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Murine Model of CD40-activation of B cells
Published on: March 6, 2010
Cbl-b调节了T细胞激活的CD28依赖性
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
概括
适应分子Cbl-b调节T细胞激活,因为缺乏Cbl-b的T细胞不需要CD28的共同刺激来产生互白素-2. 缺乏Cbl-b可恢复抗体反应并增强VaV激活,从而影响自身免疫性疾病的易感性.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 激活T细胞需要通过T细胞抗原受体 (TCR) 和CD28进行共同刺激.
- 单独的TCR刺激可以导致T细胞无能或缺失,这是免疫耐受性的机制.
- 适配分子Cbl-b在调节T细胞信号通路方面发挥作用.
研究的目的:
- 研究Cbl-b在T细胞激活和CD28依赖中的作用.
- 确定Cbl-b缺乏对T细胞反应和抗体产生的影响.
- 探索Cbl-b信号传递与自身免疫性疾病之间的联系.
主要方法:
- 对缺乏Cbl-b (Cbl-b(-/-) 的T细胞的分析.
- 在Cbl-b-null和CD28缺乏的小鼠中评估介质素-2的产生和T细胞依赖的抗体反应.
- 检查TCR信号通路,包括氨酸激酶,Ras/MAPK,PLCgamma-1,Ca2+调动和Vav激活.
主要成果:
- 缺乏Cbl-b的T细胞在没有CD28协同刺激的情况下产生了互白素-2.
- 在CD28-/-小鼠中,Cbl-b-null突变恢复了T细胞依赖的抗体反应.
- 像Zap-70,Lck,Ras/MAPK,PLCgamma-1和Ca2+这样的TCR信号通路不受影响,但在Cbl-b(-/-) T细胞中增强了Vav激活.
结论:
- Cbl-b可以选择性地抑制TCR介导的VaV激活,从而影响T细胞激活中的CD28依赖性.
- 调节Cbl-b信号通路的失调可能导致诸如多发性硬化症之类的自身免疫性疾病.
- Cbl-b是T细胞信号传递和免疫耐受性的关键调节者.
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