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Studies on the mechanisms that ensure the biliary epithelial tissue integrity during the dynamic tissue remodeling process

Research Project

Project/Area Number 21H02518
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 44040:Morphology and anatomical structure-related
Research InstitutionThe University of Tokyo

Principal Investigator

Itoh Tohru  東京大学, 定量生命科学研究所, 協力研究員 (50396917)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2023: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2022: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Keywords上皮管腔組織 / 胆管 / 組織リモデリング / 肝再生 / オルガノイド / 組織構造の維持 / 上皮管腔組織形成 / イメージング
Outline of Research at the Start

生体組織の秩序だった構造が安定に『維持』されるメカニズムの解明は、種々の疾患の発症機構や組織老化の仕組みを理解するうえで重要である。本研究課題では、肝内胆管の樹状上皮組織構造の崩壊過程を時系列を追って観察可能な独自の実験系を駆使した種々の解析を実施する。胆管組織の崩壊と維持において鍵となる細胞動態と、これに関わる遺伝子機能を明らかにすることで、管腔上皮組織構造の維持に関わる新たな分子メカニズムの解明を目指す。

Outline of Final Research Achievements

Under various types of liver injury conditions, the intrahepatic biliary epithelial tissue forming the bile duct undergoes dynamic and adaptive structural transformation, also known as the biliary remodeling or the ductular reaction, which plays key roles in the organ regeneration and pathophysiology. In this research project, we aimed to clarify the regulatory mechanisms of the biliary remodeling in liver regeneration, with a particular focus on the biliary-enriched transcription factor Klf5. We have identified a novel cellular mechanism governed by the Klf5-Laminin axis whereby the biliary epithelial tissue maintains its integrity while undergoing unstable structural transformation during the biliary remodeling.

Academic Significance and Societal Importance of the Research Achievements

これまでの胆管リモデリングに関する研究は、もっぱら胆管周囲の組織・細胞からのシグナルによる細胞の「増殖」の制御機構に注目して進められてきました。本研究では、胆管組織に自律的なシグナル機構が「組織構造の維持」という新たな細胞機能を介して胆管リモデリングに重要な役割を担うことを初めて明らかにしました。胆管をはじめとする生体内の種々の管腔上皮組織の構造が適切に維持されるメカニズムについてはこれまでほとんど明らかにされておらず、こうした課題にアプローチするための新規かつユニークな解析プラットフォームを提供するものです。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (9 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 7 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Analysis of distribution, collection, and confirmation of capacity dependency of small extracellular vesicles toward a therapy for liver cirrhosis2023

    • Author(s)
      Takeda Nobutaka、Tsuchiya Atsunori、Mito Masaki、Natsui Kazuki、Natusi Yui、Koseki Yohei、Tomiyoshi Kei、Yamazaki Fusako、Yoshida Yuki、Abe Hiroyuki、Sano Masayuki、Kido Taketomo、Yoshioka Yusuke、Kikuta Junichi、Itoh Tohru、Nishimura Ken、Ishii Masaru、Ochiya Takahiro、Miyajima Atsushi、Terai Shuji
    • Journal Title

      Inflammation and Regeneration

      Volume: 43 Issue: 1 Pages: 48-48

    • DOI

      10.1186/s41232-023-00299-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a high throughput system to screen compounds that revert the activated hepatic stellate cells to a quiescent-like state2023

    • Author(s)
      Nakano Yasuhiro、Itoh Tohru、Tanaka Minoru、Miyajima Atsushi、Kido Taketomo
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2023.11.01.564270

    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] Two distinct Notch signals, Delta-like 4/Notch1 and Jagged-1/Notch2, antagonistically regulate chemical hepatocarcinogenesis in mice2022

    • Author(s)
      Nakano Yasuhiro、Nakao Sachie、Sueoka Minako、Kasahara Daigo、Tanno Yuri、Sumiyoshi Hideaki、Itoh Tohru、Miyajima Atsushi、Hozumi Katsuto、Inagaki Yutaka
    • Journal Title

      Communications Biology

      Volume: 5 Issue: 1 Pages: 85-85

    • DOI

      10.1038/s42003-022-03013-8

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] KLF5-regulated extracellular matrix remodeling secures biliary epithelial tissue integrity against cholestatic liver injury2022

    • Author(s)
      Yamada Minami、Okada Hajime、Ema Masatsugu、Kikkawa Yamato、Miyajima Atsushi、Itoh Tohru
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2022.01.25.477619

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] The truth lies somewhere in the middle: the cells responsible for liver tissue maintenance finally identified2021

    • Author(s)
      Itoh Tohru
    • Journal Title

      Cell Regeneration

      Volume: 10 Issue: 1 Pages: 28-28

    • DOI

      10.1186/s13619-021-00090-8

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the Mechanisms of Biliary Flux2021

    • Author(s)
      Vartak Nachiket、Drasdo Dirk、Geisler Fabian、Itoh Tohru、P.J.Oude Elferink Ronald、van de Graaf Stan F.J.、Chiang John、Keitel Verena、Trauner Michael、Jansen Peter、Hengstler Jan G.
    • Journal Title

      Hepatology

      Volume: 74 Issue: 6 Pages: 3497-3512

    • DOI

      10.1002/hep.32027

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Generation of functional liver organoids on combining hepatocytes and cholangiocytes with hepatobiliary connections ex vivo2021

    • Author(s)
      Tanimizu Naoki、Ichinohe Norihisa、Sasaki Yasushi、Itoh Tohru、Sudo Ryo、Yamaguchi Tomoko、Katsuda Takeshi、Ninomiya Takafumi、Tokino Takashi、Ochiya Takahiro、Miyajima Atsushi、Mitaka Toshihiro
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 3390-3401

    • DOI

      10.1038/s41467-021-23575-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Behavior of Reactive Cholangiocytes in the Tissue Repair Stage from Chronic Liver Injury2021

    • Author(s)
      Yasuhiro Nakano, Atsushi Miyajima, Tohru Itoh
    • Organizer
      APASL Single Topic Conference 2021 in Osaka
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 慢性肝障害からの組織修復過程における胆管細胞の挙動解析2021

    • Author(s)
      中野 泰博, 宮島 篤, 伊藤 暢
    • Organizer
      第28回 肝細胞研究会
    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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