Evidence of NPY Y5 receptor involvement in food intake elicited by orexin A in sated rats |
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Authors: | Dube M G Horvath T L Kalra P S Kalra S P |
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Institution: | Department of Physiology, P.O. Box 100274, University of Florida College of Medicine, Gainesville, FL 32610-0274, USA. mdube@ufl.edu |
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Abstract: | Intracerebroventricular (icv) injections of orexin A stimulate feeding in sated rats. Since neuropeptide Y is a potent orexigenic peptide and orexin-containing neurons are morphologically linked with NPY-producing neurons in the hypothalamus, we evaluated the functional relationship between the two orexigenic peptides. The results show that whereas it was ineffective on its own, a selective NPY Y5 receptor antagonist, injected icv 15 min. before orexin A significantly suppressed orexin A-induced feeding. Since previous investigations demonstrated that an NPY Y1 receptor antagonist also inhibits feeding induced by orexin A, the current results further underscore the existence of a functional link between orexin and NPY producing neurons as the orexin network appears to be capable of influencing NPYergic signaling through Y1 and Y5 receptors to stimulate feeding. |
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