ミトコンドリアのROSはガスダーミンD媒介性死滅によって感染感を高めます
Chi G Weindel1, Eduardo L Martinez1, Xiao Zhao2
1Department of Microbial Pathogenesis and Immunology, Texas A&M Health, College of Medicine, Bryan, TX 77807, USA.
Cell
|July 30, 2022
まとめ
変異したLRRK2はミトコンドリアの機能を破壊し,マクロファージがネクロプトーシスに切り替わります. これは,Mycobacterium tuberculosis感染に対する反応として,高炎症と重度の病理に繋がります.
科学分野:
- 免疫学
- 細胞生物学
- ミトコンドリア生物学
背景:
- ミトコンドリア遺伝子の変異は炎症と感染感受性に関連しています.
- ミトコンドリア機能障害と免疫反応を結びつけるメカニズムは完全に理解されていません.
研究 の 目的:
- Lrrk2 G2019S変異がマクロファージにおけるミトコンドリアの恒常状態と細胞死経路にどのように影響するか調査する.
- Lrrk2変異の文脈で細胞死と免疫反応を媒介するガスダーミンD (GSDMD) の役割を解明する.
主な方法:
- Lrrk2 G2019S機能獲得アレルを発現するマクロファージを使用した.
- 炎症体活性化,ミトコンドリアの活性酸素種 (mtROS) 生成,細胞死経路 (死滅) を分析した.
- Mycobacterium tuberculosisに感染したLrrk2 G2019Sマウスの体内免疫病態を評価する.
主要な成果:
- Lrrk2 G2019S変異はミトコンドリアの恒常性を乱し,細胞死を再プログラムする.
- Lrrk2 G2019SマクロファージにおけるmtROSの上昇は,GSDMDをミトコンドリア膜に誘導し,死滅を促進する.
- Lrrk2 G2019Sマウスは,増強した死滅により,Mycobacterium tuberculosis感染時に高炎症と重度の免疫病理を呈している.
結論:
- ミトコンドリア機能障害は 細胞死様式を切り替えることで 免疫的結果を左右します
- GSDMDは,ネクロプトーシスを含む複数の細胞死経路の重要な実行者として機能します.
- GSDMD依存性ネクロプトーシスをターゲットにすると,LRRK2変異に関連した免疫病変が軽減されます.
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