結腸直腸がんの生存者および分子病原性
Paul J Kim1, Janet Plescia, Hans Clevers
1Department of Cancer Biology and the Cancer Center, University of Massachusetts, Medical School, Worcester, MA, USA.
Lancet (London, England)
|July 30, 2003
まとめ
転写因子であるT細胞因子 (TCF) /β-カタニンは,大腸がん細胞における生存遺伝子の発現を活性化します. これは,細胞の成長を促し,細胞死を防ぐことで,癌を誘発する可能性があります.
科学分野:
- 分子生物学は分子生物学である.
- がん研究 がん研究
- 遺伝学 遺伝学とは
背景:
- 結腸直腸がんの発症は,結腸クリプト細胞の異常遺伝子発現と関連しています.
- T細胞因子 (TCF) /β-カタニン経路は,この異常な遺伝子発現に関与しています.
- 細胞死と増殖を調節するタンパク質であるSurvivinは,大腸がんでは再発現する.
研究 の 目的:
- 結腸直腸がんにおける生存遺伝子発現の調節におけるTCF/β-カタニンの役割を調査する.
- survivinが結腸直腸がん細胞で再発するメカニズムを理解する.
主な方法:
- プロモーター分析,ミュータゲネシス,および電離性移動性シフトアッセイは,大腸がん細胞における遺伝子発現を研究するために使用されました.
- インサイトハイブリダイゼーションと免疫ヒストケミストリーは,胚性腸の生存表現を調べました.
- アポトーシスの変化は,安定したβ-カタニン変異を有する細胞系で監視されました.
主要な成果:
- TCF/β-カタニンは,大腸がん細胞における生存遺伝子発現 (6-12倍) を有意に増加させた.
- 生き残ったプロモーターにおけるTCF結合要素の突然変異は,遺伝子発現を75-79%減少させた.
- ベータ-カテニンの変異を安定させることで,生存者の発現が強化され,アポトーシスから保護されました.
結論:
- サバイバーンのTCF/β-カタニン活性化により,大腸クリプトに幹細胞のようなフェノタイプを与える可能性があります.
- このフェノタイプは,細胞の増殖とアポトーシスに対する抵抗性の増加を伴う.
- この発見は,結腸直腸がんの分子病原性を理解するのに寄与する.
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