低酸素に対する乳酸誘発反応.
Dong Chul Lee1, Hyun Ahm Sohn1, Zee-Yong Park2
1Medical Genomics Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Korea.
Cell
|April 21, 2015
まとめ
この研究は,乳酸がNDRG3タンパク質を安定させ,Raf-ERK経路を活性化させる新しい低酸素独立経路を明らかにしています. この乳酸駆動のシグナリングは,血管新生と細胞成長を促進し,低酸素に関連した疾患に対する新しい治療目標を提供します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 生理学 生理学とは
背景:
- 生物は,低酸素 (低酸素) に対する反応を,ホメオスタシスおよび病気のために必要とします.
- 低酸素誘導因子 (HIF) は既知の調節因子ですが,HIFから独立した経路も存在します.
研究 の 目的:
- 低酸素シグナル伝達のための新しい乳酸依存メカニズムの解明.
- この経路におけるNDRG3タンパク質の役割を特定する.
主な方法:
- 異なる酸素条件下で乳酸とNDRG3タンパク質の相互作用を調査した.
- PHD2/VHL依存分解測定法を使用しました.
- Raf-ERK経路の活性化と血管新生や細胞成長などの下流効果を調べました.
- 細胞の乳酸生成を抑制する効果を評価した.
主要な成果:
- NDRG3タンパク質はノルモキシアでは分解され,ヒポキシアでは乳酸の蓄積によって安定します.
- 安定したNDRG3はc-Rafと結合し,Raf-ERK経路を活性化します.
- この経路は血管新生と細胞成長を促進します.
- 乳酸生成の抑制は,NDRG3媒介の低酸素反応を無効化する.
結論:
- 乳酸の蓄積は,NDRG3.3を安定させることで,HIF独立の低酸素反応を直接誘発する.
- NDRG3-乳酸塩-Raf-ERK軸は,低酸素誘発の血管新生と細胞成長の重要な媒介である.
- この経路は,低酸素に関連した疾患の潜在的治療標的を提示します.
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