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Study on the molecular mechanism of neuropathogenicity of a subacute sclerosing panencephalitis (SSPE) virus

Research Project

Project/Area Number 19K08941
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54030:Infectious disease medicine-related
Research InstitutionNagahama Institute of Bio-Science and Technology

Principal Investigator

ITOH Masae  長浜バイオ大学, バイオサイエンス学部, 教授 (10201328)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
KeywordsSSPEウイルス / 神経病原性 / 持続感染 / 麻疹ウイルス / 亜急性硬化性全脳炎 / 潜伏感染
Outline of Research at the Start

亜急性硬化性全脳炎(subacute sclerosing panencephalitis、SSPE)ウイルスはゲノムのあらゆる遺伝子に多数の変異を持つが、それらは多段階変異の痕跡と理解することができる。そこで申請者は、そのゲノム上に残された変異を分子ウイルス学的に解剖することにより網羅的に解析し、変異過程をあらためて構築するという新しい発想に基づき、SSPEの病原性発現機構に迫ることを計画した。本研究の目的は、SSPEウイルスKobe-1株ゲノム上の変異を導入した様々な組換え麻疹ウイルスを人工的に作製して変異途上にあると考えられるウイルスのライブラリーを創出し、麻疹ウイルスからSSPEウイルスへと至る過程を再現実証することである。

Outline of Final Research Achievements

Characterization of the all mutations detected in the genome of the Kobe-1 strain of subacute sclerosing panencephalitis (SSPE) virus was performed with the aim to unravel the whole aspect of the molecular mechanism through which a parental measles virus evolved into an SSPE virus in the brain of a patient taking several years. In the P, F, H and L proteins, amino acid mutations that suppress the function of each viral protein were identified; recombinant viruses bearing those mutations decreased their propagation in neuronal cells. At the stage of disease onset, the Kobe-1 strain should have increased its cell-to-cell fusion ability obtaining mutations in the F and M proteins, which accelerated viral spread in the brain. Mutations that cause the opposite effect on the virus to reduce its growth might have been indispensable for the measles virus to establish persistent infection just after invasion into the brain before acquiring enhanced cell-to-cell fusion ability.

Academic Significance and Societal Importance of the Research Achievements

SSPEは、麻疹治癒後も麻疹ウイルスが脳内に持続感染し、5から10年を経て稀に発症する致死的疾患である。発症前の変異途上のウイルスを得ることはできず、本研究において、発症後に分離されたウイルスのゲノム上の全変異を解析することにより、初めて持続感染の分子機構を推察するに至った。今後、他のSSPEウイルス株において同様の解析を積み重ね、病原性発現機構の全体像が明らかとなれば、未だ科学的根拠が不明なワクチン株がSSPEを発症しない理由の解明へと展開でき、同時に、治療法や治療薬開発の可能性につながるものと期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results)

  • [Journal Article] M protein of subacute sclerosing panencephalitis virus, synergistically with the F protein, plays a crucial role in viral neuropathogenicity2021

    • Author(s)
      Satoh Yuto、Higuchi Kurara、Nishikawa Daichi、Wakimoto Hiroshi、Konami Miho、Sakamoto Kento、Kitagawa Yoshinori、Gotoh Bin、Jiang Da-Peng、Hotta Hak、Itoh Masae
    • Journal Title

      Journal of General Virology

      Volume: 102 Issue: 10 Pages: 001682-001682

    • DOI

      10.1099/jgv.0.001682

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Respirovirus C protein inhibits activation of type I interferon receptor‐associated kinases to block JAK‐STAT signaling2019

    • Author(s)
      Kitagawa Yoshinori、Yamaguchi Mayu、Kohno Miki、Sakai Madoka、Itoh Masae、Gotoh Bin
    • Journal Title

      FEBS Letters

      Volume: 594 Issue: 5 Pages: 864-877

    • DOI

      10.1002/1873-3468.13670

    • NAID

      120006776241

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 亜急性硬化性全脳炎(SSPE)発症過程における 麻疹ウイルスLタンパク質の役割2021

    • Author(s)
      坂本 賢人、小浪 海峰、樋口 遥、姜 大鵬、脇本 浩史、亀田 森羅、佐藤 友人、北川 善紀、後藤 敏、高橋 健一、堀田 博、伊藤 正恵
    • Organizer
      第68回日本ウイルス学会学術集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] MERSコロナウイルスORF4b蛋白質によるI型IFN応答経路の阻害2021

    • Author(s)
      北川善紀、野中 梨聖、髙澤 博人、伊藤 正恵、後藤 敏
    • Organizer
      第68回日本ウイルス学会学術集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Characterization of the mutations in the L protein of the Kobe-1 strain of a subacute sclerosing panencephalitis (SSPE) virus.2019

    • Author(s)
      Satoh Y, Konami M, Wakimoto H, Higuchi K, Jiang D-P, Sakamoto K, Kitagawa Y, Gotoh B, Takahashi K, Hotta H, Itoh M.
    • Organizer
      The 67th Annual Meeting of the Japanese Society for Virology.
    • Related Report
      2019 Research-status Report
  • [Presentation] Middle East respiratory syndrome coronavirus ORF4b inhibits IKKα-mediated phosphorylation of IRF7 involved in activation of the alpha interferon gene.2019

    • Author(s)
      Kitagawa Y, Itoh M, Gotoh B.
    • Organizer
      The 67th Annual Meeting of the Japanese Society for Virology.
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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