オートファギー・ライソソーム機能の転写制御は,臓がんの代謝を駆動する
Rushika M Perera1,2,3, Svetlana Stoykova1,2, Brandon N Nicolay1,3
1Center for Cancer Research, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Nature
|July 14, 2015
まとめ
臓がん細胞は,転写因子を活性化することによって,オートファジーと呼ばれるプロセスを使って生存します. これらの要因であるMiT/TFEファミリーは,細胞代謝を再プログラムして,腫瘍の成長に必要な必須アミノ酸レベルを維持します.
科学分野:
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
- メタボリズムは
背景:
- 細胞のストレス反応は,がん細胞の生存と代謝性ホメオスタシスにとって極めて重要です.
- 臓管状腺がん (PDA) は,病原性のためにオートファギーに大きく依存しています.
- PDAにおけるオートファジーと代謝再プログラミングを制御する規制メカニズムは,依然としてほとんど不明である.
研究 の 目的:
- PDAにおけるオートファギーを活性化する規制回路を解明する.
- PDA細胞の代謝がどのように再プログラムされるかを特定するために.
- これらのプロセスにおける転写因子の役割を調査する.
主な方法:
- リソソームの生体生成と栄養素の収集を調整する転写プログラムの分析.
- 人間のPDA細胞における転写因子 (MITF,TFE3,TFEB) のMiT/TFEファミリーを調査する.
- 代謝変化を評価するために,グローバルメタボライトプロファイリング.
主要な成果:
- PDAにおけるオートファギーの誘導は,MiT/TFEの転写因子によって媒介される転写プログラムの一部である.
- MiT/TFEタンパク質は,細胞プラズマの保持から切り離され,核インポートが増加します.
- MiT/TFEの活性化は,リソソームのカタボリック機能を駆動し,PDA内の細胞内アミノ酸のプールを維持するために不可欠です.
結論:
- MiT/TFEタンパク質は,臓がんにおける代謝再プログラムの主調節体である.
- リソソーム中心のクリアランス経路の転写活性化は,攻撃的な臓がんの重要な特徴です.
- MiT/TFE媒介経路をターゲットにすることで,PDAに対する新しい治療戦略を提供することができる.
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