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Construction of a next-generation human prion amplification method and its application to drug screening for human prion diseases

Research Project

Project/Area Number 21K07277
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 51030:Pathophysiologic neuroscience-related
Research InstitutionUniversity of Miyazaki

Principal Investigator

Takatsuki Hanae  宮崎大学, 医学部, 助教 (80773978)

Co-Investigator(Kenkyū-buntansha) 中垣 岳大  長崎大学, 医歯薬学総合研究科(医学系), 准教授 (80722917)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsプリオン病 / 試験管内プリオン増幅法
Outline of Research at the Start

プリオン病は異常型プリオンタンパク質(PrPSc)が中枢神経系に蓄積することで発症する感染性の致死性神経変性疾患です。病原因子であるPrPScは核酸を持たずタンパク質そのものですがウイルス同様に株が存在するという特徴があります。薬剤への感受性がプリオン株によって異なることから、ヒトのプリオン病創薬研究にはヒトプリオンのスクリーニング系の確立が必須ですが、現在スクリーニングに応用できるヒトプリオンのアッセイ系はありません。
本研究では試験管内でPrPScを増幅させる方法(PMCA法)を発展させ、ヒトプリオン増幅系を構築しスクリーニングに応用することを目標としています。

Outline of Final Research Achievements

Two in vitro prion amplification methods were used to screening for prion disease therapeutics. As a result, we found a compound that inhibited the Fukuoka-1 strain. However, this compound was suggested to produce drug-resistant prions by in vitro prion amplification. When the therapeutic effect of this compound on mice infected with the Fukuoka-1 prion strain was examined, survival of the treated mice was not significantly different from that of the non-treated group. On the other hand, survival of mice treated with the compound from 90 days after infection was prolonged. Detecting drug resistance before conducting animal studies is a key to improving the efficiency of therapeutic drug development. In the future, we will examine whether in vitro prion amplification can be a tool to predict the emergence of drug-resistant prions.

Academic Significance and Societal Importance of the Research Achievements

クロイツフェルト・ヤコブ病に代表されるプリオン病は致死性神経変性疾患であり治療法はない。これまでに治療薬として期待された化合物にはプリオン感染細胞で抑制効果が示されたものの、感染マウスにおける耐性プリオンの出現により有効性が制限された事例もある。長期に及ぶ動物試験を行う前に薬剤耐性プリオンの出現を見抜くことは治療薬開発の効率化の鍵となる。本研究で見出された治療薬候補化合物は動物試験において薬剤耐性プリオンが出現したことが示唆され、試験管内プリオン増幅法においても耐性プリオンが出現することが確認された。今後、試験管内プリオン増幅法が薬剤耐性プリオンの出現を予測するツールに成り得るか検討する。

Report

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

    (4 results)

All 2023 2022 2021

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

  • [Journal Article] Pentosan polysulfate induces low-level persistent prion infection keeping measurable seeding activity without PrP-res detection in Fukuoka-1 infected cell cultures2022

    • Author(s)
      Takatsuki H, Imamura M, Mori T, Atarashi R.
    • Journal Title

      Sci Rep.

      Volume: - Issue: 1 Pages: 7923-7923

    • DOI

      10.1038/s41598-022-12049-z

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Investigation of the effect of the emergence of drug-resistant prion in mice2023

    • Author(s)
      Hanae Takatsuki, Morikazu Imamura, Takehiro Nakagaki, Miho Kaneko, Tsuyoshi Mori, Noriyuki Nishida and Ryuichiro Atarashi
    • Organizer
      Asian Pacific Prion Symposium 2023 Tokyo
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 試験管内プリオン増幅法を用いた抗プリオン薬の再評価と薬剤耐性プリオンの分子機構の解明2022

    • Author(s)
      高月英恵
    • Organizer
      第69回日本ウイルス学会
    • Related Report
      2022 Research-status Report
  • [Presentation] Pentosan polysulfate induces latent prion infection in cell cultures infected with Fukuoka-1 strain2021

    • Author(s)
      Takatsuki Hanae
    • Organizer
      APPS 2021 Online
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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