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Title: Prolonged consumption of soy or fish-oil-enriched diets differentially affects the pattern of hypothalamic neuronal activation induced by refeeding in rats
Authors: Watanabe, Regina L. H.
Andrade, Iracema S.
Zemdegs, Juliane C. S.
Albuquerque, Kelse T. [UNIFESP]
Nascimento, Claudia M. O.
Oyama, Lila M. [UNIFESP]
Carmo, Maria G. T.
Nogueira, Maria I.
Ribeiro, Eliane B. [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Universidade Federal do Rio de Janeiro (UFRJ)
Universidade de São Paulo (USP)
Keywords: appetite regulation
c-Fos immunoreactivity
hyperlipidic diet
soy oil
fish oil
Issue Date: 1-Dec-2009
Publisher: Maney Publishing
Citation: Nutritional Neuroscience. Leeds: Maney Publishing, v. 12, n. 6, p. 242-248, 2009.
Abstract: We used c-Fos immunoreactivity to estimate neuronal activation in hypothalamic feeding-regulatory areas of 3-month-old rats fed control or oil-enriched diets (soy or fish) since weaning. While no diet effect was observed in c-Fos immunoreactivity of 24-h fasted animals, the acute response to refeeding was modified by both hyperlipidic diets but with different patterns. Upon refeeding, control-diet rats had significantly increased c-Fos immunoreactivity only in the paraventricular hypothalamic nucleus (PVH, 142%). in soy-diet rats, refeeding with the soy diet increased c-Fos immunoreactivity in dorsomedial hypothalamic nucleus (DMH, 271%) and lateral hypothalamic area (LH, 303%). Refeeding fish-diet rats with the fish diet increased c-Fos immunoreactivity in PVH (161%), DMH (177%), VMH (81%), and ARC (127%). Compared to the fish-diet, c-Fos immunoreactivity was increased in LH by the soy-diet while it was decreased in ventromedial hypothalamic nucleus (VMH) and arcuate hypothalamic nucleus (ARC). Based on the known roles of the activated nuclei, it is suggested that, unlike the fish-diet, the soy-diet induced a potentially obesogenic profile, with high LH and low VMH/PVH activation after refeeding.
ISSN: 1028-415X
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