NF-κBは,損傷したミトコンドリアの除去を通じて炎症体の活性化を制限する
Zhenyu Zhong1, Atsushi Umemura2, Elsa Sanchez-Lopez1
1Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA; Department of Pathology, School of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
Cell
|February 27, 2016
まとめ
核因子 κB (NF-κB) は,p62媒介のミトファギーを促進し,損傷したミトコンドリアを浄化することによって,炎症を抑制する. この経路は 過剰な炎症体の活性化を制限し 細胞死亡を防止し 組織修復を促進します
科学分野:
- 免疫学
- 細胞生物学
- 分子医学
背景:
- 核因子 κB (NF-κB) は炎症に不可欠であり,NLRP3炎症体を活性化させながら,抗炎症機能も十分に理解されていない.
- 炎症におけるNF-κBの二重な役割は,炎症反応を制御するための規制メカニズムを理解することを必要としています.
研究 の 目的:
- NF-κBが過剰な炎症とNLRP3炎症体の活性化を抑制するメカニズムを解明する.
- NF-κB媒介の抗炎症作用におけるオートファギー受容体p62/SQSTM1の役割を調査する.
主な方法:
- p62/SQSTM1の蓄積を調べることで,NF-κBの抗炎症効果を調査した.
- NLRP3刺激に反応するミトコンドリア損傷,ミトファジー,および炎症体の活性化を研究した.
- この経路のin vivo機能を評価するために,マクロファージ特異的なp62アブレーションモデルを使用した.
主要な成果:
- NF-κBは,p62の蓄積を遅らせ,ミトファジーによる損傷したミトコンドリアのクリアランスを促進する.
- NLRP3の活性化により,カスペーゼ-1/NLRP3の独立したミトコンドリア損傷が引き起こされ,mtDNAやmtROSのような炎症体活性化物質が放出されます.
- 過剰なIL-1β誘発の炎症とマクロファージの死亡を防ぐため,p62はパーキン・ユビキチン化された損傷したミトコンドリアを認識し,除去する.
結論:
- NF-κB-p62-mitophagy経路は,炎症を制御する重要なネガティブなフィードバックループです.
- この経路はNF- kBの炎症性作用を制限し,免疫ホメオスタシスを維持し,組織修復を支援します.
- この経路をターゲットにすることで 炎症性疾患の治療戦略を提案できます
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