title: Circadian characteristics of mice depleted with GPR7.
abstract: GPR7, now known as a receptor of neuropeptide B and neuropeptide W, is expressed in neurons of the suprachiasmatic nucleus (SCN), the mammalian circadian center. By the quantitative in situ hybridization, we demonstrated that GPR7 mRNA showed a significant circadian rhythm in the SCN showing a peak at early subjective night in both light-dark and constant dark. We characterized the circadian feature of GPR7-knockout mice, but the period length and the phase-dependent phase shift to light exposure were not disordered in GPR7-knockout mice. Moreover, the food-anticipatory behavior in restricted feeding schedule was observed in this gene-deleted mouse similar to wild-type. These results indicate that the role of GPR7 may be subtle or limited in relation to the circadian clock despite its robust expression in the SCN.
authors.affiliation: Department of Systems Biology, Graduate School of Pharmacological Science, Kyoto University, Kyoto, Japan.
authors.forename: Naohiro
authors.initials: N
authors.lastname: Uchio
authors.forename: Masao
authors.initials: M
authors.lastname: Doi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Matsuo
authors.forename: Fumiyoshi
authors.initials: F
authors.lastname: Yamazaki
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Mizoro
authors.forename: Mari
authors.initials: M
authors.lastname: Hondo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sakurai
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Okamura
mesh_terms: D000818:Animals; D001683:Biological Clocks / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology; D005786:Gene Expression Regulation; D008027:Light; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009474:Neurons / Q000378:metabolism; D017440:Photoperiod; D012333:RNA, Messenger / Q000378:metabolism; D043562:Receptors, G-Protein-Coupled / Q000235:genetics / Q000378:metabolism*; D018013:Receptors, Neuropeptide / Q000235:genetics / Q000378:metabolism*; D013493:Suprachiasmatic Nucleus / Q000166:cytology / Q000378:metabolism
chemical_list: C485721:Npbwr1 protein, mouse; D012333:RNA, Messenger; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide