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• W2013376110 abstract "The adaptation of the physiology of an animal to changing conditions of light and food availability is evident at the behavioral and hormonal levels. Melatonin, leptin, ghrelin, and orexin, which exhibit rhythmic secretion profiles under ad libitum feeding conditions, are sensitive to changes in daylength, forming a tight web of interrelationships in the regulation of energy balance. The aim of this study was to determine the effects of central injections of leptin, ghrelin, and orexin on the reciprocal interactions among these hormones and the influence of photoperiod on these responses. Twenty-four ovariectomized and estradiol-implanted ewes were used in a replicated switchback design. The ewes were assigned randomly to 1 of 6 treatment groups, and the treatments were infused into their third ventricles 3 times at 0, 1, and 2 h, with 0 h being at dusk. The treatments were as follows: 1) control, Ringer-Locke buffer; 2) leptin, 0.5 μg/kg BW; 3) ghrelin, 2.5 μg/kg BW; 4) orexin B, 0.3 μg/kg BW; 5) leptin antagonist, 50 μg/kg BW, then ghrelin, 2.5 μg/kg BW; and 6) leptin antagonist, 50 μg/kg BW, then orexin B, 0.3 μg/kg BW. Blood samples (5 mL) were collected at 15-min intervals for 6 h. The administration of leptin increased (P < 0.05) plasma concentrations of melatonin during short-day (ShD) photoperiods and decreased (P < 0.05) them during long-day (LD) photoperiods, whereas ghrelin decreased (P < 0.05) melatonin concentrations during ShD photoperiod, and orexin had no effect (P > 0.1). Leptin attenuated (P < 0.05) ghrelin concentrations relative to the concentration in controls during ShD. The plasma concentrations of orexin were reduced (P < 0.05) after leptin infusions during LD and ShD photoperiods; however, ghrelin had the opposite effect (P < 0.05) on orexin concentration. Orexin increased (P < 0.05) ghrelin concentrations during LD. Ghrelin and orexin concentrations were increased (P < 0.05) after leptin antagonist infusions. Our data provide evidence that the secretion of leptin, ghrelin, and orexin are seasonally dependent, with relationships that are subject to photoperiodic regulation, and that leptin is an important factor that regulates ghrelin and orexin releases in sheep." @default.
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• W2013376110 date "2012-08-01" @default.
• W2013376110 modified "2023-10-14" @default.
• W2013376110 title "Seasonal changes in the interactions among leptin, ghrelin, and orexin in sheep1" @default.
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• W2013376110 doi "https://doi.org/10.2527/jas.2011-4463" @default.
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