需要化介导的IFN-γR2膜转移来激活巨细胞的先天反应
Xiaoqing Xu1, Jia Xu2, Jiacheng Wu2
1Department of Immunology and Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, 100005 Beijing, China; National Key Laboratory of Medical Immunology and Institute of Immunology, Second Military Medical University, 200433 Shanghai, China.
通过启用干扰素受体2 (IFN-γR2) 膜转位,增强先天免疫反应,E-选择素对李斯特菌感染期间的巨细胞激活至关重要.
科学领域:
- 免疫学
- 细胞生物学
- 传染性疾病
背景情况:
- 干扰素玛受体 (IFN-γR) 对于先天性免疫反应至关重要,其β子单元 (IFN-γR2) 转移到血.
- IFN-γR2膜转移的精确机制和重要性在很大程度上仍未被描述.
研究的目的:
- 阐明细胞质IFN-γR2转移到细胞膜的机制.
- 确定IFN-γR2膜转移对巨细胞激活和对细菌感染的天生的免疫的重要性.
主要方法:
- 使用E-选择素缺乏的小鼠和Listeria单细胞菌感染模型.
- 分析了巨细胞表面的IFN-γR2表达和IFN-γ信号.
- 研究了布鲁顿氨酸激酶 (BTK) 和EFhd2在IFN-γR2贩运中的作用.
主要成果:
- 缺少E-选择素会影响巨细胞的先天激活和IFN-γ信号传递,表面IFN-γR2也会减少.
- 诱导BTK化,从而促进EFhd2结合和IFN-γR2从戈尔吉细胞转移到血.
- 尽管巨细胞反应受损,但E-选择素缺乏的小鼠的循环IFN-γ水平增加.
结论:
- 细胞质IFN-γR2的膜转移是激活巨对细胞内细菌的先天免疫力的关键步骤.
- 细胞膜上功能性细胞因子受体的组合代表了先天激活和细胞因子信号的关键调节层.
- 在调节IFN-γR2细胞表面表达和巨细胞功能方面,E-选择素起到以前未知的作用.
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