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カスパース8は,アポプトーシス,ネクロプトーシス,およびパイロプトーシスの分子スイッチです
Melanie Fritsch1, Saskia D Günther1, Robin Schwarzer2
1Institute for Medical Microbiology, Immunology and Hygiene (IMMIH), CECAD Research Center, University of Cologne, Cologne, Germany.
Nature
|November 22, 2019
まとめ
マウスの非活性なカスパース-8 (CASP8 ((C362S)) は,ネクロプトーシスとピロプトーシスを誘導することによって胚の死亡を引き起こす. ネクロプトーシスを阻害すると,予期せぬ死が起こり,組織損傷を防止するカスパース-8の役割が明らかになった.
科学分野:
- 細胞生物学
- 免疫学
- 発達生物学
背景:
- カスパース8は外来アポトーシスを誘発し,死滅を抑制する.
- ネズミのカスパース8欠乏は胚の死亡につながるが,これは死滅経路を阻害することによって救出できる.
- 細胞死と組織ホメオスタシスの調節におけるカスパース - 8の酵素活性の正確な役割は,まだ完全に理解されていません.
研究 の 目的:
- 酵素的に不活性なカスパース-8 (CASP8 ((C362S)) 発現のインビボの結果を調査する.
- CASP8 ((C362S)) 誘発の病変において,死滅と炎症体の活性化の異なる役割を解明する.
- アポプトーシス,ネクロプトーシス,およびパイロプトーシスを制御する分子スイッチとしてのカスパース-8の機能を定義する.
主な方法:
- Casp8 ((C362S)) ミュータントマウスと複合ミュータントライン (例えば,Casp8 ((C362S)) Mlkl-/-) の生成.
- 胚の死亡率,心血管の欠陥,腸の炎症現象の分析
- ASCの斑点形成,カスパース - 1の活性化,およびIL - 1βの分泌を含む炎症体の活性化の評価.
主要な成果:
- CASP8 ((C362S) の発現は,内皮細胞死滅および心血管の欠陥による胚死亡を引き起こした.
- MLKL欠乏症は心血管の欠陥を救ったが,生後死亡を引き起こした.
- 腸内炎症を悪化させ,早死を引き起こし,炎症体の活性化 (ASC,カスパース-1, IL- 1β) が病理性を促進した.
結論:
- カスパース-8は,アポプトーシス,ネクロプトーシス,およびパイロプトーシスを調節する重要な分子スイッチとして作用します.
- CASP8 ((C362S) 誘発の病理学は,組織損傷における死滅と炎症体の活性化との相互作用を強調しています.
- カスパース8は,胚の発達と成人期における組織損傷を予防するために不可欠です.
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