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Published on: March 6, 2010
Cbl-bは,T細胞活性化のCD28依存を調節する
Y J Chiang1, H K Kole, K Brown
1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852, USA.
Nature
|January 26, 2000
まとめ
アダプター分子Cbl-bはT細胞の活性化を調節するので,Cbl-bが欠けているT細胞は,インタールイキン-2の産生のためにCD28の共刺激を必要としない. Cbl-b欠乏症は抗体反応を回復し,VaVの活性化を高め,自己免疫疾患の感受性に影響を与える.
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.
- 細胞シグナリング 細胞シグナリング
背景:
- T細胞の活性化には,T細胞抗原受容体 (TCR) とCD28による共刺激が必要です.
- TCR刺激だけでは,免疫耐性のメカニズムであるT細胞アナージーまたはデリエーションにつながる可能性があります.
- アダプター分子Cbl-bは,T細胞の信号伝達経路を調節する役割を果たします.
研究 の 目的:
- T細胞活性化とCD28依存におけるCbl-bの役割を調査する.
- Cbl-b欠乏がT細胞の反応と抗体生成に与える影響を決定する.
- Cbl-bシグナル伝達と自己免疫疾患の関連性を調査する.
主な方法:
- Cbl-b (Cbl-b(-/-) が不足しているT細胞の分析.
- Cbl-b-nullとCD28欠乏したマウスのインタールイキン-2生成とT細胞依存抗体応答の評価.
- ティロシンキナーゼ,Ras/MAPK,PLCガマ-1,Ca2+動員,およびVav活性化を含むTCR信号伝達経路の検査.
主要な成果:
- Cbl-b欠乏のT細胞は,CD28の共刺激なしにインタールイキン-2を産生した.
- Cbl-b-null変異は,CD28-/-マウスにおけるT細胞依存抗体応答を回復させた.
- Zap-70,Lck,Ras/MAPK,PLCgamma-1,Ca2+などのTCRシグナル伝達経路は影響を受けなかったが,Cbl-b(-/-) T細胞ではVav活性化が強化された.
結論:
- Cbl-bは,TCR媒介のVav活性化を選択的に抑制し,T細胞活性化におけるCD28依存性を影響する.
- Cbl-b調節されたシグナル伝達経路の調節不良は,多発性硬化症のような自己免疫疾患に寄与する可能性があります.
- Cbl-bは,T細胞のシグナル伝達と免疫耐性の重要なレギュレータです.
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