一个全基因组的多维RNAi屏幕揭示了控制MHCII类抗原呈现的途径
Petra Paul1, Tineke van den Hoorn, Marlieke L M Jongsma
1Division of Cell Biology and Centre for Biomedical Genetics, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
Cell
|April 5, 2011
概括
研究人员确定了主要组织相容性复合体II类 (MHC-II) 表达和运输的关键调节者. 这项研究揭示了控制免疫反应的新途径,以及自身免疫性疾病治疗的潜在目标.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 主体组织相容性复合体II类 (MHC-II) 分子通过向T辅助细胞呈现来对免疫反应至关重要.
- MHC-II 功能障碍与自身免疫性疾病的发病有很大关系.
- 了解MHC-II表达和传输的调节对于开发治疗策略至关重要.
研究的目的:
- 为了确定组织特异性MHC-II转录的新型调节剂.
- 阐明控制树突细胞中MHC-II运输的分子机制.
- 整合多样化的数据集,以便在系统层面理解MHC-II抗原呈现.
主要方法:
- 全基因组RNAi选使用流细胞计来评估MHC-II表达和负载.
- 高通量测试用于验证初步发现.
- 多个大规模数据集的生物信息集成.
主要成果:
- 确定了9个通过反网络控制MHC-II转录的调节器,通过TGFβ.等信号通路进行更高阶调节.
- 发现GTPase ARL14/ARF7,以及效应器ARF7EP,可以控制MHC-II囊泡运输.
- 这种复合体介于人类树突细胞 (DC) 中的actin细胞骨架沿着MHC-II囊泡的运动.
结论:
- 本研究提供了对MHC-II抗原呈现的综合系统级分析.
- 已识别的调节器和途径为操纵感染性和自身免疫性疾病中的MHC-II呈现提供了潜在的目标.
- 这些发现推动了我们对免疫调节和疾病发病的理解.
相关概念视频
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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
MHC Class I: Presenting Endogenous...
Antigens Involved in Adaptive Immunity
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.


