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Suppression of hepatitis B virus replication by a microRNA inhibitor

Research Project

Project/Area Number 20K07531
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49060:Virology-related
Research InstitutionTokyo Metropolitan Institute of Medical Science

Principal Investigator

MUNAKATA Tsubasa  公益財団法人東京都医学総合研究所, 疾患制御研究分野, 主席研究員 (50420237)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsB型肝炎ウイルス / マイクロRNA / 治療薬 / 抗ウイルス薬 / 動物モデル / HBV / miRNA / ヒト肝臓キメラマウス / 阻害剤 / マイクRNA / B型肝炎 / ウイルス / HBs抗原
Outline of Research at the Start

我々はB型肝炎ウイルス(HBV)感染動物モデルを用いて、HBVの持続感染により発現変動するmiRNAを4種類同定した。その内の一つ、miR-4453の機能解析を行った結果、HBV複製を促進する宿主因子であることが判明した。逆にmiR-4453の阻害剤をHBV感染細胞に加えたところ、ウイルス複製が抑制された。この抗HBV作用はin vitroだけでなくin vivoでも示された。従って、新しい機序によるHBVの治療薬になり得ると考えている。本研究においては、miRNA阻害剤による抗ウイルス作用のメカニズムを解析すると共に、HBV感染動物モデルであるヒト肝臓キメラマウスでの詳細な解析も進める。

Outline of Final Research Achievements

During the research of hepatitis B virus (HBV) life cycle, we have found that miR-4453, binding to the 5'epsilon signal of HBV pregenomic RNA (pgRNA), enhanced HBV replication. miR-4453 is a pro-viral host factor, and inhibitors of miR-4453 were found to suppress HBV persistent infection in vitro and in vivo. As a novel therapy for HBV chronic infection and subsequent liver diseases, miR-4453 inhibitor is an appropriate candidate, because the amount of HBsAg, which causes the risk of developing cancer, can be down-regulated by the inhibitor compounds.

Academic Significance and Societal Importance of the Research Achievements

HBV感染は慢性肝炎から肝硬変、肝細胞癌へ進行する。現在の治療薬はインターフェロン又は核酸アナログである。しかし前者は重篤な副作用があり、後者はHBV排除は出来ない為、新しい作用機序の薬物が望まれている。特に発癌リスクが低下する「HBs抗原陰性化」を達成可能な薬物が求められている。
我々はHBVの感染依存に発現が変動するマイクロRNAとしてmiR-4453を同定した。またmiR-4453の阻害剤がHBV複製をin vitro及びin vivoで抑制することも見出した(特許第7441174号)。そして、miR-4453阻害剤はHBs抗原の量を低下させるため、新規抗ウイルス薬になり得る。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2022 2021

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

  • [Journal Article] Infection with the SARS-CoV-2 B.1.351 variant is lethal in aged BALB/c mice.2022

    • Author(s)
      Yasui F, Matsumoto Y, Yamamoto N, Sanada T, Honda T, Munakata T, Itoh Y, Kohara M.
    • Journal Title

      Sci Rep.

      Volume: 12(1) Issue: 1

    • DOI

      10.1038/s41598-022-08104-4

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An attenuated vaccinia vaccine encoding the severe acute respiratory syndrome coronavirus-2 spike protein elicits broad and durable immune responses, and protects cynomolgus macaques and human angiotensin-converting enzyme 2 transgenic mice from severe acute respiratory syndrome coronavirus-2 and its variants.2022

    • Author(s)
      Ishigaki H, Yasui F, Nakayama M, Endo A, Yamamoto N, Yamaji K, Nguyen CT, Kitagawa Y, Sanada T, Honda T, Munakata T, Higa M, Toyama S, Kono R, Takagi A, Matsumoto Y, Koseki A, Hayashi K, Shiohara M, Ishii K, Saeki Y, Itoh Y, Kohara M.
    • Journal Title

      Front Microbiol.

      Volume: 13 Pages: 967019-967019

    • DOI

      10.3389/fmicb.2022.967019

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development and Characterization of a Highly Sensitive NanoLuciferase-Based Immunoprecipitation System for the Detection of Anti-Influenza Virus HA Antibodies.2021

    • Author(s)
      Honda T, Gomi S, Yamane D, Yasui F, Yamamoto T, Munakata T, Itoh Y, Ogasawara K, Sanada T, Yamaji K, Yasutomi Y, Tsukiyama-Kohara K, Kohara M.
    • Journal Title

      mSphere

      Volume: 12 Issue: 3

    • DOI

      10.1128/msphere.01342-20

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Targeted macrocycles hamper hemagglutinin adsorption and fusion, and have antiviral effects in murine and macaque models of influenza.2021

    • Author(s)
      Makoto Saito, Yasushi Itoh, Fumihiko Yasui, Tsubasa Munakata, et al.
    • Journal Title

      Nature Communications, in press

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] CLEC1B is a novel host factor that facilitates hepatitis B virus infection.2022

    • Author(s)
      Tsubasa Munakata and Michinori Kohara
    • Organizer
      The 69th Annual Meeting of the Japanese Society for Virology
    • Related Report
      2022 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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