フェロプトーシスとミトコンドリアのROSは,SARS-CoV-2誘発の肝細胞死亡に中心的なものです
Cintia Cevallos1, Patricio Jarmoluk1, Franco Sviercz1
1Universidad de Buenos Aires (UBA), Consejo de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Laboratorio de Inmunopatogénesis Viral, Buenos Aires, Argentina.
Frontiers in cellular and infection microbiology
|August 27, 2025
まとめ
重症急性呼吸器症候群コロナウイルス2型 (SARS-CoV-2型) 感染症は,ミトコンドリアの機能を妨害し,細胞死の一種であるフェロプトーシスを促進することにより,肝臓の損傷を引き起こす. ミトコンドリアの反応性酸素種と鉄代謝をターゲットにすると,COVID-19の肝臓損傷に対する治療戦略が提供される可能性があります.
科学分野:
- ヘパトロジー
- ウイルス学
- 細胞生物学
背景:
- COVID-19は主に呼吸器疾患であり,肝臓の損傷とますます関連しています.
- SARS-CoV-2による肝細胞損傷のメカニズムは完全に理解されていません.
- ミトコンドリア機能障害,酸化ストレス,細胞死亡の調節がCOVID-19の病原性に関係しています.
研究 の 目的:
- 肝細胞ミトコンドリア機能,脂質代謝,細胞死経路に対するSARS-CoV-2感染の影響を調査する.
- 祖先のウーハンとオミクロンBA.5変種が肝細胞に与える影響を比較する.
- COVID-19 に関する肝臓損傷の潜在的な治療標的を特定する.
主な方法:
- Huh7.5肝細胞は武漢またはオミクロンBA.5のSARS-CoV-2変種に感染した.
- ウイルスの複製はRT-qPCR,核カプシドタンパク質検出,感染性粒子の定位を用いて評価された.
- ミトコンドリア機能,脂質代謝,細胞死 (アポプトーシス,ピロプトーシス,フェロプトーシス) は,様々な測定法と阻害剤を用いて分析された.
主要な成果:
- 両方のSARS-CoV-2変種は肝細胞に感染し,異なる複製パターンを示した.
- 感染はミトコンドリアの断片化,ミトコンドリアの活性酸素種 (mROS) の増加,脂質滴の蓄積を引き起こした.
- フェロプトーシスは,ACE2とTfR1の発現を上調した主要な細胞死メカニズムとして特定されました. mROSはウイルスの複製を阻害した.
結論:
- SARS-CoV-2は肝細胞のミトコンドリア・ホメオスタシスと脂質代謝を乱し,フェロプトーシスを誘発する.
- フェロプトーシスは,COVID-19におけるウイルス誘発性肝臓細胞病変の主要な要因である.
- ミトコンドリアのROSと鉄代謝は,COVID-19に関連した肝臓損傷の潜在的な治療目標です.
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