Z-核酸センシングはZBP1依存性ネクロプトーシスおよび炎症を引き起こす
Huipeng Jiao1,2, Laurens Wachsmuth1,2, Snehlata Kumari1,2
1Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
Nature
|April 17, 2020
まとめ
Z-DNA結合タンパク質1 (ZBP1) は内在的なZ型核酸を感知し,死滅と炎症を引き起こす. この発見は,ZBP1に光を当てます.
科学分野:
- 分子生物学
- 免疫学
- 遺伝学
背景:
- Z-DNAとZ-RNAの生物学的な役割はほとんど不明である.
- Z-DNA結合タンパク質1 (ZBP1) は,ウイルスに対する宿主防御に関与するZ型核酸のセンサーである.
- ウイルスの感染がない場合でのZBP1の活性化は十分に理解されていません.
研究 の 目的:
- 内生リガンドによるZBP1活性化のメカニズムを調査する.
- 非ウイルス性炎症状態におけるZBP1の役割を解明する.
主な方法:
- 特定の遺伝子変異 (Ripk1mR/mR,RIPK1E-KO,FADDIEC-KO) を有するマウスモデルを使用した.
- 様々な組織におけるZBP1媒介性死滅と炎症を評価した.
- 細胞核酸へのZBP1結合とZαドメインの役割を調査した.
主要な成果:
- 固有のリガンドのZα依存感知は,ZBP1媒介の胎児死亡,皮膚炎,大腸炎を誘発する.
- 機能的なZαドメインはZBP1誘発の死滅に不可欠である.
- ZBP1の活性化は核内で起こり,潜在的に内生的なレトロエレメントから派生した核Z型核酸の認識を示唆する.
結論:
- ZBP1による内在的なZ型核酸の検知は,RIPK3依存性ネクロプトーシスと炎症を引き起こす.
- この経路は,特にRIPK1およびCASP8変異を有する個体において,慢性炎症状態に寄与する可能性があります.
- 潜在的ZBP1リガンドとして,レトロエレメントからの内生双鎖RNAを特定した.
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