cGAS-STING経路は,COVID-19におけるIFN型免疫病変を駆動する
Jeremy Di Domizio1, Muhammet F Gulen2, Fanny Saidoune1
1Department of Dermatology, CHUV University Hospital and University of Lausanne (UNIL), Lausanne, Switzerland.
Nature
|January 19, 2022
まとめ
インターフェロン遺伝子 (STING) のサイクルGMP-AMP合成酵素 (cGAS) 刺激経路は,COVID-19における有害な炎症を誘発する. マウスにおけるSTING抑制は肺炎を軽減し,治療結果を改善し,新たな治療目標を示唆した.
科学分野:
- 免疫学
- ウイルス学
- 病理学について
背景:
- COVID-19の病原性は肺および肺外合併症を含む.
- タイプIインターフェロン (IFN) は,COVID-19において二重の役割を果たし,遅い段階での持続的な増加は,不良の結果と関連しています.
- インターフェロン遺伝子 (STING) のサイクルGMP-AMP合成酵素 (cGAS) 刺激経路は,細胞塩基DNA感知と免疫応答において極めて重要です.
研究 の 目的:
- COVID-19における異常型IFN反応におけるcGAS-STING経路の役割を調査する.
- COVID-19における病理的炎症を引き起こす細胞メカニズムを特定する.
- COVID-19の潜在的な治療目標としてSTINGを探求する.
主な方法:
- IFNのサインを特定するために,COVID-19の皮膚症状をプロファイリングする.
- COVID-19患者の肺組織サンプルをcGAS-STING活動のために分析する.
- SARS-CoV-2感染とcGAS-STINGの活性化を研究するために,肺のチップモデルを使用した.
- SARS-CoV-2感染のマウスモデルにおけるSTINGの薬理学的抑制.
主要な成果:
- 傷ついた内皮の近くのマクロファージによって媒介されるCOVID-19の皮膚病変において,STING依存型IIFNシグネチャーが特定されました.
- cGAS-STING活動は,タイプIのIFN反応とCOVID-19肺における組織破壊と相関しています.
- SARS-CoV-2 感染症は,ミトコンドリア DNA の放出によって内皮細胞における cGAS-STING を活性化させ,細胞死と IFN の生成につながった.
- マウスのSTING抑制により,SARS-CoV-2による肺炎が著しく減少し,疾患のアウトカムが改善されました.
結論:
- cGAS-STING経路は,COVID-19における病理的タイプI IFN反応の重要な原動力である.
- cGAS-STINGの内皮細胞活性化は,COVID-19の肺病変に寄与する.
- STING抑制は,重度のCOVID-19に対する有望な宿主主導の治療戦略です.
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