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ADAR1は,自発的なZBP1の活性化を抑制することで,自己炎症を予防する
Richard de Reuver1,2, Simon Verdonck1,2, Evelien Dierick1,2
1VIB-UGent Center for Inflammation Research, Ghent, Belgium.
Nature
|July 21, 2022
まとめ
RNA編集酵素ADAR1は通常,自己RNAが免疫反応を誘発するのを防ぐ. ADAR1の喪失はZBP1を活性化し,細胞死と炎症を引き起こし,アイカルディ・グティエール症候群に寄与する.
科学分野:
- 免疫学
- 分子生物学
- 遺伝学
背景:
- ADAR1 (RNA1に作用するアデノシンデミナーゼ) は,免疫刺激性二鎖RNA (dsRNA) を制限する.
- ADAR1の活性が低下すると,ヒトではアイカルディ・グティエール症候群 (Aicardi- Goutières syndrome,AGS) が発症し,マウスでは自己炎症が発症する.
- ADAR1のA-to-I編集は,dsRNAセンサーのMDA5とPKRの過剰活性化を防止する.
研究 の 目的:
- ZBP1の活性化を抑制するADAR1の役割を調査する.
- ZBP1の活性化がADAR1欠乏に関連した病理に寄与するメカニズムを解明する.
- ZBP1媒介の細胞死と炎症を予防するADAR1のZαドメインの役割を決定する.
主な方法:
- ADAR1欠乏細胞とマウスモデルの分析
- ZBP1の活性化,アポプトーシス,および死滅の評価
- Alu要素の編集におけるADAR1のZαドメイン機能の調査.
主要な成果:
- ADAR1は自発的なZBP1の活性化を阻害する.
- ZBP1の活性化により,ADAR1欠乏細胞のカスパース8依存アポトーシスとMLKL媒介性死滅を引き起こす.
- ZBP1はADAR/MAVS欠乏したマウスの胚死亡率と死亡率に寄与する.
- ADAR1のZαドメインは,ZBP1媒介の腸細胞死と皮膚炎を,Alu要素を編集することによって防ぐ.
結論:
- ADAR1はZBP1による細胞死と炎症を予防する.
- Alu dsRNAによるZBP1の活性化は,ADAR1機能喪失のシナリオにおけるAGSの病原化に寄与する.
- ZBP1をターゲットにしたり,ADAR1の活性を増強したりすることで,AGSの治療戦略を提供することができます.
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