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The elucidation of urine reabsorption mechanism in the bladder

Research Project

Project/Area Number 17K11190
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Urology
Research InstitutionNara Medical University

Principal Investigator

Torimoto Kazumasa  奈良県立医科大学, 医学部, 講師 (10382293)

Co-Investigator(Kenkyū-buntansha) 國安 弘基  奈良県立医科大学, 医学部, 教授 (00253055)
藤本 清秀  奈良県立医科大学, 医学部, 教授 (50264867)
三宅 牧人  奈良県立医科大学, 医学部, 助教 (80601400)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords膀胱吸収 / 夜間頻尿 / ラット / アクアポリン / 膀胱 / 再吸収 / 泌尿器科 / 生理学
Outline of Final Research Achievements

We demonstrated a part of the absorption mechanism of water and sodium in the rat bladder. When saline is infused into the bladder and the volume exceeds the functional bladder capacity (physiological voided volume per micturition), water and sodium are absorbed. Water is absorbed via aquaporin (AQP) 2 and sodium is related to the increased expression of AQP2. The uptake of sodium may be mediated by intercellular claudins rather than epithelial Na channels.

Academic Significance and Societal Importance of the Research Achievements

動物およびヒトを対象にした実験で膀胱において水および電解質を含む低分子が吸収されることは証明されていたが、特にヒトにおける生理的意義は不明であった。Watanabeらが就寝中に排尿しない被験者を対象に、超音波走査を用いて「膀胱で尿が吸収されて容量が調整される」ことを強く示唆する研究結果を報告した。これは、夜間排尿を回避して睡眠を維持することに寄与する傍証であり、夜間頻尿の病態を再考させる成果である。我々の研究はこの機構の一端を解明することに成功し、新たな治療戦略を考案する契機となる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (7 results)

All 2020 2019 2018 2017

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Sodium plays an important role in the absorption of intravesical fluid2020

    • Author(s)
      Yosuke Morizawa, Kazumasa Torimoto, Shunta Hori, Daisuke Gotoh, Yasushi Nakai, Makito Miyake, Nobumichi Tanaka, Akihide Hirayama, Kiyohide Fujimoto
    • Journal Title

      Lower Urinary Tract Symptoms

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of bladder distension on arginine vasopressin secretion in rats2019

    • Author(s)
      Morizawa Y, Torimoto K, Hori S, Gotoh D, Nakai Y, Miyake M, Fujimoto K
    • Journal Title

      BMC Research Notes

      Volume: 12 Issue: 1 Pages: 72-72

    • DOI

      10.1186/s13104-019-4105-7

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Aquaporin-2 plays an important role in water transportation through the bladder wall in rats2018

    • Author(s)
      Morizawa Yosuke、Torimoto Kazumasa、Hori Shunta、Gotoh Daisuke、Nakai Yasushi、Miyake Makito、Hirayama Akihide、Tanaka Nobumichi、Fujimoto Kiyohide
    • Journal Title

      Neurourology and Urodynamics

      Volume: 37 Issue: 8 Pages: 2434-2440

    • DOI

      10.1002/nau.23715

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Aquaporin-2 plays an important role in water transportation through the bladder wall in rats2018

    • Author(s)
      Yosuke Morizawa, Kazumasa Torimoto, Shunta Hori, Daisuke Gotoh, Yasushi Nakai, Makito Miyake, Akihide Hirayama, Nobumichi Tanaka, Kiyohide Fujimoto
    • Journal Title

      Neurourology and Urodynamics

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 膀胱における水およびNa再吸収機構の検討2018

    • Author(s)
      森澤洋介 鳥本一匡 後藤大輔 堀俊太 中井靖 三宅牧人 田中宣道 藤本清秀
    • Organizer
      第68回日本泌尿器科学会中部総会
    • Related Report
      2018 Research-status Report
  • [Presentation] Role of the Urinary Bladder in Water Metabolism - How Does the Bladder Absorb Urine?2017

    • Author(s)
      Morizawa Y, Torimoto K, Miyake M, Hori S, Gotoh D, Tatsumi Y, Nakai Y, Onishi S, Tanaka N, Watanabe H, Fujimoto K
    • Organizer
      Intenational Continence Society 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 膀胱における尿再吸収機構の解明2017

    • Author(s)
      森澤洋介、鳥本一匡、三宅牧人、後藤大輔、飯田孝太、大西健太、堀俊太、辰巳佳弘、中井靖、大西さゆり、田中宣道、藤本清秀
    • Organizer
      第24回日本排尿機能学会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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