Abstract
Nesfatin-1 is a recently discovered neuropeptide that has been shown to decrease food intake after lateral, third, or fourth brain ventricle, cisterna magna administration, or PVN injection in ad libitum fed rats. With regards to the understanding of nesfatin-1 brain sites of action, additional microinjection studies will be necessary to define specific nuclei, in addition to the PVN, responsive to nesfatin-1 to get insight into the differential effects on food intake. In the present study, we evaluated nesfatin-1 action to modulate food intake response upon injection into the specific hypothalamic nuclei (PVN, LHA and VMN) in freely fed rats during the dark phase. We extend previous observations by showing that the nesfatin-1 (50 pmol) injected before the onset of the dark period significantly reduced the 1 to 5 h cumulative food intake in rats cannulated into the PVN, LHA, but not in rats cannulated into the VMN. Glucosensing neurons located in the hypothalamus are involved in glucoprivic feeding and homeostatic control of blood glucose. In order to shed light on the mechanisms by which nesfatin-1 exerts its satiety-promoting actions, we examined the effect of nesfatin-1 on the excitability of hypothalamic glucosensing neuron...Continue Reading
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