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Functional analysis of a novel NELL-Robo signaling system in osteogenesis

Research Project

Project/Area Number 20H02948
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 38060:Applied molecular and cellular biology-related
Research InstitutionNagoya University

Principal Investigator

Niimi Tomoaki  名古屋大学, 生命農学研究科, 講師 (30377791)

Co-Investigator(Kenkyū-buntansha) 水谷 公彦  京都大学, 農学研究科, 助教 (40314281)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Keywords軸索誘導因子 / シグナル伝達 / 骨芽細胞 / 再生医療 / FRET解析 / タンパク質
Outline of Research at the Start

骨形成を促進する働きのあるタンパク質NELL1とその受容体Robo2が結合する仕組みの解明、NELL1とRobo2の結合により誘導される下流のシグナル伝達経路(NELL-Roboシグナル)の同定を通して、NELL-Roboシグナルが骨組織形成で果たす役割を解明し、NELL1およびRobo2遺伝子やこれらの組換えタンパク質を用いた新奇骨形成因子の創成のための基盤研究を行う。

Outline of Final Research Achievements

The NELL1 gene was originally identified in craniosynostosis patients as being specifically upregulated within prematurely fusing sutures. Because of its potent osteoinductive activity, NELL1 protein may be useful for bone regeneration therapy. However, there is little knowledge regarding NELL1-mediated signaling pathways. In this study, we focused on the property that NELL1 and its novel receptor, ROBO2, bind only in acidic conditions to elucidate the signaling mechanism of the NELL-ROBO complex. The results revealed that the NELL1/2 and ROBO1/2/3 families bind in a pH-dependent manner, suggesting the existence of a pH-dependent signal transduction regulatory mechanism.

Academic Significance and Societal Importance of the Research Achievements

骨再生療法への応用を目指して、骨形成能を有するNELL1タンパク質のシグナル伝達機構の解明に取り組み、NELLファミリーリガンドとその新奇受容体であるRoboファミリーのpH依存的な複合体形成のメカニズムを発見した。このことは細胞外pHの変動によるシグナル伝達制御機構が存在することを示唆しており、NELLおよびRoboファミリータンパク質がともに発現している組織や器官においては、細胞外pHの制御が疾患の治療や創薬のターゲットとなり得ることを示している。

Report

(5 results)
  • 2024 Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (6 results)

All 2025 2022 2021

All Journal Article (5 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results)

  • [Journal Article] Glu592 of the axon guidance receptor ROBO3 mediates a pH‐dependent interaction with NELL2 ligand2025

    • Author(s)
      Mizutani Kimihiko、Toyoda Mayuko、Ojima‐Kato Teruyo、Maturana Andres D.、Niimi Tomoaki
    • Journal Title

      FEBS Letters

      Volume: 599 Issue: 4 Pages: 571-580

    • DOI

      10.1002/1873-3468.15054

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conformational Change of the Hairpin-like-structured Robo2 Ectodomain Allows NELL1/2 Binding2022

    • Author(s)
      Miyaguchi Masaki、Nakanishi Yoichi、Maturana Andr?s D.、Mizutani Kimihiko、Niimi Tomoaki
    • Journal Title

      Journal of Molecular Biology

      Volume: 434 Issue: 19 Pages: 167777-167777

    • DOI

      10.1016/j.jmb.2022.167777

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 骨形成を促進する新奇因子NELL1の骨誘導分子基盤の解明2021

    • Author(s)
      新美友章
    • Journal Title

      Precision Medicine

      Volume: 4 Pages: 884-886

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Roles of Slit Ligands and Their Roundabout (Robo) Family of Receptors in Bone Remodeling2021

    • Author(s)
      Tomoaki Niimi
    • Journal Title

      Adv. Exp. Med. Biol.

      Volume: 21 Pages: 143-154

    • DOI

      10.1007/5584_2020_586

    • ISBN
      9783030678135, 9783030678142
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 骨形成を促進する新奇因子NELL1の骨誘導分子基盤の解明2021

    • Author(s)
      新美友章
    • Journal Title

      Medical Science Digest

      Volume: 47 Pages: 106-107

    • Related Report
      2020 Annual Research Report
  • [Presentation] 骨分化誘導タンパク質NELL1の新奇受容体候補Robo2の構造特性解析2021

    • Author(s)
      宮口昌樹、中西洋一、新美友章
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2026-01-16  

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