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• W2000555736 abstract "Aging is associated with a progressive decrease in appetite and food intake. Both A and B orexins, expressed in specific neurons of the lateral hypothalamic area, have been implicated in the regulation of sleep and feeding. In this study, the stimulatory effect of intracerebroventricular administration of the orexins on food intake was compared between young (4-mo-old) and old (25- to 27-mo-old) male Wistar rats. A stainless steel cannula was implanted stereotactically into the left lateral ventricle. After a 7-day recovery period, different doses (0-30 nmol) of orexins were injected into the left lateral ventricle without anesthesia. Food and water consumptions were measured at 1, 2, and 4 h after injection. The protein levels of orexin receptors, a specific receptor for orexin-A (OX1R) and a receptor for both orexin-A and -B (OX2R), in the hypothalamus were determined by Western blot analysis and compared between young and old rats. Intracerebroventricular administration of orexin-A stimulated food intake in a dose-dependent manner in young rats. However, no effects were observed at any dose in old rats. The protein level of OX1R in the hypothalamus was significantly lower in old rats than in young rats, although the protein level of OX2R was comparable between groups. Results of the present study indicate that the function of the orexin system is diminished in old rats. The decrease in the OX1R protein level in the hypothalamus could be responsible for orexin-A's lack of stimulation of food intake in old rats." @default.
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• W2000555736 date "2004-12-01" @default.
• W2000555736 modified "2023-10-13" @default.
• W2000555736 title "Orexin-A does not stimulate food intake in old rats" @default.
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• W2000555736 doi "https://doi.org/10.1152/ajpgi.00218.2004" @default.
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