title: Neuropeptide Y Y1 receptor mRNA in rodent brain: distribution and colocalization with melanocortin-4 receptor.
abstract: The central neuropeptide Y (NPY) Y1 receptor (Y1-R) system has been implicated in feeding, endocrine, and autonomic regulation. In the present study, we systematically examined the brain distribution of Y1-R mRNA in rodents by using radioisotopic in situ hybridization histochemistry (ISHH) with a novel sensitive cRNA probe. Within the rat hypothalamus, Y1-R-specific hybridization was observed in the anteroventral periventricular, ventromedial preoptic, suprachiasmatic, paraventricular (PVH), dorsomedial, ventromedial, arcuate, and mamillary nuclei. In the rat, Y1-R mRNA expression was also seen in the subfornical organ, anterior hypothalamic area, dorsal hypothalamic area, and in the lateral hypothalamic area. In addition, Y1-R hybridization was evident in several extrahypothalamic forebrain and hindbrain sites involved in feeding and/or autonomic regulation in the rat. A similar distribution pattern of Y1-R mRNA was observed in the mouse brain. Moreover, by using a transgenic mouse line expressing green fluorescent protein under the control of the melanocortin-4 receptor (MC4-R) promoter, we observed Y1-R mRNA expression in MC4-R-positive cells in several brain sites such as the PVH and central nucleus of the amygdala. Additionally, dual-label ISHH demonstrated that hypophysiotropic PVH cells coexpress Y1-R and pro-thyrotropin-releasing hormone mRNAs in the rat. These observations are consistent with the proposed roles of the central NPY/Y1-R system in energy homeostasis.
authors.affiliation: Department of Neurology, Beth Israel Deaconess Medical Center, and Program in Neuroscience, Harvard Medical School, Boston, Massachusetts 02215, USA.
authors.forename: Toshiro
authors.initials: T
authors.lastname: Kishi
authors.forename: Carl J
authors.initials: CJ
authors.lastname: Aschkenasi
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Choi
authors.forename: Marisol E
authors.initials: ME
authors.lastname: Lopez
authors.forename: Charlotte E
authors.initials: CE
authors.lastname: Lee
authors.forename: Hongyan
authors.initials: H
authors.lastname: Liu
authors.forename: Anthony N
authors.initials: AN
authors.lastname: Hollenberg
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Friedman
authors.forename: Joel K
authors.initials: JK
authors.lastname: Elmquist
mesh_terms: D000818:Animals; D001069:Appetite Regulation / Q000502:physiology; D001931:Brain Mapping; D005247:Feeding Behavior / Q000502:physiology; D007031:Hypothalamus / Q000378:metabolism*; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D016548:Prosencephalon / Q000378:metabolism; D018075:RNA, Complementary / Q000032:analysis; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D044105:Receptor, Melanocortin, Type 4 / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled / Q000235:genetics / Q000378:metabolism*; D018013:Receptors, Neuropeptide / Q000235:genetics / Q000378:metabolism*; D012249:Rhombencephalon; D014018:Tissue Distribution
chemical_list: C066211:Npy1r protein, rat; D018075:RNA, Complementary; D012333:RNA, Messenger; D044105:Receptor, Melanocortin, Type 4; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide