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pathological mechanism of Takenouchi-Kosaki syndrome

Research Project

Project/Area Number 19K08314
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionOsama Woman's and Children's Hospital

Principal Investigator

Shibukawa Yukinao  地方独立行政法人大阪府立病院機構大阪母子医療センター(研究所), 分子遺伝病研究部門, 主任研究員 (90393264)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsCDC42 / CDC42異常症 / 武内・小崎症候群 / 巨大血小板性血小板減少症 / TKS / 血小板産生 / 希少疾患 / 難病
Outline of Research at the Start

Takenouchi-Kosaki症候群は重度知的障害や巨大血小板性血小板減少症、リンパ浮腫をはじめ屈指症や小頭症、眼瞼下垂など多彩な症状を持つ希少疾患で日本では三例が報告されている。3名の患者は同じ部位に変異を持っておりエフェクターやレギュレーターとの結合領域であるスイッチドメインのチロシンがシステインに置換されている。この変異体が細胞内シグナルにどのような影響を及ぼし前述した主たる症状を発症するのかを巨核球や血小板分化モデルである細胞株や疾患特異的iPS細胞を用いた血小板分化過程でどのステップに障害が生じているのかを細胞レベルで特定し、将来的な治療法や症状の緩和法の開発を目指す。

Outline of Final Research Achievements

Takenouchi-Kosaki syndrome (TKS) exhibits a variety of clinical manifestations, including immunological and hematological anomalies. In the present study, we investigated the functional abnormalities of the TKS mutant in HEK293 cells and elucidated the mechanism of macrothrombocytopenia, one of the symptoms of TKS patients, by monitoring the production of platelet-like particles (PLP) using MEG-01 cells. We found that the TKS mutant was concentrated at the membrane compartment due to impaired binding to Rho-GDI and more active than the wild-type. Y64C mutant-expressing MEG-01 cells demonstrated short cytoplasmic protrusions with aberrant F-actin and microtubules, and reduced PLP production. Furthermore, such dysfunction was ameliorated by either suppression of Cdc42 activity or prenylation using chemical inhibitors. Our study may lead to pharmacological treatments for TKS patients.

Academic Significance and Societal Importance of the Research Achievements

希少疾患であるTKSの原因となるCDC42の異常な活性化メカニズムを明らかにしたことはCDC42の活性化を制御する研究において学術的意義が高いと考えられる。また巨大血小板性血小板減少症に着目した解析ではMEG01細胞を用いて臨床症状を細胞レベルで再現し薬剤のスクリーニング系を確立したこと、さらに低下した血小板産生能を回復させる効果的な薬剤を複数提示したことは将来的な治療や症状の緩和法に繋がると考えられ社会的意義は非常に高いと考えられる。

Report

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

    (8 results)

All 2021 2020 2019 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 3 results) Remarks (1 results)

  • [Journal Article] Macrothrombocytopenia of Takenouchi-Kosaki syndrome is ameliorated by CDC42 specific- and lipidation inhibitors in MEG-01 cells2021

    • Author(s)
      Daimon, E., Shibukawa, Y., Thanasegaran, S., Yamazaki, N., and Okamoto, N.
    • Journal Title

      Scientific reports

      Volume: 11 Issue: 1 Pages: 17990-17990

    • DOI

      10.1038/s41598-021-97478-y

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neuropathophysiological significance of the c.1449T>C/p.(Tyr64Cys) mutation in the CDC42 gene responsible for Takenouchi-Kosaki syndrome2020

    • Author(s)
      Hamada Nanako、Ito Hidenori、Shibukawa Yukinao、Morishita Rika、Iwamoto Ikuko、Okamoto Nobuhiko、Nagata Koh-ichi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 529 Issue: 4 Pages: 1033-1037

    • DOI

      10.1016/j.bbrc.2020.06.104

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] GARRE(Granule Associated Rac And RHOG Effector)遺伝子変異が細胞機能に及ぼす影響2021

    • Author(s)
      渋川幸直、大門江津子、山崎奈津子、岡本伸彦
    • Organizer
      第94回生化学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Takenouchi-Kosaki症候群 (TKS) における血小板減少メカニズムと治療法の探索2021

    • Author(s)
      渋川幸直、大門江津子、山崎奈津子、Suganya Thanasegaran、岡本伸彦
    • Organizer
      第66回日本人類遺伝学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] CDC42異常症の病態解析2019

    • Author(s)
      渋川幸直、大門江津子、山崎奈津子、Suganya Thanasegaran、岡本伸彦
    • Organizer
      生化学会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 大門江津子、渋川幸直、山崎奈津子、Suganya Thanasegaran、岡本伸彦2019

    • Author(s)
      血小板分化モデル細胞MEG-01を用いたCDC42異常症(TKS)の解析 (I)
    • Organizer
      人類遺伝学会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 血小板分化モデル細胞MEG-01を用いたCDC42異常症(TKS)の解析 (II)2019

    • Author(s)
      渋川幸直、大門江津子、山崎奈津子、Suganya Thanasegaran、岡本伸彦、 長崎
    • Organizer
      人類遺伝学会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 大阪母子医療センター研究所

    • URL

      https://www.wch.opho.jp/research/index.html

    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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