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Updated: Aug 14, 2026

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Directed Differentiation of Induced Pluripotent Stem Cells towards T Lymphocytes
Published on: May 14, 2012
ICOSは誘導性T細胞共刺激剤で,構造的にも機能的にもCD28に関連しています
A Hutloff1, A M Dittrich, K C Beier
1Molecular Immunology, Robert Koch-Institut, Berlin, Germany.
Nature
|February 4, 1999
まとめ
研究者らは,T細胞の新たな調節体である誘導性共刺激器 (ICOS) を発見した. ICOSは,抗原に対するT細胞の反応とB細胞の抗体分泌を強化し,適応免疫における重要な役割を果たします.
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.
- 細胞生物学 細胞生物学
背景:
- CD28とCTLA-4は,免疫反応の重要なT細胞調節体である.
- CD28は,効果的な抗原応答のためのT細胞機能を促進します.
- CTLA-4はCD28信号のバランスをとって,免疫過剰刺激を防ぐ.
研究 の 目的:
- 新しいT細胞のレギュレータを特定する.
- 新しく特定されたT細胞分子の機能を記述する.
- 適応免疫におけるICOSの役割を明らかにする.
主な方法:
- タンパク質の識別と特徴付け.
- T細胞の活性化と機能の分析.
- 人体組織におけるイン・ビボ発現の研究.
主要な成果:
- CD28/CTLA-4ファミリーの3番目のメンバーとして,誘導性共刺激剤 (ICOS) を特定しました.
- ホモディメアタンパク質であるICOSは,T細胞の増殖,リンフォカインの分泌,B細胞の増殖を促進する.
- CD28とは異なり,ICOSは誘導を必要とし,IL-2を上調させないが,IL-10の産生を高める.
- ICOSは,B細胞の成熟の場所である生殖中心のT細胞に発現します.
結論:
- ICOSは,適応性免疫システムの重要なレギュラーである.
- ICOSはT細胞とB細胞の相互作用と免疫反応において重要な役割を果たします.
- ICOSの発見は,免疫システムの調節に関する私たちの理解を広げています.
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