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Role of viral miRNA on tumorigenesis

Research Project

Project/Area Number 19K22560
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 50:Oncology and related fields
Research InstitutionNagoya University

Principal Investigator

Kimura Hiroshi  名古屋大学, 医学系研究科, 教授 (30303621)

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: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
KeywordsEBウイルス / miRNA
Outline of Research at the Start

Epstein-Barr virus (EBV) は、ほとんどの成人に感染している普遍的なウイルスであるが、様々なリンパ腫/白血病の原因ともなる。ありふれたEBVがなぜ一部の個体にのみリンパ腫を引き起こすのかについては謎である。我々はEBV関連リンパ腫患者に対して、次世代シーケンサーを用いた網羅的遺伝子解析を行い、高率にEBV遺伝子の一部が欠失すること、そしてこの欠失はウイルスがコードするmiRNAの領域に集中していることを発見した。本研究では、ウイルスmiRNAを欠損した組換えEBVを作成し、ヒト化マウスを用いたin vivoモデルでmiRNAの役割を解明する。

Outline of Final Research Achievements

Recently, we have found that there is a high rate of deletion of part of the EBV gene in patients with EBV-related lymphoma. Attempts were made to generate recombinant EBVs lacking the region containing the most frequently deleted viral miRNAs, but none of the produced viruses were infectious and did not lead to infection experiments. Next, a mutant EBV lacking BALF5 (viral DNA polymerase), which was the second most concentrated deletion, was created, and the established human B cell line was transplanted into immunodeficient mice. Lymphoma forming ability with BALF5-deleted EBV was increased in comparison with the wild-type strain. In addition, the BALF5-deficient B cell line had enhanced immediate-early / early genes as compared with the wild-type strain.

Academic Significance and Societal Importance of the Research Achievements

期間内にmiRNA欠失の果たす役割の解明は果たせなかったが、欠損ウイルスでは、EBV前初期遺伝子/初期遺伝子の発現亢進により、宿主細胞増殖と染色体不安定性が促進され、ドライバー遺伝子変異の蓄積、エピジェネッティック修飾が加わり、リンパ腫/白血病と変容すると考えている。欠損ウイルスの腫瘍化機構が明らかになれば、EBV関連リンパ腫のみならず上咽頭がん・胃がんなどEBV関連上皮系腫瘍に共通する分子機構、さらには他の腫瘍ウイルスの発がんメカニズムが解明できる可能性がある。

Report

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

    (3 results)

All 2021 2020

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

  • [Journal Article] Role of Epstein-Barr Virus C Promoter Deletion in Diffuse Large B Cell Lymphoma2021

    • Author(s)
      Mabuchi Seiyo、Hijioka Fumiya、Watanabe Takahiro、Yanagi Yusuke、Okuno Yusuke、Masud H. M. Abdullah Al、Sato Yoshitaka、Murata Takayuki、Kimura Hiroshi
    • Journal Title

      Cancers

      Volume: 13 Issue: 3 Pages: 561-561

    • DOI

      10.3390/cancers13030561

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] RNAseq analysis identifies involvement of EBNA2 in PD-L1 induction during Epstein-Barr virus infection of primary B cells2021

    • Author(s)
      Yanagi Yusuke、Okuno Yusuke、Narita Yohei、Masud H.M. Abdullah Al、Watanabe Takahiro、Sato Yoshitaka、Kanda Teru、Kimura Hiroshi、Murata Takayuki
    • Journal Title

      Virology

      Volume: 557 Pages: 44-54

    • DOI

      10.1016/j.virol.2021.02.004

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Chronic Epstein-Barr virus lymphoproliferative disease2020

    • Author(s)
      Hiroshi Kimura
    • Organizer
      12th T-cell Lymphoma Forum
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited

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

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