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Pathophysiological investigation of the hypoactive bladder using multiple models caused by defunctionalization, neurogenic, and obstruction

Research Project

Project/Area Number 21K09379
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 56030:Urology-related
Research InstitutionInternational University of Health and Welfare

Principal Investigator

Inoue Takamitsu  国際医療福祉大学, 国際医療福祉大学成田病院, 教授 (60375243)

Co-Investigator(Kenkyū-buntansha) 高岡 栄一郎  自治医科大学, 医学部, 准教授 (50625340)
根来 宏光  筑波大学, 医学医療系, 准教授 (80708595)
Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords廃用性萎縮膀胱 / 低活動膀胱 / 遺伝子発現 / 再生医療 / 膀胱機能回復 / 廃用性萎縮
Outline of Research at the Start

①ウサギ廃用性膀胱萎縮モデル(DRBウサギ)をラットにおいて再現し、「DRBラット」を確立し、ウサギで捉えた膀胱機能回復に関わる遺伝子発現の変化をラットの蛋白レベルで検証できるか?を確認する。②「骨盤神経損傷ラット」「尿路部分閉塞ラット」および「DRB ラット」の3モデルの長期経過観察における、膀胱線維化ひいては非代償性膀胱機能不全とアンギオテンシン受容体シグナルの共通点は何か?を調べる。③AT1あるいはAT2アンタゴニストやアゴニストによる薬物介入効果を評価し、3モデルの共通の現象を探り、低活動膀胱の病態生理解明、薬物治療法、新規再生医療の開発に結びつくかを調べる。

Outline of Final Research Achievements

Rats were divided into sham, atrophy, and recovery groups. In the atrophy group, both ureters were cut and bilateral ureterovaginal anastomosis was performed. On day84, urodynamics study was performed and the bladder was excised in the atrophy group, and in the recovery group, an ureter was re-anastomosed to the atrophic bladder. In the recovery group, urodynamics study was performed and the bladder was excised on day105. For the sham, atrophy, and recovery groups on days0,84, the bladder capacity and compliance were significantly lower in the atrophy group and recovery group on day84 compared to day0. In addition, the recovery group had significantly recovered bladder capacity and compliance on day105. The smooth muscle/interstitial ratio was significantly lower in the atrophy group compared to the sham group, and significantly higher in the recovery group compared to the atrophy group. RNAseq was performed and gene expression changes observed in rabbits were also observed in rats.

Academic Significance and Societal Importance of the Research Achievements

廃用性低活動萎縮膀胱とその回復の動物モデルの報告はこれまで全く行われていなかった。ウサギを使った2つの報告(Lipski,Machado)があるが、本来の生理的状況ではなかった。尿管をラット膣に吻合し萎縮膀胱を作成した1報があるが(Liu)ラットで尿管を再び膀胱へ繋ぐ報告はこれまで行われていない。研究代表者がウサギで確立したモデル(Kisou)は全く新しい低活動膀胱へのアプローチであり、今回の研究でラットへの適用が確立し、蛋白レベルで膀胱再生に繋がる新たな知見が得られる礎が出来た。今後の低活動膀胱における再生医療の進歩に大きく寄与できると考えている。

Report

(4 results)
  • 2024 Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2024 2021

All Presentation (2 results)

  • [Presentation] 両側尿管膣吻合を用いたメスラット尿路変更による廃用性萎縮膀胱モデルの作成2024

    • Author(s)
      井上高光、千原尉智蕗、根来宏光、西山博之、宮﨑淳
    • Organizer
      第111回日本泌尿器科学会総会
    • Related Report
      2023 Research-status Report
  • [Presentation] 長期透析による廃用性萎縮膀胱とその腎移植後の回復~臨床から基礎研究へ2021

    • Author(s)
      井上高光
    • Organizer
      Urology Research Meeting 2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2026-01-16  

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