セリン飢餓は,がん細胞におけるストレスとp53依存の代謝再構成を誘発する
Oliver D K Maddocks1, Celia R Berkers, Susan M Mason
1The Beatson Institute for Cancer Research, Switchback Road, Glasgow G61 1BD, UK.
Nature
|December 18, 2012
まとめ
腫瘍抑制タンパク質p53 (TP53とも呼ばれる) は,セリン代謝を管理することによって,がん細胞が代謝ストレスから生き残るのを助けます. p53の喪失は,この反応を損なうので,p53欠乏性腫瘍の潜在的な治療法としてセリン枯渇を示唆しています.
科学分野:
- 細胞の代謝は細胞の代謝である.
- 癌生物学 がん生物学
- 腫瘍抑制機能は,腫瘍を抑制する機能です.
背景:
- 癌細胞は,成長と増殖のための代謝適応を示します.
- 腫瘍抑制タンパク質p53 (TP53) は,糖分解と抗酸化反応を含む様々な代謝経路を調節する.
- p53は,アポトーシスの役割とは異なり,代謝ストレス下での細胞生存を促進することができます.
研究 の 目的:
- ストレス下でのがん細胞生存におけるセリン代謝の役割を調査する.
- セリン欠乏に対する細胞の反応を調節するp53の機能を決定する.
- p53欠乏性腫瘍におけるセリン枯渇の治療の可能性を調査する.
主な方法:
- 人間の癌細胞におけるセリン利用と代謝経路活性化の分析.
- p53-p21 (CDKN1A) の活性化と細胞サイクル停止の評価.
- セルロースの抗酸化能力とセルロースの生存能力の評価.
- p53欠乏性腫瘍におけるセリン枯渇のインビボモデリング.
主要な成果:
- 人間の癌細胞は,外因的なセリンを素早く消費する.
- セリン欠乏はセリン合成経路を活性化し,エアロビック・グリコロシスを抑制し,トリカルボキシル酸サイクルへのフクロスを増加させます.
- p53-p21の活性化と細胞サイクル停止は,抗酸化能力を維持し,グルタチオンの合成へのセリンチャネリングを促進します.
- p53欠乏細胞は,酸化ストレス,生命力の低下,およびセリン枯渇時に増殖の障害を示します.
- セリン枯渇は,特にp53欠乏したモデルでは,がん細胞の増殖にインビヴォで影響を及ぼします.
結論:
- p53は,セリン代謝と抗酸化剤防御を調節することによって,代謝ストレス中にがん細胞の生存に重要な役割を果たします.
- セリン枯渇は,p53.3によって媒介される適応的な代謝および細胞サイクル反応を誘発する.
- この発見は,特にp53欠乏性腫瘍におけるセリン代謝をターゲットにすることが,新たな治療戦略を提示する可能性があることを示唆している.
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