HIVに感染した人の記憶B細胞から隔離された中和抗体の広範な多様性
Johannes F Scheid1, Hugo Mouquet, Niklas Feldhahn
1Laboratory of Molecular Immunology, The Rockefeller University, New York, New York 10065, USA.
Nature
|March 17, 2009
まとめ
研究者は,HIVに感染した患者の記憶抗体反応を特徴づけた. 彼らは,HIV表面タンパク質gp140に対するB細胞の記憶応答には,gp120の様々なエピトープを標的とした高親和性中和抗体を生成する複数のクローンが含まれていることを発見しました.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- 感染症 感染症は感染症です.
背景:
- HIV表面タンパク質 gp140の保存されたエピトープを標的にする抗体は,霊長類において保護を提供する.
- 一部のHIV感染者は,広範に中和する免疫グロブリン (Ig) G抗体の高いレベルを持っていますが,その特異性はよく理解されていません.
研究 の 目的:
- 広範に中和する抗体を持つ患者のHIVに対する記憶抗体反応を特徴づけるために.
- これらの記憶B細胞由来抗体の特異性と活性性を特定する.
主な方法:
- HIV感染患者6人のHIV封筒結合記憶B細胞から502個の抗体をクローン化しました.
- 選択された患者は,広範に中和する抗体と,低から中間のウイルス負荷を持っていた.
- HIV gp120タンパク質の様々なエピトープに対する抗体の特異性を分析した.
主要な成果:
- これらの患者のgp140に対するB細胞記憶応答は,最大50個の独立したクローンを構成していました.
- これらのクローンは,高親和性の中和抗体を産生した.
- 抗体はgp120の変回路,CD4結合部位,共受容体結合部位,CD4結合部位近くの新種のエピトープを標的とした.
結論:
- 広範なHIV中和活性を持つ患者のIgG記憶B細胞区は,複数のクローン反応によって特徴付けられています.
- これらの反応は,HIV gp120タンパク質のいくつかの異なるエピトープに対して向けられ,広範な中和に寄与します.
- これらの反応を理解することで,効果的なHIVワクチンや治療法の開発を促すことができます.
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