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DELE1によって調整される経路は,ミトコンドリアのストレスをシトソールに伝達する
Evelyn Fessler1, Eva-Maria Eckl1, Sabine Schmitt2
1Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Munich, Germany.
Nature
|March 6, 2020
まとめ
科学者はミトコンドリアのストレスと 細胞の統合ストレス反応を 結びつける新しい経路を発見しました この経路はミトコンドリアのプロテアゼOMA1とタンパク質DELE1が関与し,細胞の恒常性にとって重要なキナーゼHRIを活性化させます.
科学分野:
- 細胞生物学
- ミトコンドリア生物学
- ストレス反応のシグナル
背景:
- ミトコンドリア機能障害は 細胞のホメオスタシスに影響を与え 老化や病気に関与しています
- 統合ストレス反応 (ISR) を活性化するために,ミトコンドリアのストレスシグナルがサイトゾールに伝達されなければならない.
- ミトコンドリアの乱れとISRの活性化を結びつける特定の分子機構は不明でした.
研究 の 目的:
- ミトコンドリアのストレス信号を 細胞溶液に伝達する分子成分を特定する.
- ミトコンドリア損傷時に統合ストレス反応 (ISR) を引き起こす経路を解明する.
主な方法:
- ゲノム工学とハプロイド遺伝学を使って 偏見のないスクリーニングを行いました
- 主要なISR媒介体であるC/EBP同質タンパク質 (CHOP) の誘導に影響を与える遺伝子を特定することに焦点を当てています.
主要な成果:
- OMA1 (ミトコンドリア・プロテアゼ) とDELE1をミトコンドリアのストレス反応経路の重要な成分として特定した.
- OMA1の活性化により,DELE1が分裂し,HRIキナーゼを活性化する細胞溶液を形成することが示された.
- このOMA1-DELE1-HRI軸は,ISRへのミトコンドリアストレスシグナルの欠けているリンクを構成しています.
結論:
- OMA1-DELE1-HRI経路はミトコンドリアストレスの重要な媒介です.
- この経路を理解することで,ミトコンドリア機能障害を含む疾患の 治療対象となる可能性があります.
- この経路を調節することで 細胞がミトコンドリアの損傷に 反応する仕組みが作られます
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