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New operant model of reinstatement of food-seeking behavior in mice.
MedLine Citation:
PMID:  21161187     Owner:  NLM     Status:  Publisher    
RATIONALE: A major problem in treating obesity is the high rate of relapse to abnormal food-taking behavior when maintaining diet. OBJECTIVES: The present study evaluates the reinstatement of extinguished palatable food-seeking behavior induced by cues previously associated with the palatable food, re-exposure to this food, or stress. The participation of the opioid and dopamine mechanisms in the acquisition, extinction, and cue-induced reinstatement was also investigated. MATERIALS AND METHODS: C57BL/6 mice were first trained on a fixed-ratio-1 schedule of reinforcement to obtain chocolate-flavored pellets during 20 days, which was associated to a stimulus light. Operant behavior was then extinguished during 20 daily sessions. mRNA levels of opioid peptide precursors and dopamine receptors were evaluated in the brain by in situ hybridization and RT-PCR techniques. RESULTS: A reinstatement of food-seeking behavior was only obtained after exposure to the food-associated cue. A down-regulation of prodynorphin mRNA was found in the dorsal striatum and nucleus accumbens after the acquisition, extinction, and reinstatement of the operant behavior. Extinction and reinstatement of this operant response enhanced proenkephalin mRNA in the dorsal striatum and/or the nucleus accumbens core. Down-regulation of D2 receptor expression was observed in the dorsal striatum and nucleus accumbens after reinstatement. An up-regulation of PDYN mRNA expression was found in the hypothalamus after extinction and reinstatement. CONCLUSIONS: This study provides a new operant model in mice for the evaluation of food-taking behavior and reveals specific changes in the dopamine and opioid system associated to the behavioral responses directed to obtain a natural reward.
Elena Martín-García; Aurelijus Burokas; Elzbieta Kostrzewa; Agnieszka Gieryk; Michal Korostynski; Barbara Ziolkowska; Barbara Przewlocka; Ryszard Przewlocki; Rafael Maldonado
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-14
Journal Detail:
Title:  Psychopharmacology     Volume:  -     ISSN:  1432-2072     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7608025     Medline TA:  Psychopharmacology (Berl)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Departament de Ciencies Experimentals i de la Salut, Universitat Pompeu Fabra, PRBB, C/Dr. Aiguader 88, 08003, Barcelona, Spain.
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