HIVとその受容体をデンドリット細胞-T細胞の結合点に誘導する
David McDonald1, Li Wu, Stacy M Bohks
1Department of Microbiology and Immunology, University of Illinois, Chicago, IL 60612, USA.
Science (New York, N.Y.)
|May 6, 2003
まとめ
モノサイト系デンドリート細胞 (MDDC) は,感染することなくHIVをT細胞に捕獲し,転送します. HIVは細胞の接触部位に集中し,感染シナプス経由で感染を容易にします.
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
- 細胞生物学 細胞生物学
背景:
- モノサイト系デンドリート細胞 (MDDC) は,抗原プレゼンテーションに関与する重要な免疫細胞です.
- ヒト免疫不全ウイルス (HIV) はT細胞に感染し,免疫不全を引き起こす.
- dendritic cells (DCs) はHIV感染に関与されているが,そのメカニズムは不明である.
研究 の 目的:
- MDDCsがT細胞にHIV感染性を結合し,転送するメカニズムを調査する.
- MDDCによって媒介されるHIV感染における細胞と細胞の接触の役割を明らかにする.
主な方法:
- 生細胞顕微鏡を用いて,MDDC-T細胞相互作用中のHIVの動態を視覚化しました.
- MDDCsとT細胞の間に形成された細胞結合体の分析が行われました.
- HIVと関連する受容体 (CD4,CCR5,CXCR4) のインターフェースへのリクルートメントが評価されました.
主要な成果:
- MDDCはHIVを効果的に結合し,感染することなくHIVを転送します.
- HIVは,MDDCsとT細胞の細胞接触部位に徴募されることが観察されました.
- MDDC-T細胞結合の間,T細胞のHIV受容体 (CD4,CCR5,CXCR4) とMDDCのHIVは,抗原特異シグナル伝達がない場合でも,インターフェースに集中していました.
結論:
- MDDCは,T細胞へのHIV感染の効率的な媒介として機能する.
- MDDCsとT細胞の細胞対細胞接触は,HIVの感染を促進する.
- ウイルスと受容体の局所的濃度によって特徴づけられる感染シナプスの形成は,効率的なHIV感染伝播のメカニズムとして提案されています.
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