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Inka2 regulates actin dynamics in neuronal development

Research Project

Project/Area Number 19K06931
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 46020:Anatomy and histopathology of nervous system-related
Research InstitutionWaseda University

Principal Investigator

Sakakibara Shin-ichi  早稲田大学, 人間科学学術院, 教授 (70337369)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsニューロン / アクチン骨格 / 樹状突起スパイン / Pakファミリー / Inka2 / 細胞骨格 / アクチン / Pak4 / inka2 / アクチンフィラメント / 接着班 / 細胞移動 / PP2A / スパイン / 大脳皮質 / fmr1
Outline of Research at the Start

正常な脳発達においてニューロンの樹状突起スパインの数や形態のコントロールは神経可
塑性の獲得・維持に重要であり,精神発達障害や幾つかの精神疾患ではスパイン密度の変化や異常な形態変化が起きる。inka2遺伝子は脳に強く発現し細胞骨格再編を通してニューロン突起形成を促進する。本研究ではinka2の発現の異常が、遺伝性の精神発達障害・自閉症である脆弱X症候群(FXS)の病態に関係する可能性を検討する。

Outline of Final Research Achievements

Inka2 gene is a novel mammalian protein exhibiting sequence similarity to Inka1, which serves as a possible inhibitor for Pak4. We found that Inka2-iBox directly binds to Pak4 catalytic domain to suppress actin polymerization. Inka2 promoted actin depolymerization and inhibited the formation of cellular protrusion caused by Pak4 activation. We further generated the conditional knockout mice of the Inka2 gene. The beta-galactosidase reporter indicated the preferential Inka2 expression in the dorsal forebrain neurons. Cortical pyramidal neurons of Inka2-/- mice exhibited decreased density and aberrant morphology of dendritic spines with marked activation/phosphorylation of downstream molecules of Pak4 signal cascade, including LIMK and Cofilin. These results uncovered the unexpected function of endogenous Pak4 inhibitor in neurons. Unlike Inka1, Inka2 is a critical mediator for actin reorganization required for dendritic spine development.

Academic Significance and Societal Importance of the Research Achievements

神経細胞の樹状突起スパインの適切な個数や形態は、Pakファミリーシグナルを介するアクチン細胞骨格のダイナミックな重合・脱重合制御により厳しく管理されている。この制御機構の破綻は、統合失調症や自閉スペクトラム症、アルツハイマー病などの種々の精神疾患や発達障害などの機序に深く関係する。しかしその制御機構には未解明な点が多い。本研究によりInka2が、脳内におけるPak4阻害因子であることが明らかとなった。今後Inka2が関与する疾患発症の原因解明やInka2によるPak4阻害をターゲットとする創薬開発へつながることが期待される。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2023 2022 2020 2019 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 1 results) Remarks (2 results)

  • [Journal Article] Inka2 expression in smooth muscle cells and its involvement in cell migration2023

    • Author(s)
      Yamada Seiya、Tokunaga Akinori、Sakakibara Shin-ichi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 643 Pages: 55-60

    • DOI

      10.1016/j.bbrc.2022.12.068

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Identification and expression profile of novel STAND gene Nwd2 in the mouse central nervous system2022

    • Author(s)
      Yamada Seiya、Furukawa Ryutaro、Sakakibara Shin-ichi
    • Journal Title

      Gene Expression Patterns

      Volume: 46 Pages: 119284-119284

    • DOI

      10.1016/j.gep.2022.119284

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inka2, a novel Pak4 inhibitor, regulates actin dynamics in neuronal development2022

    • Author(s)
      Yamada Seiya、Mizukoshi Tomoya、Tokunaga Akinori、Sakakibara Shin-ichi
    • Journal Title

      PLOS Genetics

      Volume: 18 Issue: 10 Pages: 1010438-1010438

    • DOI

      10.1371/journal.pgen.1010438

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nwd1 regulates neuronal differentiation and migration through the purinosome formation in developing cerebral cortex2020

    • Author(s)
      Yamada S, Sato A, Sakakibara S
    • Journal Title

      iScience

      Volume: 23 Issue: 5 Pages: 101058-101058

    • DOI

      10.1016/j.isci.2020.101058

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Control of cell migration by the novel protein phosphatase-2A interacting protein inka22020

    • Author(s)
      Akiyama H, Iwasaki Y, Yamada S, Kamiguchi H, and Sakakibara S.
    • Journal Title

      Cell Tissue Res.

      Volume: 380(3) Issue: 3 Pages: 527-537

    • DOI

      10.1007/s00441-020-03169-x

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Expression and functional analysis of two purine synthetic pathways during neural Development2022

    • Author(s)
      水越智也、 山田晴也、 榊原伸一
    • Organizer
      第46回分子生物学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Inka2, a novel Pak4 inhibitor, regulates actin dynamics in dendritic spinogenesis2022

    • Author(s)
      山田晴也、 水越智也、 徳永暁憲、 榊原伸一
    • Organizer
      第46回分子生物学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] プリン合成系タンパク質群の神経発達過程における発現・機能解析2022

    • Author(s)
      水越智也、山田晴也、榊原伸一
    • Organizer
      第45回日本神経科学大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Drp1のSUMO化によるミトコンドリア形態制御を介した大脳皮質発生機構2022

    • Author(s)
      山田晴也、佐藤彩佳、石原直忠、秋山博紀、榊原伸一
    • Organizer
      第45回日本神経科学大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 発生段階および成体マウス中枢神経系における脱SUMO化酵素SENP5の局在解析2020

    • Author(s)
      佐藤彩佳、山田晴也、秋山博紀、榊原伸一
    • Organizer
      第43回日本分子生物学会年会 (オンライン)
    • Related Report
      2020 Research-status Report
  • [Presentation] Inka2はアクチン骨格再編成を通して樹状突起スパイン形成を制御する2019

    • Author(s)
      山田晴也, 榊原伸一
    • Organizer
      第42回日本分子生物学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] The novel gene Nwd1 regulate cerebral cortex development2019

    • Author(s)
      山田 晴也,秋山 博紀,榊原 伸一
    • Organizer
      第42回日本神経科学大会
    • Related Report
      2019 Research-status Report
  • [Presentation] SUMO de-conjugating enzyme SENP5 regulates neuronal differentiation2019

    • Author(s)
      佐藤彩佳, 山田晴也, 秋山博紀, 榊原伸一
    • Organizer
      第42回日本分子生物学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] The novel geneNwd1 regulate brain development, The 10th IBRO World Congress of Neuroscience2019

    • Author(s)
      Seiya Yamada,,Hiroki Akiyama,and Shin-ichi Sakakibara
    • Organizer
      The 10th IBRO World Congress of Neuroscience
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 神経細胞のアクチン細胞骨格を担う因子を発見

    • URL

      https://www.waseda.jp/top/news/84905

    • Related Report
      2022 Annual Research Report
  • [Remarks] 脳発生に重要な新しい因子発見

    • URL

      https://www.waseda.jp/top/news/77238

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2024-01-30  

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