通过NFAT激活,CD14通过LPS暴露后调节树突细胞生命周期
Ivan Zanoni1, Renato Ostuni, Giusy Capuano
1Department of Biotechnology and Bioscience, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy.
Nature
|June 16, 2009
概括
用脂聚糖 (LPS) 刺激树突细胞激活CD14通路,导致激活T细胞核因子 (NFAT) 激活. 这一途径对于树突细胞死亡,自我耐受性和预防自身免疫性至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子信号传输的方法
背景情况:
- 收费类受体 (TLR) 是关键的模式识别受体,参与天生的免疫力.
- TLR的激活触发信号通路,导致转录因子的激活和细胞因子的产生,如Interleukin-2.
- 状细胞在启动免疫反应和维持自我耐受性方面发挥着至关重要的作用.
研究的目的:
- 研究小鼠树突细胞中由脂聚糖 (LPS) 激活的信号通路.
- 确定CD14在LPS诱导的信号传递和树突细胞功能中的作用.
- 探索CD14介导信号在免疫调节和疾病中的影响.
主要方法:
- 用LPS刺激小鼠树突细胞.
- 对Src家族激酶和脂酶Cgamma2激活的分析.
- 测量细胞外Ca2+) 流入和核NFAT转位,依赖于氨酸.
- 在体内研究阻止CD14-NFAT通路.
主要成果:
- 激发LPS会诱导Src家族激酶和脂酶Cgamma2激活,Ca2+) 流入,以及在树突细胞中依赖氨酸的NFAT转位.
- 这一途径是独立于TLR4启动的,完全依赖CD14.
- 通过CD14诱导的LPS诱导的NFAT激活对于末端分化的树突细胞的亡至关重要.
- 阻断这种通路会延长树突细胞的存活时间,并增强T细胞的原始化能力.
结论:
- CD14专门启动LPS触发的信号通路,涉及树突细胞中的NFAT激活.
- 这种CD14-NFAT通路调节树突细胞生命周期,对于自我耐受性和预防自身免疫性至关重要.
- 针对CD14特异性信号提供了潜在的治疗策略,用于诸如败血症和慢性心力衰竭等疾病.
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