title: Nocturnal catecholamines and immune function in insomniacs, depressed patients, and control subjects.
abstract: Insomnia predicts cardiovascular and non-cardiovascular disease mortality. This study evaluated EEG sleep, nocturnal sympathetic activity, and daytime measures of immune function in subjects with primary insomnia (n = 17) and patients with current major depression (n = 14) as compared to controls (n = 31). Insomniacs showed disordered sleep continuity along with nocturnal increases of average levels of circulating norepinephrine and decreases of natural killer cell responses, whereas depressed patients showed declines of natural killer cell activity, but no differences of EEG sleep or nocturnal catecholamines as compared to controls. Impairments of sleep efficiency correlated with nocturnal elevations of norepinephrine in the insomniacs but not in the depressives or controls. These data indicate that insomnia is associated with nocturnal sympathetic arousal and declines of natural immunity, and further support the role of sleep in the regulation of sympathetic nervous and immune system functioning.
authors.affiliation: Cousins Center for Psychoneuroimmunonology, UCLA Neuropsychiatric Institute, University of California, Los Angeles, CA 90095-7057, USA. mirwin@ucla.edu
authors.forename: Michael
authors.initials: M
authors.lastname: Irwin
authors.forename: Camellia
authors.initials: C
authors.lastname: Clark
authors.forename: Brian
authors.initials: B
authors.lastname: Kennedy
authors.forename: J
authors.initials: J
authors.lastname: Christian Gillin
authors.forename: Michael
authors.initials: M
authors.lastname: Ziegler
mesh_terms: D000704:Analysis of Variance; D016022:Case-Control Studies; D002940:Circadian Rhythm / Q000276:immunology*; D003865:Major Depressive Disorder / Q000097:blood / Q000276:immunology*; D004569:Electroencephalography; D004837:Epinephrine / Q000097:blood; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D009638:Norepinephrine / Q000097:blood*; D017286:Polysomnography; D012016:Reference Values; D012890:Sleep / Q000502:physiology; D007319:Sleep Initiation and Maintenance Disorders / Q000097:blood / Q000175:diagnosis / Q000276:immunology*; D013564:Sympathetic Nervous System / Q000503:physiopathology
chemical_list: D007376:Interleukin-2; D009638:Norepinephrine; D004837:Epinephrine