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アミノ酸の双方向輸送はmTORとオートファギーを調節する
Paul Nicklin1, Philip Bergman, Bailin Zhang
1Respiratory Diseases Area, Novartis Institutes for BioMedical Research, Novartis Horsham Research Centre, West Sussex, UK.
Cell
|February 11, 2009
まとめ
細胞へのアミノ酸輸送,特にL-グルタミン吸収と放出は,哺乳類のラパミシン (mTOR) 経路の標的を活性化し,細胞の成長とタンパク質合成を制御するために不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 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.
背景:
- アミノ酸は,哺乳類のラパミシン (mTOR) キナーゼの標的を活性化するために不可欠です.
- mTORは,タンパク質翻訳,細胞成長,オートファギーを含む重要な細胞プロセスを調節します.
- mTORへのアミノ酸シグナル伝達に関与する特定の細胞表面トランスポーターは,依然としてほとんど特定されていません.
研究 の 目的:
- アミノ酸の吸収とその後mTORへのシグナル伝達に責任を負う細胞表面トランスポーターを特定する.
- アミノ酸の流れがmTORの活性化,細胞の成長,およびオートファギーを調節するメカニズムを解明する.
主な方法:
- mTORの活性化におけるL-グルタミン吸収と流出の役割を調査した.
- SLC1A5トランスポーター機能の遺伝子操作を利用した.
- アミノ酸輸送におけるSLC7A5/SLC3A2トランスポーター複合体の機能を分析した.
主要な成果:
- エッセンシャルアミノ酸 (EAA) の存在下でのL-グルタミンの細胞吸収と急速な流出は,mTOR活性化のための速度制限ステップです.
- SLC1A5トランスポーターはL-グルタミン吸収を調節し,その喪失は細胞の成長を阻害し,オートファギーを促進する.
- SLC7A5/SLC3A2トランスポーター複合体は,同時にL-グルタミン流出とL-ルシン/EAA流入を媒介する.
- L-グルタミン濃度が高い腫瘍細胞は,mTOR活性化のための吸収要件を回避することができます.
結論:
- SLC1A5およびSLC7A5/SLC3A2トランスポーターによって媒介されるL-グルタミン流は,mTOR信号伝達の主要な調節体です.
- この流動は,細胞の成長,増殖,タンパク質の翻訳,そしてオートファギーを調整する.
- この経路を理解することで,がん細胞増殖の代謝調節に関する洞察が得られます.
関連する概念動画
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