コドン特異的な翻訳再プログラミングは,標的治療に対する耐性を促進する
Francesca Rapino1,2, Sylvain Delaunay1,2, Florian Rambow3,4
1Laboratory of Cancer Signaling, University of Liège, Liège, Belgium.
Nature
|June 22, 2018
まとめ
振動性tRNA改変酵素は,メラノーマ細胞の生存と薬剤耐性にとって極めて重要です. これらの酵素の抑制は MAPK信号伝達とともに メラノーマの有望な治療策となります
科学分野:
- 分子生物学
- 腫瘍学
- 生物化学
背景:
- mRNAの翻訳再プログラミングは,がんの発生と薬剤耐性に関連しています.
- 翻訳再プログラムに 基づく正確な分子メカニズムは 未知のままです
- タンパク質合成中の正確なコドン解読には,振動型tRNAの改変が不可欠である.
研究 の 目的:
- BRAF V600E誘発性メラノーマにおけるバブルウリジン34 (U34) tRNA修飾酵素の役割を調査する.
- MAPK阻害剤に対する治療抵抗に対するU34酵素の関与を調査する.
- U34酵素,タンパク質合成,メラノーマ細胞生存のメカニズム的関連を解明する.
主な方法:
- BRAF V600EメラノーマモデルにおけるU34酵素発現の分析
- MAPKシグナル伝達とU34酵素の同時抑制による細胞活性の評価 (ELP3,CTU1,CTU2).
- PI3K経路の活性化とそのU34酵素発現への影響の調査
- HIF1A mRNAトランスレーションとHIF1αタンパク質の酵素媒介による調節の検討.
主要な成果:
- BRAF V600E メラノーマ細胞は U34酵素に依存して生存しています.
- MAPKシグナル伝達とU34酵素の結合阻害は,シネージ的細胞毒性を示しています.
- 抵抗メカニズムであるPI3K経路の活性化により,U34酵素の発現が著しく上昇する.
- U34酵素は,HIF1Aの翻訳を調節し,HIF1αタンパク質のレベルを維持することによって,メラノーマの糖分分解を促進します.
結論:
- U34酵素は,BRAF V600Eメラノーマにおけるタンパク質合成の再配線の重要な媒介者である.
- MAPK阻害剤と併用して,U34酵素を標的とした治療は,メラノーマに対する潜在的な治療戦略です.
- 高濃度のU34酵素とHIF1αは,抗BRAF治療に対する得られた耐性に関連しており,メラノーマ細胞生存と治療耐性を促進する役割を強調しています.
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