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Published on: October 8, 2012
CD3delta对T细胞受体向ERK激活和胸细胞阳性选择发出信号
P Delgado1, E Fernández, V Dave
1Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Spain.
对于T细胞受体 (TCR) 正确信号发送,T细胞发育需要CD3delta链. 缺少CD3delta会损害ERK激活和胸细胞的阳性选择,这对于成熟的T细胞分化至关重要.
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:
- T细胞受体 (TCR) 综合体对于T细胞的发育和功能至关重要.
- CD3delta是TCR复合体的组成部分,但其在胸细胞阳性选择中的确切作用尚未完全理解.
- Ras/mitogen激活蛋白 (MAP) 激酶信号传递对T细胞成熟至关重要.
研究的目的:
- 为了研究CD3delta链在胸细胞阳性选择中的作用.
- 阐明受 CD3delta.缺失影响的信号通路.
- 为了确定CD3delta-deficient乳房细胞中T细胞成熟受损的基础分子机制.
主要方法:
- 在CD3delta淘汰赛小鼠中的胸细胞发育分析.
- 测试TCR参与测试以测量MAP激酶激活 (ERK).
- 在脂质中评估LAT和CD3zeta的氨酸酸化.
主要成果:
- 缺少CD3delta的胸细胞进展到双阳性阶段,但未能进行阳性选择.
- 缺少CD3delta特别损害了TCR参与时细胞外信号调节蛋白激酶 (ERK) 的MAP激酶激活.
- 在脂质中观察到LAT和CD3zeta的缺陷氨酸酸化在CD3delta-/-胸细胞中.
- 一个没有尾巴的CD3delta的表达拯救了ERK激活和积极选择.
结论:
- CD3delta对于有效的胸细胞阳性选择至关重要.
- CD3delta在阳性选择中的功能与其在脂质中调解CD3zeta和LAT氨酸酸化的能力有关.
- 由于脂质中的CD3zeta酸化缺陷导致LAT/Ras/ERK通路激活受损,导致CD3delta-/-胸细胞中阳性选择的阻断.
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