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Revelation of the distribution of scrapie prion protein of non-central nervous tissues in prion diseases

Research Project

Project/Area Number 20K16183
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49020:Human pathology-related
Research InstitutionAichi Medical University

Principal Investigator

Akagi Akio  愛知医科大学, 加齢医科学研究所, 講師 (10804239)

Project Period (FY) 2020-04-01 – 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: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsプリオン病 / プリオン仮説 / 非中枢性組織 / 非中枢神経組織 / 三叉神経 / 電子顕微鏡 / プリオン蛋白質 / 末梢神経
Outline of Research at the Start

プリオン病は致死性の中枢神経疾患である。異常プリオン蛋白(PrP)が体内に侵入すると、中枢神経内の正常PrPが次々と異常PrPに変換される。そして中枢神経が広汎に障害されて死に至る。しかしプリオン病で異常PrPの伝播がどこまでどのように広がっていくのかは、未だ解明されていない。
プリオン病では発症早期にすでに大脳皮質全体にびまん性に異常PrPの沈着が見られるため、異常PrPの伝播の解明のためには非中枢神経組織に着目する必要があると考えた。本研究では、非中枢神経組織の異常PrPの有無と局在に着目し、ヒトの異常PrPの新しい伝播様式を解明を目指す。

Outline of Final Research Achievements

In prion diseases, scrapie prion protein (PrPSc) is deposited diffusely throughout the cerebral cortex from an early onset. This study examined the localization of PrPSc in the trigeminal ganglia of non-central nervous tissues to elucidate the route and propagation mode of PrPSc. Eighteen cases of prion diseases were analyzed. Vacuole formation was observed within the neuronal body of the trigeminal ganglion; however, no PrPSc deposition was observed. Conversely, PrPSc deposition was observed in the nerve fibers of the trigeminal ganglion. The study results suggest that PrPSc in the body propagates through the trigeminal nerve fibers and spreads to non-central nervous tissues. We will continue to perform autopsies and analyses of prion diseases, including non-central nervous tissues, to elucidate the route and propagation mode of PrPSc.

Academic Significance and Societal Importance of the Research Achievements

異常プリオン蛋白(PrP)が体内に侵入すると、正常PrPが構造変化を起こし異常PrPに変換される (感染性を有するようになる) 。このように蛋白のみで疾患が伝播されることをプリオン仮説と呼ぶ。近年、アルツハイマー病やパーキンソン病でもプリオン仮説が起こり、異常蛋白の分布や広がりが臨床症状と密接に関連し、特定の決まったパターンで空間的に進展することが報告されている。
本研究で、三叉神経線維に沿った異常PrPの沈着を認めた。異常PrPは中枢組織から神経線維を通じて、非中枢神経組織へ拡がっている可能性が示唆される。異常PrPの体内での伝播経路を考える上で貴重な所見を得た。

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

    (9 results)

All 2023 2022 2021 2020

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Detection of Prions in a Cadaver for Anatomical Practice2022

    • Author(s)
      Nakagaki Takehiro、Kaneko Miho、Satoh Katsuya、Murai Kiyohito、Saiki Kazunobu、Matsumoto Gen、Ogami-Takamura Keiko、Ikematsu Kazuya、Akagi Akio、Iwasaki Yasushi、Tsurumoto Toshiyuki、Nishida Noriyuki
    • Journal Title

      New England Journal of Medicine

      Volume: 386 Issue: 23 Pages: 2245-2246

    • DOI

      10.1056/nejmc2204116

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] An autopsy case of MV2K-type sporadic Creutzfeldt-Jakob disease presenting with characteristic clinical, radiological, and neuropathological findings2022

    • Author(s)
      Matsuo K, Goto D, Hasegawa M, Ogita K, Koyama T, Akagi A, Kitamoto T, Yoshida M, Iwasaki Y.
    • Journal Title

      Neuropathology

      Volume: 42(3) Issue: 3 Pages: 245-253

    • DOI

      10.1111/neup.12804

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Formalin RT-QuIC assay detects prion-seeding activity in formalin-fixed brain samples from sporadic Creutzfeldt?Jakob disease patients2021

    • Author(s)
      Dong Thi-Thu-Trang、Akagi Akio、Nonaka Toshiaki、Nakagaki Takehiro、Mihara Ban、Takao Masaki、Iwasaki Yasushi、Nishida Noriyuki、Satoh Katsuya
    • Journal Title

      Neurobiology of Disease

      Volume: 159 Pages: 105504-105504

    • DOI

      10.1016/j.nbd.2021.105504

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Identification of intracerebral hemorrhage in the early-phase of MM1+2C-type sporadic Creutzfeldt-Jakob disease: A case report2020

    • Author(s)
      Akagi A, Iwasaki Y, Yamamoto A, Matsuura H, Ikeda T, Mimuro M, Riku Y, Miyahara H, Kitamoto T, Yoshida M.
    • Journal Title

      Neuropathology

      Volume: 40(4) Issue: 4 Pages: 399-406

    • DOI

      10.1111/neup.12658

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Reconsidering the pathological classification of sporadic Creutzfeldt-Jakob disease2023

    • Author(s)
      Akio Akagi, Mari Yoshida, Yasushi Iwasaki
    • Organizer
      Asian Pacific Prion Symposium 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A patient with sporadic Creutzfeldt-Jakob disease and repeated intracranial hemorrhage2021

    • Author(s)
      Akio Akagi, Rina Hashimoto, Ikuko Aiba, Akira Inukai, Toshimasa Ikeda, Yuichi Riku, Hiroaki Miyahara, Mari Yoshida, Yasushi Iwasaki
    • Organizer
      62nd Annual Meeting of the Japanese Society of Neurology
    • Related Report
      2021 Research-status Report
  • [Presentation] ヒトプリオン病における異常プリオン蛋白質の 非中枢神経組織への広がりの解明2021

    • Author(s)
      赤木明生、陸雄一、宮原弘明、吉田眞理、岩崎靖
    • Organizer
      第62回日本神経病理学会総会学術研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] An autopsy case of a patient with sporadic Creutzfeldt-Jakob disease and repeated intracranial hemorrhage2020

    • Author(s)
      Akio Akagi, Rina Hashimoto, Ikuko Aiba, Akira Inukai, Toshimasa Ikeda, Maya Mimuro, Yuichi Riku, Hiroaki Miyahara, Tetsuyuki Kitamoto, Mari Yoshida, Yasushi Iwasaki
    • Organizer
      第61回日本神経病理学会総会学術研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] 全経過約1ヶ月の 孤発性Creutzfeldt-Jakob病の1剖検例2020

    • Author(s)
      赤木明生、伊藤翔太、林佳絵、陸雄一、三室マヤ、吉田眞理、岩崎靖
    • Organizer
      第61回日本神経病理学会総会学術研究会
    • Related Report
      2020 Research-status Report

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

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