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An analysis for development of myelodysplastic syndrome and influence of ROS

Research Project

Project/Area Number 18K07073
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49030:Experimental pathology-related
Research InstitutionTokai University

Principal Investigator

ONIZUKA Makoto  東海大学, 医学部, 准教授 (80366012)

Co-Investigator(Kenkyū-buntansha) 八幡 崇  東海大学, 医学部, 准教授 (10398753)
石井 恭正  東海大学, 医学部, 准教授 (20548680)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords骨髄異形成症候群 / 酸化ストレス / Sdhc-mut マウス / 全エクソンシークエンス / ミトコンドリア / complex II / ミトコンドリア複合体II / ROS / 全エクソン解析 / 脂肪細胞 / PAI-1 / Sdhc変異マウス / ROS過剰産生 / myeloid-skewing / 活性酸素 / 造血幹細胞移植 / 造血幹細胞 / 造血ホメオスタシス / mev1
Outline of Final Research Achievements

This study aimed to investigate the effects of a conditional Sdhc missense mutation, which results in the production of excessive reactive oxygen species (ROS), on HSC maintenance and differentiation. Although 3-month-old Sdhc mutant mice (Sdhc-mut) exhibited similar peripheral blood cell counts to wildtype mice (WT), 24-month-old Sdhc-mut showed myeloid skew, anemia, and thrombocytosis. In the competitive repopulation assay, the young Sdhc-mut BM, compared with WT, exhibited 5-fold lower donor chimerism and myeloid-skewed hematopoiesis. Serial transplantation revealed the exhaustion of the mutant-derived cell population. After transplantation, Sdhc-mut HSCs exhibited accumulation of excessive ROS and γH2AX foci. Whole exon sequencing showed a significant increase in SNV and indel mutation in recipient mice of Sdhc-mut BM. These results indicate that MCII dysfunction and accumulation of ROS drives HSC aging, leading to the development of clonal hematopoiesis.

Academic Significance and Societal Importance of the Research Achievements

発症年齢中央値が69歳である骨髄異形成症候群は、高齢化が顕著な世界各国において、今後症例数が多くなると見込まれている。今回、マウスモデルにおいてミトコンドリア機能異常から、加齢や複製ストレスによってROS-p38シグナル活性化とDNA損傷がより起こり、これが変異マウスの造血幹細胞に老化や遺伝子変異をもたらすことを明らかにしている。このマウスモデルは特定の遺伝子に限定されないクローン造血を引き起こすと考えられ、骨髄異形成症候群発症の母体となると推測された。今後クローン造血、骨髄異形成症候群の研究に応用していくことができると期待される。骨髄異形成症候群の発症メカニズムにせまる研究である。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2021 2020

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

  • [Journal Article] Plasminogen activator inhibitor type-1 is a negative regulator of hematopoietic regeneration in the adipocyte-rich bone marrow microenvironment2021

    • Author(s)
      Harada Kaito、Yahata Takashi、Onizuka Makoto、Ibrahim Abd Aziz、Kikkawa Eri、Miyata Toshio、Ando Kiyoshi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 557 Pages: 180-186

    • DOI

      10.1016/j.bbrc.2021.04.017

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] MITOCHONDRIAL ELECTRON TRANSPORT CHAIN COMPLEX II DYSFUNCTION DRIVES PREMATURE AGING OF HEMATOPOIETIC STEM CELLS2020

    • Author(s)
      Kaito Harada*, Takashi Yahata, Makoto Onizuka, Takamasa Ishii, Abd Aziz Ibrahim, Eri Kikkawa, Yoichi Gondo, Kiyoshi Ando
    • Organizer
      第25回欧州血液学会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mitochondrial complex II dysfunction leads to hematopoietic stem cells aging and myelodysplastic syndrome2020

    • Author(s)
      Kaito Harada*, Takashi Yahata, Makoto Onizuka, Takamasa Ishii, Abd Aziz Ibrahim, Eri Kikkawa, Yoichi Gondo,Kiyoshi Ando
    • Organizer
      日本血液学会
    • Related Report
      2020 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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