B7RP-1とICOSによるT細胞共刺激
S K Yoshinaga1, J S Whoriskey, S D Khare
1Amgen Inc., Thousand Oaks, California 91320, USA. syoshina@amgen.com
Nature
|January 5, 2000
まとめ
新しい共刺激性受容体ICOSとそのリガンドであるB7関連タンパク質-1 (B7RP-1) が特定されました. この独特な経路は,CD28-B7相互作用とは独立してT細胞活性化と適応免疫を調節する.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- T細胞の活性化は,CD28のような受容体経由の共刺激と,T細胞受容体経由の抗原特異信号伝達に依存しています.
- CD28-B7経路に関連する新しい共刺激性受容体-リガンドペアが調査されています.
研究 の 目的:
- T細胞活性化に関与する新しい共刺激性受容体-リガンドペアを特定し,特徴づけること.
- 適応性免疫応答におけるICOSとB7RP-1の役割を明らかにする.
主な方法:
- ICOS受容体とそのリガンドであるB7RP-1の識別と特徴付け
- B7RP-1を使用したT細胞のインビトロ共刺激アッセイ.
- B7RP-1-Fc融合タンパク質を発現するトランスジェニックマウスと,B7RP-1-Fcで治療された過敏化したマウスを用いたインビボ試験.
主要な成果:
- 新型受容体ICOSは,活性化および記憶T細胞に発現し,その結合体B7RP-1はB細胞およびマクロファージに存在します.
- ICOSとB7RP-1はCD28-B7経路とは独立して機能し,B7RP-1はT細胞共刺激を in vitroで実証している.
- トランスジェニックのマウスはリンパ性多発症を示し,治療を受けたマウスは過敏性の増加を示し,インビボ共刺激活性を示した.
結論:
- ICOSとB7RP-1は,構造的にCD28-B7.7に関連した新しい,独特の共刺激性受容体-リガンドペアを構成しています.
- この経路は,T細胞の反応と適応性免疫系を調節する上で重要な役割を果たします.
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