ピルーバートキナーゼM2は,低酸素誘導因子1のPHD3刺激による共同活性化剤です
Weibo Luo1, Hongxia Hu, Ryan Chang
1Vascular Program, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Cell
|May 31, 2011
まとめ
ピルバ酸キナーゼM2 (PKM2) タンパク質は,低酸素誘導因子1 (HIF-1) と相互作用して,がん細胞の遺伝子活性を高め,グルコース代謝を変化させます. この相互作用は腫瘍の成長を促し,がん細胞の機能を維持するためのフィードバックループを生み出します.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- がん研究 がん研究
背景:
- ピルーバートキナーゼM2 (PKM2) は,PKM2遺伝子の代替スライスされた産物であり,PKM1.1とは異なる.
- PKM2は,癌細胞のグルコース代謝と腫瘍発生を,その既知の酵素活性を超えたメカニズムで影響する.
研究 の 目的:
- 血糖代謝と腫瘍発生の調節におけるPKM2の役割を調査する.
- PKM2が低酸素誘導因子1 (HIF-1) の活性に影響する分子メカニズムを解明する.
主な方法:
- HIF-1によるPKM2遺伝子転写活性化を調査した.
- HIF-1αとのPKM2の相互作用と,HIF-1標的遺伝子のトランザクティベーションに対するその効果を分析した.
- 質量スペクトロメトリーと抗体測定を用いてPKM2機能におけるプロリルヒドロキシラーゼ3 (PHD3) の役割を調べました.
- PHD3のノックダウンが細胞代謝に与える影響を評価した.
主要な成果:
- PKM1ではなくPKM2は,HIF-1αと相互作用し,HIF-1結合とp300募集を強化して,HIF-1標的遺伝子のトランザクティベーションを促進します.
- プロリルヒドロキシラーゼ3 (PHD3) は,PKM2がHIF-1αと相互作用し,その共同活性化機能を強化する.
- PKM2はプロリン403/408で水酸化され,PHD3のノックダウンはPKM2の共活性化機能を低下させ,グルコースの吸収と乳酸の産生を減少させ,酸素の消費を増加させます.
- PKM2はHIF-1とポジティブなフィードバックループを形成し,がん細胞におけるグルコース代謝を再プログラムする.
結論:
- PKM2は,がん細胞の代謝を調節し,HIF-1との相互作用を通じて腫瘍形成を促進する上で重要な役割を果たします.
- PKM2-HIF-1相互作用は,がんにおける代謝再プログラムのための新しいメカニズムを表しています.
- PKM2-HIF-1経路を標的にすることは,がん治療の治療戦略を提供することができる.
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