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The invasion mechanism of MELF pattern in endometrioid carcinoma

Research Project

Project/Area Number 20K16171
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49020:Human pathology-related
Research InstitutionOsaka University

Principal Investigator

Tahara Shinichiro  大阪大学, 大学院医学系研究科, 助教 (20792584)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsMELF / NNMT / PD-L1 / Laser microdissection / RNA sequencing / Crispr/ Cas9 system / MELF pattern / 類内膜癌
Outline of Research at the Start

子宮体部の類内膜癌には、従来の形態学的な分類では悪性度が低く予後が良いとされるGrade 1であるにも関わらず、高い浸潤性を示すMELF (microcystic, elongated, and fragmented) patternを有する腫瘍が存在する。本研究ではMELF patternの病理組織検体における次世代シークエンサーの解析で得た遺伝子発現のデータから、MELF patternの形成に関わる因子を解析し、類内膜癌の新たな浸潤メカニズムを解明することで、類内膜癌の悪性度を示すマーカーや治療のターゲットとなるものを見出すことを目指す。

Outline of Final Research Achievements

We searched for genes preferentially expressed in the invasive front area of endometrioid carcinoma (EC) with the MELF pattern using laser microdissection and RNA sequencing, and showed that nicotinamide N-methyltransferase (NNMT) is related to MELF pattern invasiveness. Immunohistochemical analyses confirmed high NNMT expression in the invasive front area of the MELF pattern, and using EC cell lines, NNMT promoted migration, invasion, colony formation, epithelial-mesenchymal transition (EMT) and chemoresistance. Moreover, we performed immunohistochemical analysis of the distribution of PD-L1 (programmed cell death-ligand 1) expressing cells in G1 with MELF pattern. In cases of G1 with MELF pattern, tumor cells expressed PD-L1 significantly higher in invasive front area than in surface area. Significant therapeutic effect can be expected by applying PD-1/PD-L1 immunotherapy to the treatment of G1 with MELF.

Academic Significance and Societal Importance of the Research Achievements

子宮体部の類内膜癌には形態学的に悪性度が低く予後が良いとされるGrade 1であるにもかかわらず、高い浸潤性を示すMELF (microcystic, elongated, and fragmented) patternという特徴的な形態を有するものがある。MELF patternは組織形態から提唱された概念であるが、その分子メカニズムに関してははっきりしていなかった。本研究ではNNMTがMELFの浸潤メカニズムに関わっていることを示した。またMELF patternを有する類内膜癌にPD-L1阻害薬が有用な治療となる可能性を示した。

Report

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

    (8 results)

All 2022 2021 2020

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (3 results) (of which Invited: 1 results)

  • [Journal Article] Strong expression of PD-L1 in invasive front of MELF pattern in endometrioid carcinoma2022

    • Author(s)
      Tahara S, Kohara M, Sato K, Morii E.
    • Journal Title

      Pathol Res Pract .

      Volume: 229 Pages: 153699-153699

    • DOI

      10.1016/j.prp.2021.153699

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nicotinamide N-methyltransferase is related to MELF pattern invasion in endometrioid carcinoma2021

    • Author(s)
      Tahara S, Nojima S, Ohshima K, Hori Y, Sato K, Kurashige M, Matsui T, Okuzaki D, Morii E.
    • Journal Title

      Cancer Med .

      Volume: 10 Issue: 23 Pages: 8630-8640

    • DOI

      10.1002/cam4.4359

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] An immature inhibin‐α‐expressing subpopulation of ovarian clear cell carcinoma cells is related to an unfavorable prognosis2021

    • Author(s)
      Kusumoto Shinya、Kurashige Masako、Ohshima Kenji、Tahara Shinichiro、Matsui Takahiro、Nojima Satoshi、Hattori Satoshi、Morii Eiichi
    • Journal Title

      Cancer Medicine

      Volume: 10 Issue: 5 Pages: 1485-1500

    • DOI

      10.1002/cam4.3801

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] HTR3A is correlated with unfavorable histology and promotes proliferation through ERK phosphorylation in lung adenocarcinoma2020

    • Author(s)
      Tone Mitsuyo、Tahara Shinichiro、Nojima Satoshi、Motooka Daisuke、Okuzaki Daisuke、Morii Eiichi
    • Journal Title

      Cancer Science

      Volume: 111 Issue: 10 Pages: 3953-3961

    • DOI

      10.1111/cas.14592

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detection of synovial sarcoma with an atypical fusion transcript by using SS18‐SSX and SSX antibodies2020

    • Author(s)
      Tahara Shinichiro、Kohara Masaharu、Honma Keiichiro、Morii Eiichi
    • Journal Title

      Pathology International

      Volume: 70 Issue: 9 Pages: 689-691

    • DOI

      10.1111/pin.12976

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] The molecular mechanism of MELF pattern invasion in endometrioid carcinoma2022

    • Author(s)
      田原紳一郎
    • Organizer
      第111回日本病理学会総会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] NNMTは子宮体部類内膜癌のMELF patternに関連し、浸潤及び抗がん剤耐性を促進する2021

    • Author(s)
      田原紳一郎
    • Organizer
      第110回日本病理学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] HTR3Aは肺腺癌の予後不良な組織型と関連し、増殖を促進する2020

    • Author(s)
      田原紳一郎
    • Organizer
      第109回日本病理学会総会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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