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Discovering therapeutic epigenetic targets using whole genome siRNA screening

Research Project

Project/Area Number 16K09321
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Gastroenterology
Research InstitutionNagoya City University

Principal Investigator

okamoto yasuyuki  名古屋市立大学, 医薬学総合研究院(医学), 研究員 (60444973)

Co-Investigator(Kenkyū-buntansha) 林 香月  名古屋市立大学, 医薬学総合研究院(医学), 准教授 (00405200)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsエピジェネティック / DNAメチル化 / エピジェネティクス / スクリーニング / がん治療
Outline of Final Research Achievements

To investigate therapeutic targets which might be effective combination with DNMT inhibitors, we screened a whole genome siRNA library using a colon cancer cell line that harbors a cytomegalovirus (CMV) promoter driven GFP stably integrated and silenced by hypermethylation. The screen was conducted in combination with low dose decitabine. We confirmed top hits by flow cytometry and qRT-PCR. Among them, some genes are known epigenetic regulators such as chromodomain helicase DNA-binding protein 4 (CHD4), activating transcription factor 7 interacting protein (ATF7IP) and DNMT1 itself. CHD4 depletion in combination with DNMT inhibition synergistically reactivated expression of endogenously methylated genes and inhibited cell growth of colon cancer cell lines with minimal effects on the cell growth of non-cancerous cell lines. Depletion of CHD4 alone also inhibited cell growth of colon cancer cell line but not of non-cancerous cell lines.

Academic Significance and Societal Importance of the Research Achievements

抗体薬や免疫療法の登場でがん治療は飛躍的に向上した。そして遺伝子発現制御機構であるエピゲノムをターゲットとした抗がん剤の開発は癌の根治を目指し期待されている。本研究では、大腸癌の細胞株を用いて、エピゲノム異常により制御された遺伝子の再活性化への影響を21360遺伝子すべてで検討した。その結果14遺伝子が候補になった。14遺伝子の中には、機能が全く報告されていない遺伝子もみとめた。この14遺伝子の中には腫瘍と関連のある遺伝子も存在し、細胞実験では抗腫瘍効果もあきらかであった。これらの遺伝子は癌治療の新規標的として期待される。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (4 results)

All 2018

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (1 results) Book (1 results)

  • [Journal Article] 肝炎ウイルス感染が肝細胞に及ぼすエピジェネティックな影響2018

    • Author(s)
      岡本泰幸
    • Journal Title

      肝胆膵

      Volume: 76 Pages: 867-872

    • Related Report
      2018 Research-status Report
  • [Journal Article] Targeting CDK9 Reactivates Epigenetically Silenced Genes in Cancer.2018

    • Author(s)
      Zhang H, Okamoto Y, ISSA JJ
    • Journal Title

      cell

      Volume: 175 Issue: 5 Pages: 1244-1258

    • DOI

      10.1016/j.cell.2018.09.051

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] siRNAスクリーニングを用いた、エピゲノム治療標的の探索2018

    • Author(s)
      岡本 泰幸
    • Organizer
      第14回日本消化管学会総会学術集会
    • Related Report
      2017 Research-status Report
  • [Book] 肝胆膵2018

    • Author(s)
      岡本泰幸
    • Total Pages
      6
    • Publisher
      アークメディア
    • Related Report
      2017 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2021-02-19  

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