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Title: Chronobiology of micturition: putative role of the circadian clock.
Authors: Negoro, Hiromitsu  kyouindb  KAKEN_id
Kanematsu, Akihiro
Yoshimura, Koji
Ogawa, Osamu  kyouindb  KAKEN_id
Author's alias: 根来, 宏光
小川, 修
Keywords: urinary bladder
chronobiology phenomena
circadian clocks
Issue Date: Sep-2013
Publisher: Elsevier Inc.
Journal title: The Journal of urology
Volume: 190
Issue: 3
Start page: 843
End page: 849
Abstract: [Purpose]Mammals urinate less frequently during the sleep period than the awake period. This is modulated by a triad of factors, including decreased arousal in the brain, a decreased urine production rate in the kidneys and increased functional bladder capacity during sleep. The circadian clock is genetic transcription-translation feedback machinery. It exists in most organs and cells, termed the peripheral clock, which is orchestrated by the central clock in the suprachiasmatic nucleus of the brain. We discuss the linkage between the day and night change in micturition frequency and the genetic rhythm maintained by the circadian clock system, focusing on the brain, kidney and bladder. [Material and Methods]We performed an inclusive review of the literature on the diurnal change in micturition frequency, urine volume, functional bladder capacity and urodynamics in humans and rodents, relating this to recent basic biological findings about the circadian clock. [Results]In humans various behavioral studies demonstrated a diurnal functional change in the kidney and bladder. Conversely, patients with nocturnal enuresis and nocturia showed impairment in this triad of factors. Rats and mice, which are nocturnal animals, also have a micturition frequency rhythm that is decreased during the day, which is the sleep phase for them. Mice with a genetically defective circadian clock system show impaired physiological rhythms in the triad of factors. The existence of the circadian clock has been proven in the brain, kidney and bladder, in which thousands of circadian oscillating genes exist. In the kidney they include genes involved in the regulation of water and major electrolytes. In the bladder they include connexin 43, a gene associated with the regulation of bladder capacity. [Conclusions]Recent progress in molecular biology about the circadian clock provides an opportunity to investigate the genetic basis of the micturition rhythm or impairment of the rhythm in nocturnal enuresis and nocturia. If this approach is to be translated clinically, a strategy is to analyze and treat the triad of micturition factors as separate parts of 1 problem. The other way could be to cope with this triad of problems simultaneously, if possible, by treating the circadian physiological rhythm itself. The discoveries reviewed point toward further investigation of the micturition rhythm by basic and translational chronobiology.
Rights: © 2013 American Urological Association Education and Research, Inc. Published by Elsevier Inc.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.juro.2013.02.024
PubMed ID: 23429068
Appears in Collections:Journal Articles

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