関連する実験動画
Updated: Jan 20, 2026
01:39
Endoplasmic Reticulum : RER and SER
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TNFは,ミトコンドリア・リソーマ・エンドプラズマ網膜回路を通して,結核における病原性プログラムされたマクロファージ・ネクロシスを誘発する
Francisco J Roca1, Laura J Whitworth1, Sarah Redmond2
1Molecular Immunity Unit, Department of Medicine, University of Cambridge, MRC Laboratory of Molecular Biology, Cambridge CB2 OQH, UK.
Cell
|September 3, 2019
まとめ
結核の感染したマクロファージの死滅により,菌糸体が細胞外で放出されます. カルシウムチャネルとライオノジン受容体をターゲットにすることで マクロファージのプログラム細胞死を阻害できます
科学分野:
- 細胞生物学
- 免疫学
- 微生物学
背景:
- マクロファージの死滅は結核の病原性において極めて重要であり,ミコバクテリアの拡散を可能にします.
- 腫瘍死滅因子 (TNF) は,ミトコンドリアの活性酸素種 (ROS) とサイクロフィリンDによってマクロファージ死滅を誘発する.
研究 の 目的:
- マイコバクテリアに感染したマクロファージのプログラム性死滅を引き起こす 臓器間信号伝達経路を解明する.
- マクロファージの死滅を防ぐための薬剤可能な標的を特定する.
主な方法:
- Mycobacterium marinumとMycobacterium tuberculosisで感染したゼブラフィッシュのモデルを使用した.
- ミトコンドリアのROS,リソソームのセラミド,BAX,およびカルシウムシグナル伝達の役割を調査した.
- ライオジン受容体とL型カルシウムチャネルの関与を調べた.
主要な成果:
- マクロファージの死滅は 臓器間回路であり,ミトコンドリア内部のみではありません.
- ミトコンドリアのROSはリゾソームのセラミドを誘導し,細胞溶融BAXを活性化します.
- BAXはミトコンドリアに内プラズマ網膜のカルシウム放出を促進し,過剰負荷と死滅を引き起こします.
結論:
- 新しい経路が特定されました:ミトコンドリアのROS -> リソソームのセラミド -> BAX -> ERカルシウム放出 -> ミトコンドリアのカルシウム過負荷 -> ネクロス.
- ライアノジン受容体とL型カルシウムチャネルは重要な調節体であり,潜在的な治療標的である.
- これらの標的を遮断することで,感染したゼブラフィッシュとヒトのマクロファージの死滅を防ぐことができます.
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