title: Circadian rhythms and the effect of glucocorticoids on expression of the clock gene period1 in canine peripheral blood mononuclear cells.
abstract: Circadian rhythms have a periodicity of approximately 24h and, in mammals, are regulated by clock genes. In this study, expression profiles of clock genes (per1, per2, clock, bmal1 and cry1) were investigated over a single 24h period by real-time PCR in peripheral blood mononuclear cells (PBMCs) of healthy dogs and canine PBMCs treated in vitro and in vivo with glucocorticoids. Only per1 mRNA exhibited daily rhythms in canine PBMCs. Canine PBMCs cultured with dexamethasone in vitro had dose- and time-dependent increases in per1 mRNA expression. Intravenous injection of dexamethasone increased expression of per1 in canine PBMCs in vivo. Rhythmic expression of per1 in PBMCs could be used as a molecular marker for monitoring circadian rhythms and the effects of drugs on clock genes in dogs.
authors.affiliation: Laboratory of Veterinary Molecular Pathology and Therapeutics, Division of Animal Life Science, Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Ohmori
authors.forename: Sho
authors.initials: S
authors.lastname: Nishikawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Oku
authors.forename: Kumiko
authors.initials: K
authors.lastname: Oida
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Amagai
authors.forename: Naoki
authors.initials: N
authors.lastname: Kajiwara
authors.forename: Kyungsook
authors.initials: K
authors.lastname: Jung
authors.forename: Akira
authors.initials: A
authors.lastname: Matsuda
authors.forename: Akane
authors.initials: A
authors.lastname: Tanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Matsuda
mesh_terms: D000818:Animals; D001831:Body Temperature; D002940:Circadian Rhythm; D003907:Dexamethasone / Q000494:pharmacology*; D004285:Dogs / Q000502:physiology*; D005260:Female; D005786:Gene Expression Regulation / Q000502:physiology*; D005938:Glucocorticoids / Q000494:pharmacology; D008297:Male; D056950:Period Circadian Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D005938:Glucocorticoids; D056950:Period Circadian Proteins; D003907:Dexamethasone