Abstract
Novel neuropeptides acting as G-protein-coupled receptor (GPCR) ligands are known to be localized in the brain and play a range of physiologic functions, one of which is feeding regulation. We describe the distribution and localization of these recently identified GPCR ligands and review their involvement in neuronal networks, particularly in feeding regulation. This review addresses aspects of some novel GPCR ligands, including feeding-regulating neuropeptides such as orexin, ghrelin, and galanin-like peptide and other known neuropeptides such as neuropeptide Y and pro-opiomelanocortin. These neuropeptides have been studied by our research group and others, particularly with regard to interactions in the hypothalamus of neurons containing these neuropeptides. In the hypothalamus, cross-talk among such neurons plays a key role in determining feeding states and feeding behavior. We describe some structural and functional characteristics of these neuropeptides and summarize the known interactions between the different kinds of feeding-regulating neurons and leptin-targeting neurons in the hypothalamus. Moreover, we present a new strategy for analyzing neural circuits involving these feeding-regulating GPCR ligands in the brain, w...Continue Reading
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