すべてのインフルエンザAサブタイプを認識する抗体の構造と機能の分析
Nicole L Kallewaard1, Davide Corti2, Patrick J Collins3
1Department of Infectious Disease and Vaccines, MedImmune LLC, One MedImmune Way, Gaithersburg, MD 20878, USA.
Cell
|July 26, 2016
まとめ
MEDI8852という新しいヒト単一クローン抗体は,ヘマグルチニンタンパク質の保存された領域を標的として,すべてのインフルエンザA亜型を効果的に中和します. この広範囲の抗体は,既存の治療法と比較して優れた有効性と治療窓を示しています.
科学分野:
- 免疫学
- ウイルス学
- 構造生物学
背景:
- インフルエンザウイルスは抗原ドリフトによる継続的な脅威であり,免疫逃避とワクチンの有効性の低下につながります.
- 現存する治療法やワクチンは インフルエンザの急速な進化によって 挑戦されています
研究 の 目的:
- すべてのインフルエンザAヘマグルチニン (HA) サブタイプに対して有効な広範囲のヒト単体抗体 (mAb) を分離し,特徴づけること.
- 抗体の広範な中和活動と治療の可能性の構造的基礎を明らかにする.
主な方法:
- 人間のモノクローナル抗体のMEDI8852の分離と特徴付け.
- マウスとフレットモデルでの in vivo 効果試験
- インフルエンザHAタンパク質と複合した抗体のFab断片の結晶分析.
主要な成果:
- MEDI8852は,すべてのインフルエンザAHAサブタイプに対して強力で広範な中和性を示しています.
- 構造分析は,HA融合領域の保存された領域にユニークな結合エピトープを明らかにします.
- この抗体は,臨床前モデルではオセルタミビルよりも優れた有効性とより広い治療窓を示しています.
結論:
- MEDI8852は,インフルエンザAウイルスの感染に対する有望な広範囲免疫療法です.
- 独特の結合メカニズムと 高い効能が インフルエンザの 進化する性質に対する 解決策となる可能性があります
- MEDI8852のさらなる開発は,ヒトの治療用途のために正当化されています.
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