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2008 Fiscal Year Annual Research Report

炎症を基盤とした未分化型胃癌のエピジェネティクス解析と発癌リスク予測

Research Project

Project/Area Number 20390210
Research InstitutionSapporo Medical University

Principal Investigator

篠村 恭久  Sapporo Medical University, 医学部, 教授 (90162619)

Co-Investigator(Kenkyū-buntansha) 山本 博幸  札幌医科大学, 医学部, 講師 (40332910)
鈴木 拓  札幌医科大学, 医学部, 助教 (20381254)
Keywords遺伝子診断 / 遺伝子変異 / メチル化 / 前癌病変 / H. pylori
Research Abstract

本研究では、慢性胃炎におけるゲノムワイドなメチル化レベルを解析し、DNAメチル化の発癌リスク予測の分子マーカーとしての有用性について検討することを目的とする。これまで、LINE-1メチル化レベルはHP非感染(HP-)、HP感染・皺壁肥大陰性(HP+/EF-)、HP感染・皺襞肥大(HP+/EF+)で低下すること、CDH1、CDH13、PGP9.5メチル化レベルはHP-と比べHP+/EF-で上昇すること、HP+/EF-とHP+/EF+ではCDH1のみが上昇することを報告してきた。本年度は、胃癌におけるLINE-1のメチル化レベルを解析し、遺伝子変異との関連を解析した。胃癌におけるLINE1メチル化は平均53%で慢性胃炎に比べ低下し(P<0.01)、LINE-1低メチル化を認める症例でp53変異を高率に認めた(P<0.01)。また、前庭部胃炎と体部胃炎におけるDNAメチル化を網羅的に解析するため、Methylated CpG island amplification-microarray (MCAM)法によりメチル化を解析し、メチル化レベルによってクラスタリング解析を行った。その結果、胃体部に及ぶ汎発性胃炎においてゲノムワイドな異常メチル化が生じていた。これらの結果から慢性胃炎でLINE-1低メチル化、CDH1、CDH13、PGP9.5の異常メチル化を認め、発癌過程においてはゲノム全体の低メチル化と関連して遺伝子プロモーターの高メチル化が同時に起こること、胃体部に炎症がおよぶ汎発性胃炎において、ゲノムワイドなメチル化異常を認めることが明らかとなった。今後、高メチル化を示す症例をフォローアップし、慢性胃炎におけるDNAメチル化が発癌リスクを予測するための分子マーカーとして有用であるか検討する予定である。また、癌におけるゲノムワイドな低メチル化は、クロマチン構造の異常を引き起こし、染色体不安定性を誘導すると考えられており、LINE-1メチル化レベルは癌の悪性度予測に有用であると考えられた。

  • Research Products

    (18 results)

All 2008

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (10 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] LINE-1 hypomethylation is associated with increased CpG island methylation in helicobactor pylori-related enlarged fold gastritis.2008

    • Author(s)
      Yamamoto E., et al.
    • Journal Title

      Cancer Epidemiol. Biomarker. Prev. 17

      Pages: 2555-2564

    • Peer Reviewed
  • [Journal Article] DNA hypermethylation contributes incomplete synthesis of carbohydrate determinants in gastrointestinal cancer.2008

    • Author(s)
      Kawamura YI., Et al.
    • Journal Title

      Gastroenterol. 135

      Pages: 142-151

    • Peer Reviewed
  • [Journal Article] Epigenetic silencing of microRNA-34b/c and BTG4 is associated with CpG island methylation in colorectal cancer.2008

    • Author(s)
      Toyota M., et al.
    • Journal Title

      Cancer Res. 68

      Pages: 4123-4132

    • Peer Reviewed
  • [Journal Article] A requirement for DICER to maintain full promoter CpG Island hypermethylation in human cancer cells.2008

    • Author(s)
      Ting A., et al.
    • Journal Title

      Cancer Res. 68

      Pages: 2670-2675

    • Peer Reviewed
  • [Journal Article] Cytoplasmic RASSF2A is a proapoptotic mediator whose expression is epigenetically silenced in gastric cancer.2008

