Involvement of urinary bladder Connexin43 and the circadian clock in coordination of diurnal micturition rhythm

Hiromitsu Negoro, Akihiro Kanematsu, Masao Doi, Sylvia O. Suadicani, Masahiro Matsuo, Masaaki Imamura, Takeshi Okinami, Nobuyuki Nishikawa, Tomonori Oura, Shigeyuki Matsui, Kazuyuki Seo, Motomi Tainaka, Shoichi Urabe, Emi Kiyokage, Takeshi Todo, Hitoshi Okamura (), Yasuhiko Tabata and Osamu Ogawa ()
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Hiromitsu Negoro: Graduate School of Medicine, Kyoto University
Akihiro Kanematsu: Graduate School of Medicine, Kyoto University
Masao Doi: Graduate School of Pharmaceutical Sciences, Kyoto University
Sylvia O. Suadicani: Albert Einstein College of Medicine
Masahiro Matsuo: Graduate School of Pharmaceutical Sciences, Kyoto University
Masaaki Imamura: Graduate School of Medicine, Kyoto University
Takeshi Okinami: Graduate School of Medicine, Kyoto University
Nobuyuki Nishikawa: Graduate School of Medicine, Kyoto University
Tomonori Oura: Kyoto University School of Public Health
Shigeyuki Matsui: The Institute of Statistical Mathematics
Kazuyuki Seo: Graduate School of Pharmaceutical Sciences, Kyoto University
Motomi Tainaka: Graduate School of Pharmaceutical Sciences, Kyoto University
Shoichi Urabe: Graduate School of Pharmaceutical Sciences, Kyoto University
Emi Kiyokage: Kawasaki Medical School
Takeshi Todo: Graduate School of Medicine, Osaka University
Hitoshi Okamura: Graduate School of Pharmaceutical Sciences, Kyoto University
Yasuhiko Tabata: Institute for Frontier Medical Sciences, Kyoto University, Sakyo
Osamu Ogawa: Graduate School of Medicine, Kyoto University

Nature Communications, 2012, vol. 3, issue 1, 1-10

Abstract: Abstract Nocturnal enuresis in children and nocturia in the elderly are two highly prevalent clinical conditions characterized by a mismatch between urine production rate in the kidneys and storage in the urinary bladder during the sleep phase. Here we demonstrate, using a novel method for automated recording of mouse micturition, that connexin43, a bladder gap junction protein, is a negative regulator of functional bladder capacity. Bladder connexin43 levels and functional capacity show circadian oscillations in wild-type mice, but such rhythms are completely lost in Cry-null mice having a dysfunctional biological clock. Bladder muscle cells have an internal clock, and show oscillations of connexin43 and gap junction function. A clock regulator, Rev-erbα, upregulates connexin43 transcription as a cofactor of Sp1, using Sp1 cis-elements of the promoter. Therefore, circadian oscillation of connexin43 is associated with the biological clock and contributes to diurnal changes in bladder capacity, which avoids disturbance of sleep by micturition.

Date: 2012
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DOI: 10.1038/ncomms1812

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