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mTOR複合体1は,SREBP経路を制御するためにリピン1の局所化を調節します
Timothy R Peterson1, Shomit S Sengupta, Thurl E Harris
1Whitehead Institute for Biomedical Research, Koch Center for Integrative Cancer Research at MIT, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
Cell
|August 6, 2011
まとめ
栄養素キナーゼmTOR複合体1 (mTORC1) は,リピン1核への侵入を調節することによって,成長を制御する. このメカニズムはSREBPの活性に影響を与え,マウスの遺伝子転写と代謝疾患耐性に影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- メタボリズムは
- 分子生物学は分子生物学である.
背景:
- ラパミシン複合体1 (mTORC1) の機械的標的は,細胞の成長と代謝の重要な調節因子である.
- ステロール調節要素結合タンパク質 (SREBPs) は,脂質とコレステロール合成の重要な転写因子である.
- mTORC1がSREBPの活動に影響を与える正確なメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- mTORC1のシグナル伝達とSREBPの機能を結びつける分子メカニズムを解明する.
- リピン1がmTORC1依存のリポゲネシスとステロゲネシスの調節を媒介する役割を調査する.
- ダイエット誘発の代謝障害におけるmTORC1-リピン1-SREBP経路のインビオ関連性を決定する.
主な方法:
- タンパク質の相互作用と酵素活性を評価するために生化学的測定を用いた.
- SREBPの標的遺伝子発現とプロモーター活性を監視するために,細胞ベースの測定法を使用した.
- 肝臓特異的なmTORC1阻害と高脂肪/高コレステロールの食事によるマウスモデルを用いたin vivo試験を実施した.
主要な成果:
- mTORC1がリピン1の核転位を制御することを実証した.
- 脱酸化した核リピン1は,mTORC1がSREBPの活性と標的遺伝子発現に及ぼす影響を媒介するために不可欠であることを示した.
- 肝臓のmTORC1を阻害することで,リピン1に依存する食事誘発性肝臓ステアトーシスと高コレステロール血症に対する抵抗性が認められる.
結論:
- mTORC1-SREBPシグナリング軸における重要なメディエーターとして確立されたリピン1.
- lipin 1 の核エントリをmTORC1.1 によって制御される重要な規制ステップとして特定しました.
- 代謝疾患におけるmTORC1-リピン1経路を標的とした治療の可能性を強調した.
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