免疫の逆進化:不死のB細胞のクローンは,ウイルスの脱出に対抗するために,ex vivoの指向的な進化を経験することができる
Casper Marsman1, Jurgen Heinen1, Vanessa Clerico Mosina1
1Kling Biotherapeutics, Amsterdam, Netherlands.
Frontiers in immunology
|September 3, 2025
まとめ
この研究は,不死のB細胞ライブラリを開発し,JN.1のような免疫脱出株を含む,進化するSARS-CoV-2変種に対して有効な抗体を生成するために進化を導いた.
科学分野:
- 免疫学
- ウイルス学
- バイオテクノロジー
背景:
- SARS-CoV-2の進化は,ワクチンと治療効果に課題をもたらします.
- 免疫脱出変異の出現は,適応可能な対抗策の迅速な開発を必要とします.
研究 の 目的:
- SARS-CoV-2の変種に対するクロス反応性中和抗体を特定するために,不死化したB細胞ライブラリを使用する.
- 新興のSARS-CoV-2変種に対する抗体結合と中和力の強化のために,指向進化を適用する.
主な方法:
- ヒトのB細胞をPBMCと桃体からレトロウイルスベクターを用いて不死化させる.
- B細胞ライブラリをスクリーニングし,中和するクローンを特定する.
- 抗体の親和性および交叉反応性を改善するために,体性高変異によるex vivoの進化を導いた.
- 中和抗体と広範囲結合抗体を組み合わせたバイパラトピー抗体を設計する.
主要な成果:
- SARS-CoV-2の中和活性を持つ12のユニークなB細胞クローンを特定した.
- デルタとBA.5の変種に対する強力な中和性を持つモノクローナル抗体を開発した.
- EG.5. 1とJN.1の免疫脱出変異に対する抗体の効能が強化された.
- エンジニアリングされたバイパラトピック抗体は,JN.1とKP.3の変異に対して強化された効能を示した.
結論:
- 不死のB細胞ライブラリと 導かれた進化は 進化するウイルスに対する治療薬の開発に有効です
- このアプローチは,新興のSARS-CoV-2変種と戦うための適応性抗体反応を生み出すための迅速な経路を提供します.
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