変化した細胞サイクル停止と遺伝子増幅の可能性は,野生型のp53の喪失に伴います
L R Livingstone1, A White, J Sprouse
1Lineberger Comprehensive Cancer Center, Department of Pathology, University of North Carolina, School of Medicine, Chapel Hill 27599-7295.
Cell
|September 18, 1992
まとめ
野生型のp53アレルの喪失は,正常な細胞や1つの機能的なp53アレルを持つ細胞とは異なり,細胞内の高周波遺伝子増幅を可能にします. これは,p53がp53であることを示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- がん研究 がん研究
背景:
- 遺伝子増幅は,変形した細胞では頻繁に行われるが,正常な線維芽細胞では存在しない.
- 遺伝子の増幅を調節するp53腫瘍抑制遺伝子の役割は完全に理解されていません.
研究 の 目的:
- 遺伝子増幅を可能にするためにp53アレルの変化が十分であるかどうかを調査する.
- 薬物誘発のストレスと遺伝子増幅に対する細胞応答に対するp53状態の影響を決定する.
主な方法:
- 異なるp53アレルステータス (ワイルド型,1変異型,2変異型) の細胞における遺伝子増幅周波数の比較.
- 薬物治療に反応する細胞成長停止の評価.
- 細胞サイクル進行におけるp53の役割とその遺伝子増幅との潜在的なリンクの分析.
主要な成果:
- ワイルド型p53アレルの1つを保持した細胞は,正常な行動を示し,成長を停止し,増幅を示さなかった.
- 機能的なp53アレルがない細胞は,成長を止めることができず,高周波遺伝子増幅を示した.
- ワイルド型p53を持つ腫瘍細胞も遺伝子増幅を示し,代替経路が存在することを示した.
結論:
- 野生型のp53機能の喪失は,高周波遺伝子増幅を可能にする重要な要因です.
- p53の損失は,細胞サイクル制御の変化によって増幅を促進する可能性があります.
- 代替メカニズムは,遺伝子増幅におけるp53の調節作用を回避することができます.
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