    • Author(s)
      Maruyama R., et al.
    • Journal Title

      Caroinogenesis 29

      Pages: 1312-1318

    • Peer Reviewed
  • [Journal Article] Frequent epigenetic inactivation of SFRP genes in hepatocellular carcinoma.2008

    • Author(s)
      Takagi H., et al.
    • Journal Title

      J. Gastroenterol. 43

      Pages: 378-389

    • Peer Reviewed
  • [Journal Article] Histon deacetylase inhibitor FK288 enhances adenovirus-mediated p53 family gene therapy in cancer models.2008

    • Author(s)
      Sasaki Y., et al.
    • Journal Title

      Mol. Cancer Ther. 7

      Pages: 779-787

    • Peer Reviewed
  • [Presentation] Treatment with a new IGF-1 receptor tyrosine kinase inhibitor for human corectant careinomas.2008

    • Author(s)
      Adachi Y., et al.
    • Organizer
      The 36^<th> Meeting of the International Society of Oncology and BioMarkers
    • Place of Presentation
      Tokyo
    • Year and Date
      2008-10-09
  • [Presentation] Anti-tumor efficacy of anti-FGFR1 monoclonal antibody for human hepatoma cells.2008

    • Author(s)
      Sasaki S., et al.
    • Organizer
      The 36^<th> Meeting of the International Society of Oncology and BioMarkers
    • Place of Presentation
      Tokyo
    • Year and Date
      2008-10-09
  • [Presentation] Line-1 hypomethylation is associated with increased CpG island methylation in H. pylori-related enlarged fold2008

    • Author(s)
      Hosokawa M., et al.
    • Organizer
      The 36^<th> Meeting of the International Society of Oncology and BioMarkers
    • Place of Presentation
      Tokyo
    • Year and Date
      2008-10-09
  • [Presentation] Epigenetic silencing of microRNA-34b/c and BTG4 is associated with CpG island hypermethylation in colorectal cancer.2008

    • Author(s)
      Suzuki H., et al.
    • Organizer
      The 36^<th> Meeting of the International Society of Oncology and BioMarkers
    • Place of Presentation
      Tokyo
    • Year and Date
      2008-10-08
  • [Presentation] The gene silencing due to hepermethylation of promoter CpG island tend to be induced in the common target Genes for both EZH2 and DNMTs.2008

    • Author(s)
      Taniguchi H., et al.
    • Organizer
      The 36^<th> Meeting of the International Society of Oncology and BioMarkers
    • Place of Presentation
      Tokyo
    • Year and Date
      2008-10-08
  • [Presentation] Blockade of insulin-like growth factor-I receptor is a useful anticancer therapeutic for esophageal squamous cell carcinoma.2008

    • Author(s)
      Yamamoto H., et al.
    • Organizer
      Digestive Disease Week 2008
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2008-05-21
  • [Presentation] Relationship between laterally spreading Type, JC virus and methylator phenotype in colorectal adenoma.2008

    • Author(s)
      Yamamoto H., et al.
    • Organizer
      Digestive Disease Week 2008
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2008-05-20
  • [Presentation] Epigegetic downregulation of the hedgehog interacing protein gene is frequently involved in gastrointestinal tumorigenesis.2008

    • Author(s)
      Yamamoto H., et al.
    • Organizer
      Digestive Disease Week 2008
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2008-05-18
  • [Presentation] High levels of aberrant DNA methylation in Helicobacter pylori-related pangastritis.2008

    • Author(s)
      Yamamoto E., et al.
    • Organizer
      Digestive Disease Week 2008
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2008-05-18
  • [Presentation] Glypican-3, in conjunction with MMPs Wnt signaling molecules, plays an important role in the progression of Hepatocellular carcinoma.2008

    • Author(s)
      Miyamoto C., et al.
    • Organizer
      Digestive Disease Week 2008
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2008-05-18
  • [Patent(Industrial Property Rights)] 癌の検出方法および検出用キット、ならびに癌治療剤.2008

    • Inventor(s)
      鈴木 拓, 豊田 実, 篠村恭久, 他2名
    • Industrial Property Rights Holder
      札幌医科大学
    • Industrial Property Number
      特願2008-121671
    • Filing Date
      2008-05-07

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Published: 2010-06-11   Modified: 2016-04-21  

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