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The essential transcriptional factor and its genomic element for the development of p53-deficient tumors

Research Project

Project/Area Number 19K22724
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 57:Oral science and related fields
Research InstitutionNagasaki University

Principal Investigator

ITO Kosei  長崎大学, 医歯薬学総合研究科(歯学系), 教授 (00332726)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
KeywordsT細胞リンパ腫 / p53 / c-Myc / Runx / 骨肉腫 / リンパ腫
Outline of Research at the Start

がん抑制遺伝子p53の賦活化は効果的な抗腫瘍戦略であるが、これまで奏功していない。研究代表者は、p53機能異常に起因する腫瘍の発症・悪性化が、強力な「がん遺伝子」c-Mycの機能亢進に依存し、c-Myc遺伝子制御領域内の特定配列(mR1)に変異を入れることで、効果的にそれを抑制できる可能性を見出した。
そこで本研究は、主にリンパ腫を発症することで早期に死亡するp53-/-マウスにmR1ホモ変異を導入してp53-/-マウスをレスキューできるかどうかを検討する。mR1をターゲットにした革新的な抗がん戦略を提唱したい。

Outline of Final Research Achievements

p53 deficiency and Myc dysregulation are the most frequently associated with human cancers. We have shown that Runx3 plays a role as a central oncogenic role mediating p53 inactivation and Myc upregulation via mR1; the essential genome element for Myc upregulation in osteosarcomagenesis. Here we focus on thymic lymphoma, which accounts for majority of tumours generated by systemic p53 deletion in mice. Mice lacking p53 specifically in T cells mostly succumbed to thymic lymphoma, certifying this Lck-Cre;p53F/F (LP) mouse line as a rational model to study the tumour. Depletion of Runx1, but not Runx3, effectively extended the lifespan of LP mice, phenocopying Myc-depleted LP mice. LP mice with specific mR1 disruption also presented a reduced thymic lymphoma incidence and thus an improved lifespan. These results suggest that Myc upregulation by Runx via mR1 is a common molecular basis for the pathogenesis of p53-deficient tumors across cancer types.

Academic Significance and Societal Importance of the Research Achievements

極めて広範にヒトがんに関与する、p53の不活化とMycの活性化が、mR1とRunxの介在で機能的に連結した。細胞の腫瘍化は複雑であると考えられているが、実際には、根底にシンプルな共通基盤が存在し、そこに関与する責任因子や特定のゲノムエレメントをターゲットにすることで、それを制御できる可能性がある。
現在の抗がん政略は、テーラーメイド医療に代表させるように、個々の遺伝子異常に、個々に特化した分子標的薬で対処している。今回の成果は、この複雑な治療戦略を根本から見直すきっかけを与えている。

Report

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

    (8 results)

All 2020 2019 Other

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Runx2 is essential for the transdifferentiation of chondrocytes into osteoblasts2020

    • Author(s)
      Qin Xin、Jiang Qing、Nagano Kenichi、Moriishi Takeshi、Miyazaki Toshihiro、Komori Hisato、Ito Kosei、Mark Klaus von der、Sakane Chiharu、Kaneko Hitomi、Komori Toshihisa
    • Journal Title

      PLOS Genetics

      Volume: 16 Issue: 11 Pages: 1009169-1009169

    • DOI

      10.1371/journal.pgen.1009169

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Abstract 301: RUNX3 upregulates c-MYC via mR1ーan essential genomic element for p53-deficient osteosarcomagenesis2020

    • Author(s)
      Date Yuki、Otani Shohei、Ueno Tomoya、Ito Kosei
    • Journal Title

      Cancer Research

      Volume: 80(16 Suppl) Issue: 16_Supplement Pages: 301-301

    • DOI

      10.1158/1538-7445.am2020-301

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Oncogenic RUNX3: A Link between p53 Deficiency and MYC Dysregulation.2020

    • Author(s)
      Date Y and Ito K
    • Journal Title

      Molecules and Cells

      Volume: 43 Pages: 176-181

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] RUNX3 upregulates c-MYC via mR1ーan essential genomic element forp53-deficient osteosarcomagenesis2020

    • Author(s)
      Date Yuki、Otani Shohei、Ueno Tomoya、Ito Kosei
    • Organizer
      American Association for Cancer Research Annual Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Oncogenic Runx3 in osteosarcoma development.2019

    • Author(s)
      Kosei Ito
    • Organizer
      第22回 International RUNX Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] p53 represses c-Myc by inhibition of Runx3 to suppress osteosarcoma development.2019

    • Author(s)
      大谷昇平,伊達悠貴,伊藤公成
    • Organizer
      第78回 日本癌学会学術総会
    • Related Report
      2019 Research-status Report
  • [Presentation] mR1 is an essential genomic element for p53-deficient osteosarcomagenesis.2019

    • Author(s)
      伊達悠貴,大谷昇平,伊藤公成
    • Organizer
      第78回 日本癌学会学術総会
    • Related Report
      2019 Research-status Report
  • [Remarks] 長崎大学大学院医歯薬学総合研究科 分子硬組織生物学

    • URL

      http://www.de.nagasaki-u.ac.jp/dokuji/mbb/

    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2022-01-27  

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