mTORC1経路は,SIRT4を抑制することによってグルタミン代謝と細胞増殖を刺激する
Alfred Csibi1, Sarah-Maria Fendt, Chenggang Li
1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|May 14, 2013
まとめ
ラパミシン複合体1 (mTORC1) の哺乳類標的は,グルタミン脱水素酶 (GDH) の主要な調節体であるSIRT4を阻害することによってグルタミン代謝を活性化します. この経路は癌において極めて重要であり,新たな治療目標を示唆している.
科学分野:
- 細胞の代謝は細胞の代謝である.
- 分子生物学は分子生物学である.
- がん研究 がん研究
背景:
- 増殖する細胞は,生物合成とエネルギーのためにグルタミンを使用します.
- ラパミシン複合体1 (mTORC1) の哺乳類標的は,栄養素代謝の増加と関連しています.
- mTORC1とグルタミノリシスの間の分子関連は不明でした.
研究 の 目的:
- mTORC1がグルタミン代謝に影響を与える分子メカニズムを解明する.
- mTORC1媒介のグルタミノリシスにおけるSIRT4の役割を調査する.
- がんにおけるこの経路を標的とした治療の可能性を探求する.
主な方法:
- グルタミン酸脱水素酵素 (GDH) 活性に対するmTORC1の活性化の影響を調査した.
- GDHの調節におけるSIRT4の役割を評価した.
- mTORC1がSIRT4の発現とCREB2.2経由での安定性に与える影響を調査した.
- 人間の癌組織におけるSIRT4発現を分析した.
- 癌細胞増殖と腫瘍発達のSIRT4過剰発現の影響を評価した.
主要な成果:
- mTORC1の活性化は,GDHを活性化することによって,グルタミンアナプレロシスを促進する.
- この活性化は,GDHの阻害体であるSIRT4の転写抑制によって媒介されます.
- mTORC1はCREB2を不安定化し,SIRT4の発現が低下する.
- SIRT4発現はヒトのがんでは減少している.
- SIRT4の過剰発現は,がん細胞の増殖,変容,腫瘍の成長を抑制する.
結論:
- mTORC1は,SIRT4/GDH軸を通してグルタミン代謝を調節する.
- mTORC1-SIRT4経路は,がんの発症に関与しています.
- mTORC1-高いがんの栄養素代謝をターゲットにすることは,潜在的な治療戦略です.
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