Atg7はp53の活性を調節し,代謝ストレス中の細胞サイクルと生存を調節する
In Hye Lee1, Yoshichika Kawai, Maria M Fergusson
1Center for Molecular Medicine, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA.
まとめ
オートファジー遺伝子Atg7は,栄養素の取り除く過程で細胞サイクル停止に不可欠です. それはp53を調節し,細胞分裂とアポトーシスを制御し,DNA損傷とマウスの致死性を防止します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 栄養素の取り残しは,細胞循環停止,オートファジー,細胞死を引き起こします.
- これらのストレス反応の相互作用は完全に理解されていません.
研究 の 目的:
- 栄養素欠乏に対する細胞反応におけるオートファギー遺伝子Atg7の役割を調査する.
- Atg7,細胞周期調節,および細胞死経路の関係を解明する.
主な方法:
- Atg7.7が欠けているマウスの胚性線維芽細胞を使用した.
- 分析された細胞サイクル進行,p53結合,p21 (((CDKN1A)) 転写,DNA損傷,アポトーシス.
- Chk2 削除がマウスのAtg7 (((-/-) 生存率に与える影響を調査した.
主要な成果:
- Atg7欠乏細胞は,飢餓時に細胞サイクルを止めることができませんでした.
- Atg7はp53に直接結合し,p21 ((CDKN1A) の発現をp53の酵素活性とは無関係に調節する.
- Atg7の欠如は,長時間ストレス下でのDNA損傷とp53-依存アポトーシスの増加につながった.
- DNAダメージ反応を阻害することで,Atg7(-/-) マウスの致死率が部分的に回復しました.
結論:
- Atg7は,栄養素欠乏による細胞サイクル停止に不可欠です.
- Atg7はp53の活性を調節し,細胞サイクル停止とアポトーシスを制御する.
- Atg7は,栄養素の制限に対する細胞のストレス反応を管理する上で重要な役割を果たします.
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