IRF8はNLRC4炎症体活性化のためのNAIPの転写を調節する
Rajendra Karki1, Ein Lee2, David Place1
1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
Cell
|March 27, 2018
まとめ
インターフェロン調節因子8 (IRF8) は,細菌感染症に対する最適なNLRC4炎症体の活性化に不可欠です. IRF8はNAIPを調節し,サイトカインの産生とピロプトーシスを通して宿主防御を強化する.
科学分野:
- 免疫学
- 微生物学
- 細胞生物学
背景:
- インフラマソームの活性化は 微生物の病原体に対する 生まれつきの免疫に不可欠です
- NLRC4炎症ゾームは,NLRファミリーアポトーシス阻害タンパク質 (NAIP) を介して,細菌のフラゲリンまたはタイプIII分泌システム (T3SS) の成分を感知する.
- NLRC4炎症体活性化の調節は,まだ完全に理解されていません.
研究 の 目的:
- NLRC4炎症体活性化におけるインターフェロン調節因子8 (IRF8) の役割を調査する.
- IRF8が他の炎症性の経路に影響を及ぼすかどうかを判断する.
- 細菌感染に対する宿主防御におけるIRF8のインビヴォの重要性を評価する.
主な方法:
- Salmonella Typhimurium,Burkholderia thailandensis,Pseudomonas aeruginosaに感染した骨髄由来マクロファージを使用した.
- IRF8の存在と不在でNLRC4炎症ゾームの活性化を評価した.
- IRF8がNAIPの転写に与える影響を評価した.
- IRF8の炎症体依存性サイトカインの産生と in vivo pyroptosisの作用を検証した.
主要な成果:
- IRF8は,サルモネラ・ティフィムリウム,バークホルディア・タイランドネシス,プセドモナス・エアルギノサに対する最適なNLRC4炎症体の活性化に必要である.
- IRF8は正規および非正規のNLRP3,AIM2,およびピリン炎症体の活性化には不要である.
- IRF8はNAIPトランスクリプションを制御し,NLRC4の活性化のためにフラゲリンまたはT3SSコンポーネントの検出を可能にします.
- IRF8は,炎症体媒介のサイトカインの放出とピロプトーシスによって,細菌感染からインビボで保護します.
結論:
- IRF8はNAIPとNLRC4炎症体の活性化の重要なレギュラーである.
- IRF8は細菌感染に対する宿主の防御に重要な役割を果たします.
- IRF8は炎症型依存メカニズムを通じて免疫力を高める.
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