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• W2014694578 abstract "Neuropeptide Y strongly stimulates food intake when it is injected in the hypothalamic paraventricular (PVN) and ventromedian (VMN) nuclei. In Sprague-Dawley (SD) rats, NPY synthesis in the arcuate nucleus (ARC) is increased by food deprivation and is normalized by refeeding. We have previously shown that the obese hyperphagic Zucker rat is characterized by higher NPY concentrations in this nucleus. NPY might therefore play an important role in the development of hyperphagia. The aim of the present study was to determine if the regulation by the feeding state works in the obese Zucker rat. For this purpose, 10 weeks-old male lean (n=30) and obese (n=30) Zucker rats were either fed ad libitum, either food-deprived (FD) for 48 hours or food-deprived for 48 h and refed (RF) for 6 hours. NPY was measured in several microdissected brain areas involved in the regulation of feeding behavior. NPY concentrations in the ARC was about 50 % greater in obese rats than in lean rats (p < 0.02) whatever feeding state. In the VMN, NPY concentrations were higher in the lean FD rats than in the obese FD rat (p < 0.001). Food deprivation or refeeding did not modify NPY in the ARC, in the VMN or in the dorsomedian nucleus whatever the genotype considered. On the other hand, food deprivation induced a significant decrease in NPY concentrations in the PVN of lean rats. This decrease was localized in the parvocellular part of this nucleus (43.0 ±1.9(FD) vs 54.2 ± 2.1 (Ad lig) ng/mg protein ; p < 0.005). Ad lib levels were restored by 6 hours of refeeding. These variations were not observed in the obese rat. The regulation of NPY by the feeding state in the Zucker rat was therefore very different from that described in the SD rats. Strain or age of the animals used might explain these differences. High NPY levels and absence of regulation in obese Zucker rats could contribute to the abnormal feeding behavior of these rats." @default.
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• W2014694578 title "Unexpected regulation of hypothalamic neuropeptide Y by food deprovation and refeeding in the Zucker rat." @default.
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• W2014694578 doi "https://doi.org/10.1016/0024-3205(92)90169-p" @default.
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