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Epigenetic diagnosis and therapy for thymic carcinoma

Research Project

Project/Area Number 20K09178
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55040:Respiratory surgery-related
Research InstitutionThe University of Tokushima

Principal Investigator

KONDO Kazuya  徳島大学, 大学院医歯薬学研究部(医学域), 教授 (10263815)

Co-Investigator(Kenkyū-buntansha) 吉田 光輝  徳島大学, 病院, 講師 (30403710)
宮本 直輝  徳島大学, 病院, 助教 (00865305)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords胸腺癌 / DNAメチル化 / 網羅的解析 / CpGサイト / 癌抑制遺伝子 / DNAメチル化 / CpGサイト
Outline of Research at the Start

胸腺癌はgeneticな異常が高頻度であると報告されたが、epigeneticな異常の研究は少ない。47万のCpG siteのDNAメチル化を網羅的に検索し、胸腺癌で高頻度にDNAメチル化した93個のCpG islandを抽出し、癌関連遺伝子と予想される7個をピックアップした。胸腺癌と胸腺腫で、pyrosequence法にて、DNAメチル化を検討する。RT-PCR にてmRNAの発現を、免疫染色で蛋白発現を検討する。胸腺癌の悪性度と関連する癌抑制遺伝子を検索し、新たな診断・治療の標的分子とする。胸腺癌のDNAメチル化が多く、epigenetic治療の標的となるか、を検討する。

Outline of Final Research Achievements

We performed genome wide screening of methylated CpG islands in thymoma and thymic carcinoma. We identified 92 CpG islands significantly hypermethylated in thymic carcinoma in relation to thymoma and selected GNG4, GHSR, HOXD9, SALL3, GAD1, NPTX2 and MT1 which are related to cancer. We examined the methylation, mRNA and protein expression. Methylation was significantly higher in thymic carcinoma than in thymoma and revealed a high discrimination between thymic carcinoma and thymoma in all 7 genes. Among the 7 genes, relapse free survival was significantly worse in tumors with a higher DNA methylation than in those with a lower DNA methylation.
In GAD1, mRNA and protein expression were significantly higher in thymic carcinoma than in thymomas. Tumors with high GAD1 DNA methylation and high mRNA and protein expression had significantly shorter relapse free survival rates than those with low levels. It acts as oncogenic function.

Academic Significance and Societal Importance of the Research Achievements

胸腺癌は、難治性であり、治療薬も限定されている。新薬を発見するため、新しいアプローチが必要である。私たちの研究は、網羅的にDNAメチル化を解析し、胸腺癌が“ エピジェネティック(遺伝子変化を伴わない遺伝子発現の変化)な異常を多く有する腫瘍”であることを示した。特に、GAD1遺伝子は、DNAのメチル化頻度と蛋白発現が相関し、腫瘍の悪性度と関連する。治療の候補分子となることが推測された。

Report

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

    (5 results)

All 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (3 results)

  • [Journal Article] GAD1 expression and its methylation as indicators of malignant behavior in thymic epithelial tumors2021

    • Author(s)
      Soejima Shiho、Kondo Kazuya、Tsuboi Mitsuhiro、Muguruma Kyoka、Tegshee Bilguun、Kawakami Yukikiyo、Kajiura Koichiro、Kawakita Naoya、Toba Hiroaki、Yoshida Mitsuteru、Takizawa Hiromitsu、Tangoku Akira
    • Journal Title

      Oncology Letters

      Volume: 21 Issue: 6 Pages: 483-494

    • DOI

      10.3892/ol.2021.12744

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] GHSR methylation-dependent expression of a variant ligand and receptor of the ghrelin system induces thymoma tumorigenesis2021

    • Author(s)
      Tegshee Bilguun、Kondo Kazuya、Soejima Shiho、Muguruma Kyoka、Tsuboi Mitsuhiro、Kajiura Koichiro、Kawakami Yukikiyo、Kawakita Naoya、Toba Hiroaki、Yoshida Mitsuteru、Takizawa Hiromitsu、Tangoku Akira
    • Journal Title

      Oncology Letters

      Volume: 22 Issue: 5 Pages: 793-803

    • DOI

      10.3892/ol.2021.13054

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 胸腺上皮性腫瘍におけるMT1A遺伝子のDNAメチル化とmRNA発現2021

    • Author(s)
      六車京香,近藤和也,副島志帆,Bilguun tegshee,山下理子,岸渕麗奈,坪井光弘,梶浦耕一郎,川上行奎,河北直也,鳥羽博明,吉田光輝,滝沢宏光,丹黒 章
    • Organizer
      第40回日本胸腺研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] 胸腺上皮性腫瘍の悪性度とGAD1遺伝子のDNAメチル化と発現2020

    • Author(s)
      副島志帆,近藤和也,坪井光弘,梶浦耕一郎,六車京香,川上行奎,河北直也,鳥羽博明,吉田光輝,滝沢宏光,丹黒 章
    • Organizer
      第61回日本肺癌学会学術集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Expression of variant ligand and receptor of Ghrelin system is related to tumorigenesis of thymoma2020

    • Author(s)
      Bilguun Tegshee, Kazuya Kondo, Shiho Soejima, Kyoka Muguruma, Mitsuhiro Tsuboi, Koichiro Kajiura,Yukikiyo Kawakami, Naoya Kawakita, Toru Sawada, Hiroaki Toba, Mitsuteru Yoshida, Hiromitsu Takizawa, Akira Tangoku
    • Organizer
      第61回日本肺癌学会学術集会
    • Related Report
      2020 Research-status Report

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

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