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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
Published on: January 7, 2019
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UNC93B1は,TLR7のシグナリングを抑制し,自己免疫を防ぐためにシンテニン-1を募集します
Olivia Majer1, Bo Liu2, Lieselotte S M Kreuk1
1Division of Immunology and Pathogenesis, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.
Nature
|September 24, 2019
まとめ
トール型受容体 (TLR) チャペロンUNC93B1は,TLR7のシグナル伝達を特異的に制限し,TLR7に依存する自己免疫を防ぐ. このメカニズムは,UNC93B1がシンテニン-1に結合し,TLR7をエクソソームに分類し,活性化値を設定することを含む.
科学分野:
- 免疫学
- 分子生物学
- 細胞生物学
背景:
- TLR7 と TLR9 のようなトール型受容体 (TLR) は自己核酸を認識し,全身性赤血性狼などの自己免疫疾患において異なる役割を果たします.
- TLR7の活性化はマウスモデルで病気を悪化させる一方,TLR9の欠乏は病気を悪化させ,異なる調節メカニズムを示唆する.
- TLR7とTLR9の調節,特に負の調節を区別する正確な分子メカニズムは,ほとんど不明のままである.
研究 の 目的:
- TLR7とTLR9のシグナリングを制御するTLRトラフィキングチャペロンUNC93B1の機能を調査する.
- UNC93B1がTLR7とTLR9のシグナリング値を区別するメカニズムを明らかにする.
- UNC93B1がTLR7依存の自己免疫を防ぐ方法を理解する.
主な方法:
- マウスモデルを用いてTLR7とTLR9の密輸とシグナル伝達におけるUNC93B1の役割を調査した.
- UNC93B1とシンテンイン1とTLR7の相互作用を分析した.
- エクソソームにおけるUNC93B1とTLR7の存在と,多胞体分類におけるその役割を調べた.
主要な成果:
- UNC93B1はTLR9とは異なり,TLR7の信号伝達を限定し,マウスのTLR7による自己免疫を防ぐ.
- UNC93B1の変異により,TLR7のシグナル伝達が強化され,エクソソーム生物形成に関与するタンパク質であるシンテニン-1との結合が妨げられます.
- UNC93B1とTLR7はエクソソームに存在し,UNC93B1とシンテニン-1の相互作用により,TLR7が内小胞に分類され,シグナル伝達が終了する.
結論:
- UNC93B1はTLR7のネガティブレギュレータとして作用し,TLR9の密輸における役割とは異なる.
- UNC93B1のリン酸化依存結合は,TLR7の活性化とシグナリングを動的に調節する.
- UNC93B1は,人身売買だけでなく,自己反応性TLR7の活性化値を設定し,それによって自己免疫を防ぐために重要です.
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