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遺伝性側頭葉てんかんのシナプス病態、神経回路病態の解明

Publicly Offered Research

Project AreaGeneration of synapse-neurocircuit pathology
Project/Area Number 23110520
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Biological Sciences
Research InstitutionNational Institute for Physiological Sciences

Principal Investigator

深田 優子  生理学研究所, 細胞器官研究系, 准教授 (40416186)

Project Period (FY) 2011-04-01 – 2013-03-31
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2012: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2011: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywordsてんかん / シナプス伝達 / 神経回路 / 神経科学 / リガンド / 受容体 / シナプス
Outline of Annual Research Achievements

“てんかん”は神経細胞および神経回路の異常な興奮によりおこる。しかし、病態解明は進んでおらず、根本的な治療法に至っているものは多くない。申請者はこれまでに、家族性側頭葉てんかんの原因遺伝子産物である分泌蛋白質LGI1が膜蛋白質ADAM22/ADAM23のリガンドとして機能し、AMPA受容体機能を促進することを見出した。また、LGI1機能欠損(KO)マウスでは海馬シナプスのAMPA受容体機能が低下し、致死性てんかんが起こることを見出した。本研究では1)LGI1遺伝子変異とシナプス伝達異常の関連性と、2)てんかん発症における海馬シナプス・神経回路の分子病態を解明することを目的とした。今年度は、当初の研究計画を着実に遂行し、下記のような成果を得た。
1) LGI1遺伝子変異とシナプス伝達異常の関連性解明 家族性側頭葉てんかん家系で報告されている21種類のLGI1ミスセンス変異体を単離し、それらを分泌型、分泌不全型変異体に分類し、分泌型LGI1変異体と分泌不全型LGI1変異体を発現する変異マウス2系統を樹立した。これらのマウスはヒト家族性てんかんのモデルであることを示すと共に、LGI1変異の欠損機能を個体レベルで詳細に明らかにした。またてんかんの新しい治療法を提案した(査読実験中)。
2) てんかん発症における海馬シナプス・神経回路分子病態の解明 脳の神経細胞“種”特異的にLGI1を発現させ、LGI1 KOマウスのてんかんが救済されるか否かによりてんかん発症に関わる神経回路を同定することを試みた。今年度は、LGI1海馬歯状回顆粒細胞、苔状細胞、CA3錐体細胞および抑制性神経特異的にLGI1を発現するマウス系統を作成した。さらにウイルスベクターを用いたLGI1遺伝子補充による方法も開始した。

Research Progress Status

24年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

24年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (19 results)

All 2012 2011 Other

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (11 results) (of which Invited: 2 results) Remarks (2 results)

  • [Journal Article] Leucine-rich glioma inactivated 1 (Lgi1), an epilepsy-related secreted protein, has a nuclear localization signal and localizes both to the cytoplasm and nucleus of the caudal ganglionic eminence neurons.2012

    • Author(s)
      Sayaka Kusuzawa, Takao Honda, Yuko Fukata, Masaki Fukata, Shigeaki Kanatani, Daisuke H. Tanaka, and Kazunori Nakajima
    • Journal Title

      Eur. J. Neurosci.

      Volume: 36 Issue: 3 Pages: 2284-2292

    • DOI

      10.1111/j.1460-9568.2012.08129.x

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phosphatidylinositol 4-kinase IIα is palmitoylated by Golgi-localized palmitoyl transferases in a cholesterol-dependent manner.2012

    • Author(s)
      Lu D et al
    • Journal Title

      J Biol Chem

      Volume: 287 Issue: 26 Pages: 21856-21865

    • DOI

      10.1074/jbc.m112.348094

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] LGI2 Truncation Causes a Remitting Focal Epilepsy in Dogs2011

    • Author(s)
      Seppala EH, et al
    • Journal Title

      PLoS Genetics

      Volume: 7

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Subcellular Golgi localization of Stathmin family proteins is promoted by a specific set of DHHC palmitoyl transferases2011

    • Author(s)
      Levy, et al
    • Journal Title

      Mol Biol Cell

      Volume: 22 Pages: 1930-1942

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] DHHC proteins

    • Author(s)
      Oku S, et al
    • Journal Title

      Encyclopedia of Signaling Molecules, Springer

      Volume: 1st Edition(in press)

    • Related Report
      2011 Annual Research Report
  • [Journal Article] Synaptic plasticity regulated by protein-protein interactions and posttranslational modifications

