T細胞アクセサリー分子CD2828によるインタールイキン-2遺伝子増強剤の活性を調節する
J D Fraser1, B A Irving, G R Crabtree
1Howard Hughes Medical Institute, University of California, San Francisco 94143.
まとめ
T細胞のCD28を刺激すると,特定の経路が活性化し,インタールイキン-2 (IL-2) 遺伝子の活性を増強するタンパク質複合体を形成します. この発見は,T細胞リンフォキンの産生を調節する新しいメカニズムを明らかにしています.
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.
- 細胞シグナリング 細胞シグナリング
背景:
- 細胞表面分子によるT細胞リンフォキンの生成の調節は完全に理解されていません.
- インタールイキン-2 (IL-2) 産生は,T細胞抗原受容体とは分離したシグナル伝達経路によって調節することができる.
研究 の 目的:
- T細胞リンフォキンの産生を調節するCD28分子の役割を調査する.
- CD28がインタールイキン-2 (IL-2) 遺伝子に影響を与える特定のメカニズムを特定する.
主な方法:
- 人間のT細胞におけるCD28の刺激.
- タンパク質複合体の形成とIL-2遺伝子への結合の分析.
- IL-2増強剤の活性量の定量化.
主要な成果:
- CD28刺激により,新しいタンパク質複合体の形成が誘発された.
- この複合体は,IL-2遺伝子のユニークな部位 (−164と−154塩基対の間の部位) に結合する.
- CD28刺激によりIL-2増強剤の活性が5倍に増加しました.
結論:
- CD28は,IL-2遺伝子発現を強化する独特の信号伝達経路を提供します.
- IL-2遺伝子の特定されたCD28反応性要素は,他のリンパホキンの遺伝子に保存され,より広範な調節作用を示唆しています.
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