RUNX3発現の喪失と胃がんの因果関係
Qing Lin Li1, Kosei Ito, Chohei Sakakura
1Department of Biochemistry, College of Medicine, Institute of Medical Research, Chungbuk National University, 361-763, Cheongju, South Korea.
Cell
|April 17, 2002
まとめ
Runx3は胃上皮細胞の成長の重要なレギュラーです. Runx3機能の喪失は,マウスモデルとヒトの癌細胞で見られるように,胃がんの発生と進行に関連しています.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
背景:
- Runx3 (ラント関連転写因子3) は,細胞増殖とアポトーシスの調節に重要な役割を果たします.
- 胃上皮細胞ホメオスタシスは,胃癌の予防に不可欠です.
- 成長調節体の調節不全は,がんの病原性に関与している.
研究 の 目的:
- 胃上皮細胞における成長調節剤としてのRunx3の役割を調査する.
- RUNX3発現レベルとヒトの胃がん発症との関連を特定する.
- RUNX3変異が腫瘍抑制機能に与える影響を明らかにする.
主な方法:
- マウスのRunx3/Pebp2alphaCゼロ胃粘膜の分析.
- RUNX3発現とプロモーターメチレーションのためのヒト胃がん細胞系統の評価.
- 腫瘍発生性を評価するために,ヒトの胃がん細胞系を裸のマウスに異種移植する.
- RUNX3のラントドメイン変異体 (R122C) を生み出すためのサイト・ダイレクト・ミュータジェネシス.
主要な成果:
- Runx3 null マウスの胃粘膜は,上皮細胞における多発性,増殖性,抑制されたアポトーシスを示した.
- これらの細胞は,TGF-β媒介の成長抑制とアポトーシス誘導に抵抗していた.
- 人間の胃がん細胞の45-60%は,削除または高メチル化によるRUNX3発現の有意な減少を示した.
- 裸のマウスの腫瘍発生性は,RUNX3発現レベルと逆相関していた.
- RUNX3のRuntドメインの変異 (R122C) は,その腫瘍抑制活動を廃止しました.
結論:
- Runx3は胃上皮細胞の成長の主要な調節体であり,胃における重要な腫瘍抑制剤である.
- 削除,メチル化,または変異によるRUNX3機能の喪失は,胃がんの発生と進行と因果的に関連しています.
- RUNX3の機能を回復することは,胃がんの治療戦略である可能性があります.
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