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- W2250163054 abstract "Prolactin-releasing peptide (PrRP) is an endogenous hypothalamic neuropeptide that when exogenously injected increases food intake in chickens, but decreases it in rodents and goldfish. We designed three sets of experiments to elucidate the mechanisms of PrRP’s orexigenic effect in chicks. In experiment one, food and water intake were evaluated in chicks after receiving intracerebroventricular (ICV) injection of the vehicle, 0.75, 3, 12, 47 or 188 pmol PrRP. The administration of 12 and 47 pmol PrRP increased food intake for up to 120 min after injection, and 188 pmol increased it for up to 180 min. The lowest effective dose was 3 pmol, which increased food intake for up to 60 min after injection. Water intake was not affected. To investigate the molecular mechanisms, c-Fos immunohistochemistry was performed and mRNA expression of some appetiteassociated neurotransmitters was measured in chicks that received either vehicle or 188 pmol of PrRP. The rostral paraventricular nucleus (PVN) was activated which coincided with increased neuropeptide Y (NPY) mRNA expression in the whole hypothalamus. In experiment two, food and water intake were evaluated in chicks fed a high carbohydrate (HC), high fat (HF) or high protein (HP) diet after ICV injection of vehicle, 3 or 188 pmol PrRP. Chicks fed the HP diet increased food intake at a lower dose than chicks fed HF and HP diets after ICV PrRP injection. In addition, ICV injection of vehicle, 3 and 188 pmol PrRP were performed in chicks fed all three diets, and ICV PrRP injection" @default.
- W2250163054 created "2016-06-24" @default.
- W2250163054 creator A5011057377 @default.
- W2250163054 date "2015-06-29" @default.
- W2250163054 modified "2023-09-23" @default.
- W2250163054 title "Central mechanisms of prolactin-releasing peptides orexigenic effect in chickens" @default.
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