腫瘍遺伝子の誘発による変異またはアポトーシスに対する細胞のコミットメントは,転写因子IRF-1に依存しています
N Tanaka1, M Ishihara, M Kitagawa
1Institute for Molecular and Cellular Biology, Osaka University, Japan.
Cell
|June 17, 1994
まとめ
インターフェロン調節因子1 (IRF-1) は,腫瘍抑制剤として作用する. マウスにおけるIRF-1の喪失は,腫瘍遺伝子の誘発による細胞変異を可能にし,アポトーシスを防止し,IRF-1を強調する.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- 免疫学 免疫学とは
背景:
- インターフェロン調節因子1 (IRF-1) とIRF-2は,インターフェロン (IFN) システムと細胞成長の重要な調節因子です.
- IRF-1は転写活性化剤として機能し,IRF-2は反抗抑制剤として作用する.
- これらの要因の調節不良は,細胞増殖と腫瘍の発達に影響を与える可能性があります.
研究 の 目的:
- 腫瘍遺伝子の誘発による細胞変容におけるIRF-1の役割を調査する.
- IRF-1が腫瘍抑制剤として作用するかどうかを判断する.
- 腫瘍遺伝子の誘発によるアポトーシスにおけるIRF-1の関与を解明する.
主な方法:
- IRF-1ノックアウトマウス (IRF-1-/-) から胚性線維芽細胞 (EFs) の生成.
- EFsに活性化されたc-Ha-ras腫瘍遺伝子を導入.
- IRF-1cDNA再導入による細胞変容,アポトーシス,および抑制の分析.
主要な成果:
- IRF-1-/- EFsは,野生型またはIRF-2-/- EFsではないが,c-Ha-rasオンコゲンによって変換された.
- IRF-1-/- EFsの変形フェノタイプは,IRF-1cDNAを発現させることで抑制され,IRF-1の腫瘍抑制機能が確認されました.
- c-Ha-ras発現は,野生型のEFでアポトシスを誘発するが,特定の条件下でIRF-1-/- EFではそうではない.
結論:
- IRF-1は,重要な腫瘍抑制剤として機能します.
- IRF-1は,腫瘍遺伝子の活性化に反応して,細胞が変異またはアポトーシスを受けるかどうかを決定する上で重要な役割を果たします.
- IRF-1は,腫瘍遺伝子の誘発による細胞変容とアポトーシスの重要な決定因子です.
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