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<p>Mammals exhibit a circadian rhythm of bladder capacity, but whether this rhythm can be maintained through intrinsic bladder mechanisms independently of central clock-driven behavioral rhythms remains unclear. Here, we addressed this question using <i>Bmal1</i> conditional knockout mice lacking central clock function in the brain. Under constant darkness, these mice lost behavioral rhythmicity but largely retained circadian variation in bladder capacity together with bladder clock gene expression. Transcriptomic analyses further identified diurnal variation in bladder extracellular matrix–related factors, suggesting a potential molecular basis for bladder capacity rhythmicity. These findings indicate that the bladder harbors a peripheral circadian mechanism that contributes to the circadian regulation of bladder capacity and provides insight into the role of peripheral clock mechanisms in bladder pathophysiology.</p>

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Circadian regulation of bladder capacity and extracellular matrix variation independent of central clock–driven behavioral rhythms

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月14日

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  • Shuhei Suzuki,
  • Hiromitsu Negoro,
  • Haruna Nonaka,
  • Ichiro Chihara,
  • Yoshiyuki Nagumo,
  • Shuya Kandori,
  • Shigeki Shimba,
  • Kenichi Kimura,
  • Hiromi Yanagisawa,
  • Hiroyuki Nishiyama

摘要

Mammals exhibit a circadian rhythm of bladder capacity, but whether this rhythm can be maintained through intrinsic bladder mechanisms independently of central clock-driven behavioral rhythms remains unclear. Here, we addressed this question using Bmal1 conditional knockout mice lacking central clock function in the brain. Under constant darkness, these mice lost behavioral rhythmicity but largely retained circadian variation in bladder capacity together with bladder clock gene expression. Transcriptomic analyses further identified diurnal variation in bladder extracellular matrix–related factors, suggesting a potential molecular basis for bladder capacity rhythmicity. These findings indicate that the bladder harbors a peripheral circadian mechanism that contributes to the circadian regulation of bladder capacity and provides insight into the role of peripheral clock mechanisms in bladder pathophysiology.