大きさに依存する分離は,抗体対象のマクロファージファゴシトーシスを制御する
Matthew H Bakalar1, Aaron M Joffe1, Eva M Schmid2
1Department of Bioengineering, University of California, Berkeley, Berkeley, CA 94720, USA; UC Berkeley/UC San Francisco Graduate Group in Bioengineering, Berkeley, CA 94720, USA.
Cell
|June 30, 2018
まとめ
抗原の高さはマクロファージのファゴシトーシスにとって重要です. 短い抗体は,抗体とFc受容体の接触を可能にすることで,免疫反応を促進し,病気に対する細胞防御を強化します.
科学分野:
- 免疫学
- 細胞生物学
- バイオ物理学
背景:
- マクロファージは重要な免疫細胞で 抗体によるオプソン化細胞をファゴサイトーシスで除去します
- 免疫反応を誘発する抗体の効果は様々で,その背後にあるメカニズムは十分に理解されていません.
- 抗原の構造と大きさは,抗体結合およびその後の細胞相互作用に影響することが知られている.
研究 の 目的:
- マクロファージのファゴシトーシスを調節する重要な抗原高さの値を定義する.
- Fc受容体の信号伝達に抗原サイズが影響する物理的メカニズムを解明する.
- より効果的な治療用抗体の設計に役立つ.
主な方法:
- 抗体対象細胞の 再構成モデルを使用した.
- 抗原の高さによって量化されたファゴサイトーシス率.
- Fc受容体とフォスファタゼCD45の空間分離を調査した.
- 観察されたシグナルイベントにおけるインテグリンの役割を評価した.
主要な成果:
- 標的の表面から10 nm以上で抗体が位置すると,ファゴサイトーシスが有意に低下した.
- 抗原の高さの低下はFc受容体のリン酸化とファゴサイトーシスを促進した.
- この効果は,CD45からのFc受容体のインテグリン独立分離によって媒介された.
- マクロファージと標的細胞の密接な接触は,効率的なファゴシトーシスにとって不可欠です.
結論:
- 抗原の高さの値は,マクロファージ媒介のファゴシトーシスを調節する.
- 短い抗体は,シグナリング成分の物理的分離を促進することによって,Fc受容体の活性化を促進する.
- 短い抗原を標的とする治療抗体は,最適化されたFc受容体シグナル伝達によって免疫反応を強化する.
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