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Analysis of regulatory mechanisms of Wnt signaling in bone formation

Research Project

Project/Area Number 20K18009
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56020:Orthopedics-related
Research InstitutionSaitama Medical University

Principal Investigator

Tsukamoto Sho  埼玉医科大学, 医学部, 助教 (20707658)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords骨形成 / Wnt / シグナル伝達 / 骨系統疾患 / 骨代謝 / 骨・軟骨代謝
Outline of Research at the Start

骨は、生涯に渡り骨形成と骨吸収を繰り返して再構築される。Wntシグナルの活性化は、骨形成を強力に促進することが知られており、Wntシグナルを亢進させる薬剤が骨粗鬆症の治療薬として使用されている。しかし、Wntは19種類の存在が知られており、どのWntが生理的骨形成に重要なのか未だ明らかとなっていない。我々は、誘導型Wnt7b 欠失マウスを樹立し、出生後にWnt7bを欠失させると骨量が減少することを見出した。本研究では、組織学的及び細胞生物学的解析から、Wnt7bを介したシグナルの生理的な骨形成に対する役割を解明することを目的とする。

Outline of Final Research Achievements

Wnt proteins stimulates bone formation. It is still unclear which Wnt ligands are important for bone formation, because the 19 different types of Wnt are identified in mammal. Recently, our group found that bone formation was enhanced in Smad4 conditional knockout mice through an increase in the expression of Wnt7b. We established tamoxifen-inducible Wnt7b conditional knockout (Wnt7b cKO). The juvenile Wnt7b cKO mice were small and showed dwarfism phenotypes. Bone analysis revealed that bone length in Wnt7b cKO mice was shorter than that of control mice. Histological sections of long bones revealed that the volume of trabecular bones were decreased in Wnt7b cKO mice compared to the control mice. These results suggest that Wnt7b is a critical inducer of bone formation during endochondral ossification.

Academic Significance and Societal Importance of the Research Achievements

本研究から、Wnt7bが生理的な骨形成を亢進する重要な因子である可能性を見出した。実際に、Wnt7bは、骨形成を担う骨芽細胞の分化を促進したことから、Wnt7bを介したシグナルが骨粗鬆症等の骨疾患の新たな治療標的となる可能性がある。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 Other

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

  • [Journal Article] Accumulated Knowledge of Activin Receptor-Like Kinase 2 (ALK2)/Activin A Receptor, Type 1 (ACVR1) as a Target for Human Disorders2021

    • Author(s)
      Katagiri T, Tsukamoto S, Kuratani M
    • Journal Title

      Biomedicines

      Volume: 9 Issue: 7 Pages: 736-736

    • DOI

      10.3390/biomedicines9070736

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Establishment of an in vivo model of ectopic calcification in mouse skeletal muscle.2021

    • Author(s)
      Tsukamoto S, Kuratani M, Hamai R, Tsuchiya K, Suzuki O, Yamada T, Katagiri T
    • Organizer
      ASBMR 2021 Annual meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] マウス骨格筋における異所性石灰化モデルの確立と解析2021

    • Author(s)
      塚本翔、倉谷麻衣、鈴木 治、片桐岳信
    • Organizer
      第39回日本骨代謝学会学術集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] びまん性特発性骨増殖症に関連するALK2 K400E変異体の機能解析2020

    • Author(s)
      塚本翔、倉谷麻衣、片桐岳信
    • Organizer
      第38回日本骨代謝学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Functional characterization of a unique mutant of ALK2, p.K400E, that is associated with a skeletal disorder, diffuse idiopathic skeletal hyperostosis2020

    • Author(s)
      Sho Tsukamoto, Mai Kuratani, Takenobu Katagiri
    • Organizer
      ASBMR(米国骨代謝学会)2020
    • Related Report
      2020 Research-status Report
  • [Remarks] 埼玉医科大学 ゲノム基礎医学

    • URL

      http://www.saitama-med.ac.jp/uinfo/biomedsci/index.html

    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2023-01-30  

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