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Investigating a novel therapeutic strategy for preleukemic clonal hematopoiesis based on proinflammatory cytokine-mediated cell extrinsic mechanism of clonal expansion

Research Project

Project/Area Number 19K17864
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 54010:Hematology and medical oncology-related
Research InstitutionYokohama City University

Principal Investigator

KUNIMOTO Hiroyoshi  横浜市立大学, 医学部, 助教 (80464923)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsTET2 / GM-CSF / クローン性造血 / 慢性骨髄単球性白血病 / Tet2 / 造血幹細胞 / 炎症性サイトカイン
Outline of Research at the Start

急性骨髄性白血病や前白血病状態のクローン造血に機能喪失型のTET2変異が高頻度に検出されている。申請者らはこれまでにTET2の機能喪失がクローン造血を引き起こすことを明らかにした。最近、TET2変異を有する血液細胞が炎症性サイトカインであるIL-1βの産生を介して様々な炎症を惹起することが明らかになってきた。
そこで本研究では、TET2の機能喪失がIL-1βを介してクローン造血の拡大をもたらすメカニズムを明らかにし、そのメカニズムの阻害がクローン造血発生を抑制しうるかを検討する。本研究の成果は、TET2変異陽性クローン造血の発生機序の解明と、新たな白血病発症予防法の開発につながると期待される。

Outline of Final Research Achievements

We first cultured wild-type (WT) or Tet2-null murine BM cells with or without proinflammatory (IL-1β, IL-6, IFNγ) or myelomonocytic (G-CSF, M-CSF, GM-CSF) cytokines in methylcellulose media. In contrast to our initial hypothesis, IL-1β did not induce enhanced replating capacity of Tet2-null hematopoietic stem/progenitor cells (HSPCs) in vitro. On the other hand, GM-CSF suppressed clonogenicity of WT cells while enhanced both clonogenicity and replating capacity of Tet2-null HSPCs. Intriguingly, GM-CSF stimulation induced differentiation toward CD11b+ myelomonocytes and increased both Annexin V+ apoptotic cells and proliferative cells in S/G2/M phase in WT cells, whereas Tet2-null cells were resistant to these differentiative/apoptotic/proliferative effects induced by GM-CSF. These data suggest that Tet2 loss confers HSPCs with functional resistance to GM-CSF stress, leading to enhanced self-renewal and decreased apoptosis of Tet2-null HSCs.

Academic Significance and Societal Importance of the Research Achievements

TET2変異陽性クローン性造血及び慢性骨髄単球性白血病の拡大・進展過程における骨髄単球系サイトカインGM-CSFの役割が明らかにされた。今後野生型及びTet2欠失細胞におけるGM-CSFシグナルの変化やその分子基盤に着目することで、TET2変異陽性クローン性造血や血液腫瘍発生過程におけるGM-CSFシグナルの重要性や治療標的としての可能性も明らかになると期待され、臨床医学的意義は大きいと考える。

Report

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

    (8 results)

All 2021 2020 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (3 results) Remarks (1 results)

  • [Journal Article] OGT Regulates Hematopoietic Stem Cell Maintenance via PINK1-Dependent Mitophagy2021

    • Author(s)
      Murakami Koichi、 ... 、Takubo Keiyo、Okamoto Shinichiro、Tamura Tomohiko、Nakajima Hideaki
    • Journal Title

      Cell Reports

      Volume: 34 Issue: 1 Pages: 108579-108579

    • DOI

      10.1016/j.celrep.2020.108579

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] TET2: A cornerstone in normal and malignant hematopoiesis2020

    • Author(s)
      Kunimoto Hiroyoshi、Nakajima Hideaki
    • Journal Title

      Cancer Science

      Volume: 112 Issue: 1 Pages: 31-40

    • DOI

      10.1111/cas.14688

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Establishment of a High-risk MDS/AML Cell Line YCU-AML1 and its Xenograft Model Harboring t(3;3) and Monosomy 72020

    • Author(s)
      Kunimoto Hiroyoshi、Fukuchi Yumi、Murakami Koichi、Ikeda Junji、Teranaka Hiroshi、Kato Ikuma、Miyazaki Takuya、Enaka Makiko、Mitsuhashi Takayuki、Yamazaki Etsuko、Kameyama Kaori、Murata Mitsuru、Okamoto Shinichiro、Nakajima Hideaki
    • Journal Title

      HemaSphere

      Volume: 4 Issue: 5

    • DOI

      10.1097/hs9.0000000000000469

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Clonal hematopoiesis: Molecular basis and clinical relevance2020

    • Author(s)
      Kunimoto Hiroyoshi、Nakajima Hideaki
    • Journal Title

      Leukemia Research

      Volume: 98 Pages: 106457-106457

    • DOI

      10.1016/j.leukres.2020.106457

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 3番染色体転座と7番染色体欠失を有する高リスクMDS/AMLからの細胞株と異種移植モデルの樹立2020

    • Author(s)
      國本博義・福地由美・村上紘一・池田順治・寺中寛・加藤生真・宮崎拓也・江中牧子・三ツ橋雄之・山崎悦子・亀山香織・村田満・岡本真一郎・中島秀明
    • Organizer
      第82回日本血液学会学術集会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 忠実度の高いヒト高リスクMDS/AMLモデルの構築2020

    • Author(s)
      國本博義・村上紘一・池田順治・寺中寛・加藤生真・宮崎拓也・江中牧子・三ツ橋雄之・山崎悦子・亀山香織・村田満・岡本真一郎・中島秀明
    • Organizer
      第24回造血器腫瘍研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 忠実度の高いヒト高リスクMDS/AMLモデルの構築2020

    • Author(s)
      國本 博義
    • Organizer
      第24回造血器腫瘍研究会
    • Related Report
      2019 Research-status Report
  • [Remarks] 横浜市立大学大学院 医学研究科 幹細胞免疫制御内科学 血液グループ 研究内容

    • URL

      http://www.ycuhri.com/research/blood.html

    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2022-01-27  

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