituation was concomitantly evaluated by the time-response curve of total locomotion (novel + familiar). Novelty seeking was decreased and environmental habituation was enhanced during ethanol withdrawal. These anhedonic responses were not associated with concurrent changes in the anxiety-like behavior of mice (as confirmed in the elevated plus-maze test). We propose that the concomitant evaluation of novelty-seeking behavior and environmental habituation can be useful to study the behavioral consequences not only of amphetamine withdrawal but also of ethanol withdrawal. Furthermore, the present data support recent clinical findings that suggest the occurrence of protracted anhedonia well beyond the limited period immediately following the abrupt cessation of ethanol intake. (C) 2012 Elsevier Inc. All rights reserved.
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