mTORによる一時的なAPC/C不活性化は,細胞サイクルへの入り口で糖分解を刺激する
Debasish Paul1, Derek L Bolhuis2,3, Hualong Yan1
1Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA.
Nature
|July 31, 2025
まとめ
細胞サイクルに入る哺乳類の細胞は,アナフェーズ促進複合体/サイクロソーム (APC/C) を一時的に不活性化させ,糖分解を促進する. この代謝シフトは細胞分裂のための急速なバイオマスの蓄積をサポートします.
科学分野:
- 細胞生物学
- メタボリズム
- 生物化学
背景:
- 細胞循環への入り口には,迅速なATPと生物合成が必要で,これは糖分解を好む.
- アナフェーズ促進複合体/サイクロソーム (APC/C) は細胞分裂を調節するが,逆説的に糖分解を抑制する.
- 細胞サイクルと代謝の調整は細胞分裂に不可欠です.
研究 の 目的:
- 哺乳類の細胞が 細胞サイクルへの入り口と代謝の要求を 調整する方法を研究する.
- APC/C 活動にもかかわらず,細胞サイクル進行中に糖分解が促進されるメカニズムを解明する.
主な方法:
- 細胞サイクルへの入り口におけるAPC/C^CDH1の作用を調査した.
- 哺乳類の細胞モデルを用いて,APC/Cと糖分分解酵素レベルに対するミトゲン刺激の影響を研究した.
- APC/C機能とPFKFB3蓄積に対するmTOR媒介のCDH1リン酸化の影響を調べた.
主要な成果:
- 細胞サイクルへの入り口でAPC/Cが一時的に不活性化すると,代謝が糖分解にシフトする.
- ミトゲン刺激はmTOR媒介のCDH1リン酸化を誘発し,一部APC/ Cの無活性化につながる.
- この無活性化により,重要な糖分分解酵素であるPFKFB3が安定し,バイオマス生産のための糖分分解が強化されます.
結論:
- 細胞は,細胞サイクルのエントリーのために糖分解パルスを生成するために,一時的なAPC/C阻害を含む不一致のフィードフォワードループを使用します.
- このメカニズムは,迅速な細胞増殖のための十分なATPと生物合成中間物質を確保します.
- この研究は,細胞サイクル進行と細胞代謝の間の新しい調整戦略を明らかにしています.
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