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Loss of hippocampal synapses in FTLD: autopsy-based study

Research Project

Project/Area Number 20K16586
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52020:Neurology-related
Research InstitutionAichi Medical University

Principal Investigator

Riku Yuichi  愛知医科大学, 付置研究所, 助教 (50748382)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords前頭側頭型認知症 / TDP-43 / tau / シナプス / 筋萎縮性側索硬化症 / 剖検
Outline of Research at the Start

病理学的に、前頭側頭型認知症患者の神経・グリア細胞内にはTDP-43もしくはtauの凝集体が形成される。皮質における凝集体形成はタンパク毒性による神経細胞脱落を起こし、認知機能障害につながるとされている。しかし、前頭側頭型認知症の海馬顆粒細胞では、TDP-43あるいはtauの高度の凝集がみられるにもかかわらず、ほとんど細胞脱落が起こらない。今回我々は、細胞死・細胞脱落とは異なった細胞障害の機序として、シナプスの障害が早期に起きるという仮説を立て、前頭側頭型認知症の患者剖検脳を用いて病理学的検討を行う。

Outline of Final Research Achievements

TDP-43 and tau aggregates are pathologic hallmarks of frontotemporal lobar degeneration (FTLD). It is known that aggregates demonstrate neurotoxicity and facilitate neuronal death. However, we hypothesized synaptic loss to be an earlier phenomenon than neuronal loss. We included consecutively autopsied cases with FTLD, in which postmortem diagnosis of FTLD-TDP or FTLD-tau were confirmed. In results, FTLD-TDP and FTLD-tau cases showed severe loss of axon terminals that were efferent from hippocampal granule cells. Importantly, in FTLD-TDP cases, axon terminal loss of hippocampal granule cells preceded to neuronal loss. By contrast, in the FTLD-tau cases, axon terminal loss was positively correlated with that of neuronal loss for the hippocampal granule cells. The results indicate that axon terminal loss of the hippocampal granule cells precedes to neuronal loss in FTLD-TDP cases, whereas that arises as a consequence of neuronal loss in FTLD-tau cases.

Academic Significance and Societal Importance of the Research Achievements

この研究により、前頭側頭型認知症の早期病変として海馬顆粒細胞の軸索終末が提起された。特にTDP-43に関連した前頭側頭型認知症においては、神経細胞の脱落が起こる前からこの変化が起こることが示唆された。早期治療の標的として、海馬顆粒細胞のシナプス伝達が重要となってゆくと考えられる。このシナプスはグルタミン酸作動性であり、アルツハイマー病で行われているようなコリン作動性シナプスの補充療法とは異なった創薬が必要になり、かつ効果が期待される。

Report

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

    (7 results)

All 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 (3 results) (of which Invited: 1 results)

  • [Journal Article] Motor neuron TDP-43 proteinopathy in progressive supranuclear palsy and corticobasal degeneration2022

    • Author(s)
      Riku Yuichi、Iwasaki Yasushi、Ishigaki Shinsuke、Akagi Akio、Hasegawa Masato、Nishioka Kenya、Li Yuanzhe、Riku Miho、Ikeuchi Takeshi、Fujioka Yusuke、Miyahara Hiroaki、Sone Jun、Hattori Nobutaka、Yoshida Mari、Katsuno Masahisa、Sobue Gen
    • Journal Title

      Brain

      Volume: - Issue: 8 Pages: 2769-2784

    • DOI

      10.1093/brain/awac091

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multiple system atrophy variant with severe hippocampal pathology2021

    • Author(s)
      Ando Takashi、Riku Yuichi、Akagi Akio、et al.
    • Journal Title

      Brain Pathology

      Volume: 32 Issue: 1

    • DOI

      10.1111/bpa.13002

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pathway from TDP-43-Related Pathology to Neuronal Dysfunction in Amyotrophic Lateral Sclerosis and Frontotemporal Lobar Degeneration2021

    • Author(s)
      Riku Yuichi、Seilhean Danielle、Duyckaerts Charles、Boluda Susana、Iguchi Yohei、Ishigaki Shinsuke、Iwasaki Yasushi、Yoshida Mari、Sobue Gen、Katsuno Masahisa
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 8 Pages: 3843-3843

    • DOI

      10.3390/ijms22083843

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Reappraisal of the anatomical spreading and propagation hypothesis about TDP-43 aggregation in amyotrophic lateral sclerosis and frontotemporal lobar degeneration2020

    • Author(s)
      Yuichi Riku
    • Journal Title

      Neuropathology

      Volume: 40 Issue: 5 Pages: 426-435

    • DOI

      10.1111/neup.12644

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] TDP-43 pathology of spinal cord in tau-related neurodegenerati ve disorders2021

    • Author(s)
      陸 雄一
    • Organizer
      日本神経学会 第62回学術総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] TDP-43 pathology of spinal cord in tau-related neurodegenerative disorders2021

    • Author(s)
      Yuichi Riku
    • Organizer
      日本神経学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Reappraisal of the TDP-43 propagation hypothesis in amyotrophic lateral sclerosis and frontotemporal lobar degeneration2020

    • Author(s)
      Yuichi Riku
    • Organizer
      日本神経病理学会
    • Related Report
      2020 Research-status Report
    • Invited

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Published: 2020-04-28   Modified: 2023-01-30  

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