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Recognition of non-canonical MHC-I by epithleial cells and elimination of transformed cells

Research Project

Project/Area Number 21K07107
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionWaseda University

Principal Investigator

Kamoshita Nagisa  早稲田大学, 理工学術院, 研究助手 (30835814)

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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords発がん制御 / 超早期がん / 細胞死 / 形質膜リガンド / 細胞競合 / がん変異細胞 / MHC-I / 抗原提示認識 / 正常-変異細胞間シグナル
Outline of Research at the Start

上皮細胞は非免疫細胞であるにも関わらず、隣接するがん変異細胞の古典的MHC-Iaを認識し、がん変異細胞を排除する。すなわち、上皮細胞には免疫細胞様の機能があることが分かってきた。受容体として機能未知のAltR(suboptimal Alteration Recognizing proteinと命名)が、がん変異細胞のMHC-Iaを認識し、骨格形成因子の集積を促進することで、排除能を惹起する。一方で、このシグナルに対する抑制機構は分かっていない。最近申請者は、非古典的MHC-Ibが排除に対して抑制的に働くという知見を得ている。本研究では、非古典的MHC-Ibによる変異細胞排除の抑制機構の解明を目指す。

Outline of Final Research Achievements

It has been found that stimulated MHC-Ib expressed on epithelial cells induces cell death through the reverse signaling. Identification of candidate ligand molecules for MHC-Ib, which is essential for elucidating the reverse signaling mechanism, and analysis of the cell death induction mechanism via MHC-Ib were conducted. The minimal peptide of the identified ligand binding with MHC-I induced cell death in vitro. Additionally, MHC-Ib stimulated by the minimal peptide activated the MAPK pathway. This revealed that the induced cell death is through Apoptosis mediated by Caspase3 activation. Furthermore, application of the peptide in mouse in vivo experiments resulted in suppression of carcinogenesis.

Academic Significance and Societal Importance of the Research Achievements

本研究では、がん変異細胞の排除を抑制する機構を解明した。このMHC-Ibによる抑制機構を解除することで、MHC-Ia/AltRによる変異細胞の排除シグナルをより効率的に促進でき、予防するための治療法確立に繋がる。本研究で解明される抑制機構を解除することは、まさにこのがん変異細胞の排除を促進するために有効な手段である。そのため、予防的にがん変異細胞を排除する医療の確立に大きく貢献する。

Report

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

    (7 results)

All 2024 2022 2021

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

  • [Journal Article] Epithelial recognition and elimination against aberrant cells2024

    • Author(s)
      Ayukawa Shiyu、Kamoshita Nagisa、Maruyama Takeshi
    • Journal Title

      Seminars in Immunopathology

      Volume: Online ahead of print. Issue: 4-6 Pages: 521-532

    • DOI

      10.1007/s00281-024-01001-0

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epithelial cells remove precancerous cells by cell competition via MHC class I?LILRB3 interaction2021

    • Author(s)
      Ayukawa Shiyu、Kamoshita Nagisa、Nakayama Jun、Teramoto Ryohei、Pishesha Novalia、Ohba Kenji、Sato Nanami、Kozawa Kei、Abe Hikari、Semba Kentaro、Goda Nobuhito、Fujita Yasuyuki、Maruyama Takeshi
    • Journal Title

      Nature Immunology

      Volume: 22 Issue: 11 Pages: 1391-1402

    • DOI

      10.1038/s41590-021-01045-6

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] AltR on epithelial cells recognizes MHC-I to eliminate precancerous cells.2022

    • Author(s)
      鮎川志優, 鴨下渚, 丸山剛
    • Organizer
      第51回日本免疫学会学術総会
    • Related Report
      2022 Research-status Report
  • [Presentation] 上皮細胞はAltR-MHC-Iの相互作用を介して前がん細胞を押し出し排除する2022

    • Author(s)
      鮎川志優, 鴨下渚, 丸山剛
    • Organizer
      第95回 日本生化学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Epithelial cells remove precancerous cells by cell competition via MHC class I-AltR interaction2022

    • Author(s)
      鮎川志優, 鴨下渚, 丸山剛
    • Organizer
      第81回 日本癌学会学術総会
    • Related Report
      2022 Research-status Report
  • [Presentation] Epithelial Cells Remove Precancerous Cells by Cell Competition via MHC class I-AltR Interaction2022

    • Author(s)
      鮎川志優, 鴨下渚, 丸山剛
    • Organizer
      7th JCA-AACR Special Joint Conference “The Latest Advances in Pancreatic Cancer Research: From Basic Science to Therapeutics”
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 上皮細胞はMHC-I-LILRB3の相互作用を介した細胞競合によりがん変異細胞を排除する2022

    • Author(s)
      鮎川志優, 鴨下渚, 丸山剛
    • Organizer
      2022年度日本生化学会関東支部例会
    • Related Report
      2022 Research-status Report

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

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