    • Author(s)
      Yokoi N, et al
    • Journal Title

      International Review of Cell & Molecular Biology

      Volume: (in press)

    • Related Report
      2011 Annual Research Report
  • [Presentation] Molecular pathogenesis of epilepsy by LGI1 dysfunction2012

    • Author(s)
      Fukata Y
    • Organizer
      The international NIPS symposium “Understanding of synapse pathology, from genome mutation to functional defects”
    • Place of Presentation
      愛知県岡崎市 自然科学研究機構岡崎カンファレンスセンター
    • Year and Date
      2012-11-08
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Molecular mechanisms for the human epilepsy caused by LGI1 mutations2012

    • Author(s)
      Yokoi N, Fukata M, and Fukata Y
    • Organizer
      第35回日本神経科学大会
    • Place of Presentation
      愛知県名古屋市 名古屋国際会議場
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] Modes of action of anti-LGI1 autoantibodies in limbic encephalitis2012

    • Author(s)
      Ohkawa T, Fukata Y, Watanabe O, Yokoi N, and Fukata M
    • Organizer
      第35回日本神経科学大会
    • Place of Presentation
      愛知県名古屋市 名古屋国際会議場
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] Identification of palmitoyl substrate-enzyme pairs in neurons through in silico genome-wide screening2012

    • Author(s)
      Oku S, Takahashi N, Fukata Y, and Fukata M
    • Organizer
      第35回日本神経科学大会
    • Place of Presentation
      愛知県名古屋市 名古屋国際会議場
    • Year and Date
      2012-09-18
    • Related Report
      2012 Annual Research Report
  • [Presentation] New players in synapse regulation:Epilepsy-related ligand/receptor, LGI1 and ADAM22.2012

    • Author(s)
      Fukata Y
    • Organizer
      Functional Connectomics Seminar Series
    • Place of Presentation
      Center for Functional Connectomis, Seoul, Korea
    • Year and Date
      2012-04-25
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Molecular dissection of epilepsy-related neuronal secreted protein, LGI12011

    • Author(s)
      深田優子, ら
    • Organizer
      51st Annual Meeting The American Society for Cell Biology
    • Place of Presentation
      Denver, CO, USA
    • Year and Date
      2011-12-04
    • Related Report
      2011 Annual Research Report
  • [Presentation] Local palmitoyltransferase activity induces nucleation of postsynaptic protein assembly2011

    • Author(s)
      深田正紀, ら
    • Organizer
      51st Annual Meeting The American Society for Cell Biology
    • Place of Presentation
      Denver, CO, USA
    • Year and Date
      2011-12-03
    • Related Report
      2011 Annual Research Report
  • [Presentation] Molecular and Cellular characterization of epilepsy-related LGI1 mutations2011

    • Author(s)
      横井紀彦, ら
    • Organizer
      41st Annual Meeting Neuroscience 2010 SFN
    • Place of Presentation
      Washington DC, USA
    • Year and Date
      2011-11-16
    • Related Report
      2011 Annual Research Report
  • [Presentation] ヒト側頭葉てんかん関連蛋白質LGI1の機能解析2011

    • Author(s)
      深田正紀, ら
    • Organizer
      第23回日本神経免疫学会学術集会
    • Place of Presentation
      京王プラザホテル(東京)
    • Year and Date
      2011-11-13
    • Related Report
      2011 Annual Research Report
  • [Presentation] Visualization of endogenous palmitoylated PSD-95 reveals local palmitoyltransferase-induced nucleation of postsynaptic assembly2011

    • Author(s)
      深田優子, ら
    • Organizer
      41st Annual Meeting Neuroscience 2010 SFN
    • Place of Presentation
      Washington DC, USA
    • Year and Date
      2011-11-13
    • Related Report
      2011 Annual Research Report
  • [Presentation] Systematic identification of autoantigens for immune-mediated neurological disorders2011

    • Author(s)
      深田正紀, ら
    • Organizer
      41st Annual Meeting Neuroscience 2010 SFN
    • Place of Presentation
      Washington DC, USA
    • Year and Date
      2011-11-13
    • Related Report
      2011 Annual Research Report
  • [Remarks] 生理学研究所 生体膜研究部門

    • URL

      http://www.nips.ac.jp/fukata/

    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://www.nips.ac.jp/fukata/

    • Related Report
      2011 Annual Research Report

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Published: 2011-04-06   Modified: 2018-03-28  

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