Abstract
The neuropeptide Y system consists of three peptide precursor genes encoding neuropeptide Y (NPY), peptide YY (PYY) and pancreatic polypeptide (PP) and at least five receptor genes encoding the Y1, Y2, Y4, Y5 and y6 receptor making it complex to work with. In the past, delineating the function of the NPY system relied mainly on pharmacological approaches using modified peptide ligands and a few synthetic molecules. However, interpretation of the results was difficult due to the poor knowledge of the in vivo selectivity and the distinct metabolic or pharmacokinetic properties of the compounds used. One can never be sure that ligands which are highly selective in in vitro systems, demonstrated by their binding properties on brain tissue or recombinant receptor preparations, do not crossreact with other known or yet unidentified receptors in vivo. Furthermore, their action can vary strongly depending on the dose, the site and the mode (acute versus chronic) of administration of the compound. This leaves unanswered many questions regarding the functional contributions of the different Y receptors to a variety of important physiological processes. Modern molecular biology technologies such as the generation of transgenic or gene-targeted rodent models offer valid alternatives to these pharmacological approaches. Over recent years studies describing the overexpression of NPY in transgenic mice and rat models as well as the inactivation of the NPY, Y1, Y2, Y4 and Y5 gene by homologous recombination have been published. The analysis of the phenotypes of all these animal models has revealed significant and distinct roles of each gene in modulating feeding behavior, fertility, seizure susceptibility, pain perception, cardiovascular function and emotional behaviors.
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Herzog, H. (2004). Transgenic and Knockout Models in NPY Research. In: Michel, M.C. (eds) Neuropeptide Y and Related Peptides. Handbook of Experimental Pharmacology, vol 162. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18764-3_15
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