title: Clock gene dysfunction in patients with obstructive sleep apnoea syndrome.
abstract: Clock genes regulate mammalian circadian rhythms, and dysfunction of clock genes can contribute to various disorders. To investigate whether obstructive sleep apnoea syndrome (OSAS) influences clock gene function, the present authors examined Period1 (Per1) mRNA expression in vitro and in vivo. In eight healthy subjects and eight OSAS patients, plasma noradrenaline, serum interleukin (IL)-6, high-sensitivity C-reactive protein (hsCRP) and Per1 mRNA expression in peripheral whole blood were measured. Expression of Per1 mRNA in cultured cells was examined under IL-6 or noradrenaline stimulation in vitro. After noradrenaline was administered to mice in vivo, Per1 mRNA expression in the brain was examined. The concentrations of serum IL-6, hsCRP and plasma noradrenaline were elevated in OSAS patients, but improved by continuous positive airway pressure (CPAP) therapy. Per1 mRNA expression in the peripheral blood significantly decreased at 02:00 h by CPAP in OSAS patients. Stimulation with IL-6 did not directly induce Per1 mRNA in vitro. Administration of noradrenaline induced Per1 mRNA in the cerebral cortex of mice in vivo. The current study revealed that obstructive sleep apnoea syndrome caused clock gene dysfunction, and continuous positive airway pressure helped to improve it. Sympathetic activation and elevation of the plasma noradrenaline concentration in obstructive sleep apnoea syndrome may be one of the factors involved in disorders of Period1 mRNA expression.
authors.affiliation: Division of Medical Oncology and Molecular Respirology, Faculty of Medicine, Tottori University, 36-1 Nishimachi, Yonago 683-8504, Japan. burioka@grape.med.tottori-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Burioka
authors.forename: S
authors.initials: S
authors.lastname: Koyanagi
authors.forename: M
authors.initials: M
authors.lastname: Endo
authors.forename: M
authors.initials: M
authors.lastname: Takata
authors.forename: Y
authors.initials: Y
authors.lastname: Fukuoka
authors.forename: M
authors.initials: M
authors.lastname: Miyata
authors.forename: K
authors.initials: K
authors.lastname: Takeda
authors.forename: H
authors.initials: H
authors.lastname: Chikumi
authors.forename: S
authors.initials: S
authors.lastname: Ohdo
authors.forename: E
authors.initials: E
authors.lastname: Shimizu
mesh_terms: D000328:Adult; D000818:Animals; D016022:Case-Control Studies; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002478:Cells, Cultured; D021081:Chronobiology Disorders / Q000235:genetics* / Q000628:therapy; D002940:Circadian Rhythm / Q000235:genetics*; D045422:Continuous Positive Airway Pressure; D005260:Female; D005347:Fibroblasts; D006801:Humans; D015850:Interleukin-6 / Q000502:physiology; D007962:Leukocytes; D008297:Male; D051379:Mice; D008875:Middle Aged; D009638:Norepinephrine / Q000502:physiology; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D056950:Period Circadian Proteins; D012333:RNA, Messenger / Q000378:metabolism; D012891:Sleep Apnea Syndromes / Q000150:complications*
chemical_list: D018797:Cell Cycle Proteins; C508600:IL6 protein, human; D015850:Interleukin-6; D009687:Nuclear Proteins; C539022:PER1 protein, human; C539023:Per1 protein, mouse; D056950:Period Circadian Proteins; D012333:RNA, Messenger; D009638:Norepinephrine