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Neuroprotective mechanisms mediated by PKC phosphorylation in spinocerebellar degeneration and their application to novel therapies.

Research Project

Project/Area Number 21K06801
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48030:Pharmacology-related
Research InstitutionKobe University

Principal Investigator

Shirafuji Toshihiko  神戸大学, 医学研究科, 特命講師 (30595765)

Co-Investigator(Kenkyū-buntansha) 上山 健彦  神戸大学, バイオシグナル総合研究センター, 教授 (80346254)
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: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsPKC / SCA / 脊髄小脳変性症 / リン酸化 / VCP / PLEKHG4 / 小脳プルキンエ細胞 / リン酸化プロテオーム
Outline of Research at the Start

脊髄小脳変性症(SCA)は小脳プルキンエ細胞変性を起こす疾患である。
SCA1, 2, 14のモデル動物やヒトの小脳においてPKCのリン酸化が亢進し、このことが小脳プルキンエ細胞保護作用を持つことが近年示唆されている。
そこで、このPKCリン酸化の基質を網羅的リン酸化プロテオームを用いて同定し、その下流シグナルを解析する。同定したPKCリン酸化シグナルを標的としたSCAに共通して適用できる治療法開発へつなげる。

Outline of Final Research Achievements

Previous reports suggest that increased PKC activity is a common neuroprotective mechanism in cerebellar Purkinje cells in SCA.
In the present study, we identified VCP and PLEKHG4 as PKC substrates in cerebellar Purkinje cells, with PKC phosphorylation sites at Ser770 and Ser27, Ser677 respectively.
The interaction of PLEKHG4 phosphorylation mutants with RAC1 and CDC42 was analysed and phosphorylation was critical for the interaction, suggesting that PLEKHG4 S27 and S677 phosphorylation exerts cerebellar Purkinje cell protection via RAC1 and CDC42 function. In contrast, no data were obtained on the involvement of VCP S770 phosphorylation in cell death.

Academic Significance and Societal Importance of the Research Achievements

小脳プルキンエ細胞にPLEKHG4, VCPともに発現するので、小脳プルキンエ細胞保護作用のあるPKC活性化の基質が解明された。また、PLEKHG4については、RAC1/CDC42との結合がリン酸化で調整されることが解明された。
これらのことは小脳プルキンエ細胞でのPKCリン酸化シグナルの一端が解明されたことになり、SCAの病態解明、治療法開発に資するものである。

Report

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

    (3 results)

All 2024 2023

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

  • [Journal Article] FAM81A is a postsynaptic protein that regulates the condensation of postsynaptic proteins via liquid?liquid phase separation2024

    • Author(s)
      Kaizuka Takeshi、Hirouchi Taisei、Saneyoshi Takeo、Shirafuji Toshihiko、Collins Mark O.、Grant Seth G. N.、Hayashi Yasunori、Takumi Toru
    • Journal Title

      PLOS Biology

      Volume: 22 Issue: 3 Pages: 3002006-3002006

    • DOI

      10.1371/journal.pbio.3002006

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The blues and rhythm2023

    • Author(s)
      Imamura Kiyomichi、Bota Ayaka、Shirafuji Toshihiko、Takumi Toru
    • Journal Title

      Neuroscience Research

      Volume: S0168-0102(23) Pages: 00199-2

    • DOI

      10.1016/j.neures.2023.11.004

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] PERIOD2 (PER2)のリン酸化スイッチによる気分・概日リズムの制御機構の解明2023

    • Author(s)
      白藤俊彦, 早田敦子, 山脇洋輔, 今村聖路, 竹田浩之, 東山 繁樹, 内匠 透
    • Organizer
      第143回 日本薬理学会近畿部会
    • Related Report
      2023 Annual Research Report

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

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