ミトコンドリア DNA の 断裂 を 検知 する 核 感知 は,免疫 監視 を 強化 する
Marco Tigano1,2, Danielle C Vargas1, Samuel Tremblay-Belzile1,2
1Skirball Institute of Biomolecular Medicine, Department of Cell Biology, NYU School of Medicine, New York, NY, USA.
Nature
|February 25, 2021
まとめ
ミトコンドリアDNAのダブルストランド断裂は 細胞の免疫反応を引き起こします サイトプラズマのミトコンドリアRNAの蓄積は,これらのDNA破裂に対する固有の監視メカニズムとして機能する.
科学分野:
- 細胞生物学
- 免疫学
- 遺伝学
背景:
- ミトコンドリアDNA二重鎖断裂 (mtDSB) は,ミトコンドリア機能と細胞ホメオスタシスを破壊する有害なDNA病変である.
- ミトコンドリア-核のコミュニケーションの重要な役割にもかかわらず,mtDSBに対する核反応はよく理解されていません.
研究 の 目的:
- mtDSBに対する核反応を調査する
- mtDSBに対する細胞防御に関わるシグナル伝達経路を解明する.
主な方法:
- ミトコンドリアを標的としたトランスクリプションアクティベータのようなエフェクター核酸 (TALENs) を利用してmtDSBを誘導した.
- STAT1のリン酸化とインターフェロン刺激による遺伝子活性化を分析した.
- 反応におけるBAX,BAK,RIG-I,MAVSの役割を調査した.
- mtDNAのある細胞とない細胞に対する電離放射線の影響を評価した.
主要な成果:
- mtDSBは,STAT1リン酸化とインターフェロン刺激による遺伝子活性化を含むタイプIインターフェロン反応を活性化させる.
- BAXとBAKはミトコンドリアヘルニアを媒介し,ミトコンドリアRNAを細胞質に放出する.
- この放出はRIG- I- MAVS依存の免疫反応を誘発する.
- 細胞の免疫反応を高めるために 核DNAの損傷と連携します
結論:
- ミトコンドリアRNAの細胞質蓄積は,mtDSBに対する固有の免疫監視メカニズムとして機能する.
- このメカニズムは 細胞が遺伝子毒性物質によって引き起こされる DNAの破損に対処するのに役立ちます
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