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Analysis of novel molecular mechanism of iNKT cell differentiation based on the discovery of mice deficient in iNKT cells

Research Project

Project/Area Number 19K07624
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49070:Immunology-related
Research InstitutionOsaka University

Principal Investigator

ISHIKAWA Eri  大阪大学, 微生物病研究所, 助教 (20546478)

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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsiNKT細胞分化 / セリンスレオニンキナーゼ / TCRシグナル
Outline of Research at the Start

我々はインバリアントナチュラルキラーT (iNKT)細胞のみが消失するシグナル分子欠損マウスを見出した。また、プロテオミクス解析により、この分子の基質候補分子の1つとして、リンパ球分化に寄与することが知られている転写因子が同定された。この独自の知見に基づき、当該シグナル分子の上流・下流を同定し消失のメカニズムを解明することにより、iNKT細胞分化に至る未解明な分子機構を明らかにする。また、以前我々の研究室で初めて樹立した末梢T細胞特異的Cre発現マウスを用いて当該分子を欠損させたマウスを解析することで、iNKT細胞の分化と末梢での維持・活性化におけるシグナルが異なるか否かを明らかにする。

Outline of Final Research Achievements

We established CD4-Cre-mediated T cell specific PKD-deficient mice and found that iNKT cells were almost absent in the mice. On the basis of this finding, we tried to reveal the novel molecular mechanism of iNKT cell development.
Expression of a transcription factor PLZF, which is necessary for the specification of iNKT cells, was decreased in PKD-deficient cells. Introduction of PLZF transgene in PKD-deficient mice restored the generation of iNKT cells, suggesting that PKD contributes to the induction of PLZF to regulate iNKT cell development. To investigate the molecular link between PKD and PLZF, we searched for PKD substrates by phosphoproteomics and identified a candidate transcription factor. This factor was associated with and phosphorylated by PKD upon TCR stimulation. These results unveiled the novel role of PKD in iNKT development through the regulation of nuclear factors.

Academic Significance and Societal Importance of the Research Achievements

iNKT細胞の分化には転写因子PLZFの発現が必須であることが知られているが、TCRからPLZF発現に至るシグナル経路の詳細は未だ明らかになっていない。また、PKDは細胞質のみでなく核にも局在することが知られているが、核における機能に関しては未だ不明な点が多い。
本研究で得られた成果は、核におけるPKDの重要性を明らかにすると共に、PKDがTCR下流で転写因子のリン酸化を介してPLZFの発現を誘導しiNKT細胞分化を制御するという、iNKT細胞分化の新たな分子機構の存在を強く示唆するものである。

Report

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

    (4 results)

All 2021 2020

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

  • [Journal Article] Protein Kinase D2 drives chylomicron-mediated lipid transport in the intestine and promotes obesity2021

    • Author(s)
      Jonathan Trujillo-Viera, Rabih El-Merahbi, Vanessa Schmidt, Till Karwen, Angel Loza-Valdes, Akim Strohmeyer, Saskia Reuter, Minhee Noh, Magdalena Wit, Izabela Hawro, Sabine Mocek, Christina Fey, Alexander E Mayer, Mona C Loffler, Ilka Wilhelmi, Marco Metzger, Eri Ishikawa, Sho Yamasaki, Monika Rau, Andreas Geier et al.
    • Journal Title

      EMBO Molecular Medicine

      Volume: 13 Issue: 5

    • DOI

      10.15252/emmm.202013548

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Deletion of Protein Kinase D3 Promotes Liver Fibrosis in Mice2020

    • Author(s)
      Zhang Shuya、Liu Huan、Yin Meimei、Pei Xiuying、Hausser Angelika、Ishikawa Eri、Yamasaki Sho、Jin Zheng Gen
    • Journal Title

      Hepatology

      Volume: in press Issue: 5 Pages: 1717-1734

    • DOI

      10.1002/hep.31176

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] セリンスレオニンキナーゼPKDによるiNKT細胞分化制御機構の解析2021

    • Author(s)
      石川絵里、山崎晶
    • Organizer
      第30回Kyoto T Cell Conference
    • Related Report
      2021 Annual Research Report
  • [Presentation] Deciphering molecular link between kinases and transcription factors during iNKT cell development2021

    • Author(s)
      ISHIKAWA Eri, YAMASAKI Sho
    • Organizer
      第50回 日本免疫学会総会・学術集会
    • Related Report
      2021 Annual Research Report

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

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