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マリック酵素2のゲノム切除は,臓がんにおける付随的致死性をもたらします
Prasenjit Dey1,2, Joelle Baddour3, Florian Muller4
1Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.
Nature
|January 19, 2017
まとめ
マリック酵素3 (ME3) を標的にすることで,マリック酵素2 (ME2) を欠いている臓がん細胞を選択的に殺します. ME2欠乏症の腫瘍における代謝の脆弱性を利用し,管腺癌 (PDAC) の新たな治療法を提供している.
科学分野:
- 生物化学
- 代謝経路
- 癌の遺伝学
背景:
- 管腺がん (PDAC) ゲノムには,SMAD4のような腫瘍抑制遺伝子の欠損がしばしば見られます.
- 隣接する遺伝子の喪失は がん治療に利用できる脆弱性を作り出すことができます
- ミトコンドリアのマリック酵素 (ME2およびME3) は,NADPH再生と活性酸素種 (ROS) ホメオスタシスに不可欠です.
研究 の 目的:
- PDACにおけるME2の喪失がME3の標的化に脆弱性を生み出すかどうかを調査する.
- ME2欠乏したPDAC細胞におけるME3を標的とした治療の可能性を調査する.
主な方法:
- ME2-null PDAC細胞におけるME3の遺伝的減少
- 統合されたメタボロミックと分子分析
- 活性酸素種 (ROS) レベルとAMP活性化タンパク質キナーゼ (AMPK) の活性化に関する調査
主要な成果:
- ME3の枯渇は選択的にME2-null PDAC細胞を殺した.
- ミトコンドリアのマリック酵素の欠乏はNADPHの減少とROSの上昇をもたらした.
- これはAMPKの活性化を引き起こし,SREBP1依存のBCAT2の転写を抑制し,核酸合成に影響を与えた.
結論:
- ME3はME2- null PDAC細胞に不可欠であり,がん特有の代謝的脆弱性を示しています.
- ME3を標的にすることは,PDACをSMAD4ロカス削除で治療するための"付随的致死性"戦略です.
- このアプローチは 多くの患者に 役立つかもしれません
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