Clock Genes Regulate the Circadian Expression of Piezo1, TRPV4, Connexin26, and VNUT in an Ex Vivo Mouse Bladder Mucosa

• Published in: PloS one 2017-01, Vol.12 (1), p.e0168234-e0168234
• Main Authors: Ihara, Tatsuya, Mitsui, Takahiko, Nakamura, Yuki, Kira, Satoru, Nakagomi, Hiroshi, Sawada, Norifumi, Hirayama, Yuri, Shibata, Keisuke, Shigetomi, Eiji, Shinozaki, Yoichi, Yoshiyama, Mitsuharu, Andersson, Karl-Erik, Nakao, Atsuhito, Takeda, Masayuki, Koizumi, Schuichi
• Format: Article
• Language: English
• Subjects: Abnormalities; Adenosine triphosphate; Analysis; Animals; Biological clocks; Biology and Life Sciences; Bladder; Cations; Circadian Rhythm; Circadian rhythms; Clock gene; Connexins - genetics; Disease Models, Animal; Gene expression; Gene Expression Regulation; Gene regulation; Genes; Genetic aspects; House mouse; Hypersensitivity; Immunology; Interdisciplinary aspects; Ion Channels - genetics; Male; Medicine; Medicine and Health Sciences; Mice; Mice, Inbred BALB C; Mucosa; Nocturia - genetics; Nocturia - metabolism; Nucleotide Transport Proteins - genetics; Physiological aspects; Polymerase chain reaction; Proteins; Research and Analysis Methods; Sleep; Transcription; Transcription (Genetics); Transient receptor potential proteins; TRPV Cation Channels - genetics; Urinary bladder; Urinary Bladder - metabolism; Urogenital system; Urology
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0168234

ClockΔ19/Δ19 mice is an experimental model mouse for nocturia (NOC). Using the bladder mucosa obtained from ClockΔ19/Δ19 mice, we investigated the gene expression rhythms of mechanosensory cation channels such as transient receptor potential cation channel subfamily V member 4 (TRPV4) and Piezo1, and main ATP release pathways including vesicular nucleotide transporter (VNUT) and Connexin26(Cx26), in addition to clock genes. Eight- to twelve-week-old male C57BL/6 mice (WT) and age- and sex-matched C57BL/6 ClockΔ19/Δ19 mice, which were bred under 12-h light/dark conditions for 2 weeks, were used. Gene expression rhythms and transcriptional regulation mechanisms in clock genes, mechanosensor, Cx26 and VNUT were measured in the mouse bladder mucosa, collected every 4 hours from WT and ClockΔ19/Δ19 mice using quantitative RT-PCR, a Western blot analysis, and ChIP assays. WT mice showed circadian rhythms in clock genes as well as mechanosensor, Cx26 and VNUT. Their expression was low during the sleep phase. The results of ChIP assays showed Clock protein binding to the promotor regions and the transcriptional regulation of mechanosensor, Cx26 and VNUT. In contrast, all of these circadian expressions were disrupted in ClockΔ19/Δ19 mice. The gene expression of mechanosensor, Cx26 and VNUT was maintained at a higher level in spite of the sleep phase. Mechanosensor, Cx26 and VNUT expressed with circadian rhythm in the mouse bladder mucosa. The disruption of circadian rhythms in these genes, induced by the abnormalities in clock genes, may be factors contributing to NOC because of hypersensitivity to bladder wall extension.