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Differential role of the accumbens Shell and Core subterritories in food-entrained rhythms of rats
- Source :
-
Behavioural Brain Research . Mar2005, Vol. 158 Issue 1, p133-142. 10p. - Publication Year :
- 2005
-
Abstract
- Abstract: Restricted feeding schedules (RFS) entrain behavioral and physiological rhythms even in suprachiasmatic nucleus ablated animals, suggesting the existence of a food-entrained oscillator. The nucleus accumbens is an important structure for the expression of motivational behaviors and because its anatomical subterritories, Shell (Acc-Sh) and Core (Acc-Co) establish connections with different functional systems, they may participate in a differential way in food-entrainment. A first experiment, explored the role of Acc-Sh and Acc-Co in food-entrainment using the immunohistochemical detection of the protein c-Fos as a transcriptional activation marker. Experiment 2 tested the differential effect of Acc-Sh and Acc-Co, NMDA excitotoxic lesions. Lesioned rats were entrained to RFS and locomotor activity and free fatty acids (FFA) concentrations were evaluated. Results data show that in the Acc-Sh there is an increase of c-Fos immunoreactivity in food-entrained rats principally during feeding, whereas c-Fos expression in the Acc-Co region was increased during feeding and also anticipating mealtime. FFA were entrained in both lesioned groups, but the basal level was lower in Core-lesion rats. All rats exhibited food anticipatory activity (FAA). However, FAA was increased in Shell-lesioned animals and was almost abolished in the Core-lesion rats. These data indicate that the accumbens nucleus is involved with behavioral and metabolic food-entrainment, and that there is a differential role between both subregions. [Copyright &y& Elsevier]
- Subjects :
- *MURIDAE
*FATTY acids
*AIR travel
*SUPRACHIASMATIC nucleus
Subjects
Details
- Language :
- English
- ISSN :
- 01664328
- Volume :
- 158
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Behavioural Brain Research
- Publication Type :
- Academic Journal
- Accession number :
- 17328884
- Full Text :
- https://doi.org/10.1016/j.bbr.2004.08.016