アフコシル化IgGは,エンベロープされたウイルス反応を特徴づけ,COVID-19の重症度と相関しています
Mads Delbo Larsen1,2, Erik L de Graaf1,2, Myrthe E Sonneveld1,2
1Department of Experimental Immunohematology, Sanquin Research, Amsterdam, Netherlands.
まとめ
Afucosylated Immunoglobulin G (IgG) 抗体は,封じ込められたウイルスを標的とし,免疫反応を強化します. 重症のCOVID-19患者の高いレベルは,抗体グリコシレーションを強調するサイトカインストームを増幅する.
科学分野:
- 免疫学
- グライコバイオロジー
- ウイルス学
背景:
- 免疫グロブリンG (IgG) 抗体は病原体に対する防御に不可欠です.
- IgG- Fc尾の重要なN結合グリカンが機能に影響し,ヒトでは変化する.
- Afucosylated IgGの変種は,FcγRIIIaの関与によって治療的な抗体活性を増強する.
研究 の 目的:
- 包装されたウイルスに対する免疫反応におけるアフコシレイテッドIgGの特定の役割を調査する.
- COVID-19の重症度および関連する病変とアフコシレートされたIgGの関連性を決定する.
主な方法:
- 異なる抗原型に対するアフコシレイテッドIgGの流行の分析
- アフコシル化IgGによるFcγRIIIa応答の評価
- 疾患の重度が異なるCOVID-19患者のSARS-CoV-2に対するアフコサイレートされたIgGの定量化.
主要な成果:
- Afucosylated IgGは,他の抗原ではなく,封装されたウイルスに対して特異的に生成されます.
- これらの変異はより強いFcγRIIIa反応を誘発しますが,サイトカインストームを悪化させることがあります.
- 重症のCOVID-19患者は,SARS-CoV-2に対するアフコシレイテッドIgGの値が上昇しており,炎症の増加と相関しています.
結論:
- 抗体グリコシライゼーション,特にアフコシライゼーションは,抗ウイルス免疫において,特にエンベロープされたウイルスの場合,極めて重要です.
- アフコシル化IgGは,COVID-19のような感染症の予防免疫と潜在的に有害な高炎症の両方に寄与します.
- この発見は,宿主防衛と疾患の病原性におけるIgGの複雑な役割を強調しています.
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