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Identification and visualization of pathological osteoclasts in arthritis

Research Project

Project/Area Number 19K23967
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0902:General internal medicine and related fields
Research InstitutionOsaka University

Principal Investigator

Hasegawa Tetsuo  大阪大学, 医学系研究科, 招へい教員 (30773048)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords破骨細胞 / 関節リウマチ / 生体イメージング / 病的骨破壊
Outline of Research at the Start

骨破壊を担うユニークな多核細胞である破骨細胞は、「骨髄」で骨の恒常性維持に重要な役割を果たす一方、関節リウマチ(RA)では「関節」の病的な骨破壊を惹起する。これまで骨髄の破骨細胞やin vitroで培養して分化させた破骨細胞様細胞の研究は精力的に行われてきたが、関節で病原性骨破壊を担う破骨細胞の研究はほとんど行われていない。申請者は、独自に編み出したプロトコールを用いて滑膜のパンヌスの破骨前駆細胞を同定すると共に、病原性破骨細胞を二光子励起顕微鏡を用いて可視化することで、病原性骨破壊のメカニズムを解明する。

Outline of Final Research Achievements

Osteoclasts are multinucleated cells with unique bone-destroying capacity. They play key roles in maintaining homeostatic bone remodeling inside the bone marrow (BM), while they are also involved in pathological bone destruction in arthritis. However, the difference between these osteoclasts in the two tissue settings have not been clarified. Here, we used two-photon microscopy to directly visualize the mature osteoclasts both in the BM and pannus-bone interface. This showed that pathological osteoclasts are actively resorbing the bone matrix in the tiny resorption pits without migrating on the bone surface. This contrasts with the physiological osteoclasts in the BM, which are in close contact with osteoblasts and slowly migrate on the bone surface. These results imply that the manner of bone resorption differs between the osteoclast populations in the two tissues, and this system can serve as a platform for exploring the dynamics of osteoclasts within the synovial microenvironment.

Academic Significance and Societal Importance of the Research Achievements

関節リウマチは関節の慢性的な炎症をきたす代表的な自己免疫疾患で、最終的に「破骨細胞」と呼ばれる細胞が骨を破壊することで関節の機能を大きく低下させます。近年、関節リウマチに対する治療薬は大きな進歩を遂げた一方、いまだにいずれの治療薬にも反応しない難治性の患者さんが存在します。本研究により、関節破壊を惹起する病的な破骨細胞の特徴やその骨破壊のメカニズムが詳細に解析されることで、病的な破骨細胞のみを標的とした新規薬剤の開発につながることが期待されます。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Visualizing bone tissue in homeostatic and pathological conditions2020

    • Author(s)
      HASEGAWA Tetsuo、ISHII Masaru
    • Journal Title

      Proceedings of the Japan Academy, Series B

      Volume: 96 Issue: 2 Pages: 43-49

    • DOI

      10.2183/pjab.96.004

    • NAID

      130007796072

    • ISSN
      0386-2208, 1349-2896
    • Year and Date
      2020-02-10
    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of an intravital imaging system for the synovial tissue reveals the dynamics of CTLA-4 Ig in vivo2020

    • Author(s)
      Hasegawa Tetsuo、Kikuta Junichi、Sudo Takao、Yamashita Erika、Seno Shigeto、Takeuchi Tsutomu、Ishii Masaru
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 13480-13480

    • DOI

      10.1038/s41598-020-70488-y

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of a novel arthritis-associated osteoclast precursor macrophage regulated by FoxM1.2019

    • Author(s)
      Hasegawa T, Kikuta J, Sudo T, Matsuura Y, Matsui T, Simmons S, Ebina K, Hirao M, Okuzaki D, Yoshida Y, Hirao A, Kalinichenko VV, Yamaoka K, Takeuchi T, Ishii M.
    • Journal Title

      Nat Immunol.

      Volume: 20 Issue: 12 Pages: 1631-1643

    • DOI

      10.1038/s41590-019-0526-7

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Imaging the Bone-Immune Cell Interaction in Bone Destruction2019

    • Author(s)
      Hasegawa Tetsuo、Kikuta Junichi、Ishii Masaru
    • Journal Title

      Frontiers in Immunology

      Volume: 10 Pages: 1-7

    • DOI

      10.3389/fimmu.2019.00596

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Development of intravital imaging system for the synovial tissue and pannus.2020

    • Author(s)
      Hasegawa T
    • Organizer
      第64回日本リウマチ学会学術集会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Identification of arthritis-associated osteoclast precursor macrophages in the joint2020

    • Author(s)
      Hasegawa T
    • Organizer
      第38回日本骨代謝学会学術集会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] The origin of osteoclasts in pannus2019

    • Author(s)
      Tetsuo Hasegawa
    • Organizer
      17th International Congress of Immunology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Identification of arthritis-associated osteoclast precursor macrophages in pannus2019

    • Author(s)
      Tetsuo Hasegawa
    • Organizer
      第48回日本免疫学会学術集会
    • Related Report
      2019 Research-status Report
  • [Presentation] Identification of arthritis-associated osteoclast precursor macrophages in pannus2019

    • Author(s)
      Tetsuo Hasegawa
    • Organizer
      第6回JCRベーシックリサーチカンファレンス
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2022-01-27  

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