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Ghrelin is an orexigenic peptide secreted from the stomach and also made in the brain. Ghrelin receptors are expressed on hypothalamic cells important in appetite and energy balance. We determined that intra-3rd-ventricular (i3vt) ghrelin dose-dependently increases acute (1 and 2h) food intake in lean and fatty Zucker rats (0, 0.01, 0.1 and 1.0nmol ghrelin). The percentage increase of food intake...
Since the discovery that central melanocortin peptides play an important role in the control of body weight, an impressive amount of research has focused on understanding this complex neuroendocrine system. However, this research has also uncovered new complexities. One of these complexities is the recently discovered putative melanocortin “co-receptor,” syndecan-3. In this review, we present an overview...
The ingestion of foods is comprised of two distinct phases of behavior: appetitive and consummatory. While most food intake paradigms include both phases, the intraoral intake test emphasizes the stereotyped consummatory-phase by infusing a liquid food directly into the oral cavity. Several hypothalamic peptides have been shown to increase intake of chow in standard food intake paradigms and the current...
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