受体相互作用蛋白2在先天性和适应性免疫反应中的参与
Arnold I Chin1, Paul W Dempsey, Kevin Bruhn
1Molecular Biology Institute, University of California, Los Angeles, California 90095, USA.
Nature
|March 15, 2002
概括
受体相互作用蛋白2 (Rip2) 对于对抗Listeria等细胞内细菌的宿主防御至关重要. 里普2缺乏会损害免疫细胞的激活和细胞因子的产生,强调其在免疫中的作用.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 微生物学 微生物学
背景情况:
- 宿主防御包括先天和适应性免疫.
- 细胞内细菌感染会激活巨细胞,中性粒细胞,NK细胞和TH1细胞.
- 受体相互作用蛋白2 (Rip2) 在这些过程中的作用尚不清楚.
研究的目的:
- 研究受体相互作用蛋白2 (Rip2) 在宿主防御机制中的生理作用.
- 阐明Rip2在针对细胞内病原体的免疫和炎症反应中的功能.
主要方法:
- 一代的Rip2缺乏的小鼠.
- 在小鼠和巨细胞中感染Listeria monocytogenes.
- 用脂聚糖 (LPS) 刺激巨细胞.
- 对NF-kappaB激活,内毒性冲击耐药性和细胞因子产生 (干扰素-,介质素-12) 的分析.
- 在T助手1和自然杀手细胞中对Stat4激活的评估.
主要成果:
- 缺乏Rip2的小鼠表现出明显减少抗击Listeria monocytogenes感染的能力.
- 来自Rip2缺乏的小鼠的巨细胞在L. monocytogenes感染或LPS治疗后表现出NF-kappaB激活的降低.
- 主导负Rip2抑制NF-kappaB激活,由Toll样受体4和Nod1介导.
- 缺乏Rip2的小鼠对致命的LPS诱导的内毒性休克有抵抗力.
- 从Rip2-缺陷小鼠的TH1和NK细胞中观察到干扰素马的产生受损,这与缺陷的互白素-12-诱导的Stat4激活有关.
结论:
- Rip2对于有效的宿主防御细胞内细菌感染至关重要.
- 在NF-kappaB激活途径中,Rip2起着至关重要的作用,包括涉及TLR4和Nod1的途径.
- Rip2是适当的干扰素-生产和Stat4激活所需的,影响TH1和NK细胞的功能.
- 这些发现强调了在多种免疫和炎症反应途径中对Rip2的需求.
相关概念视频
Cell-mediated Immune Responses
Overview
NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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Antigen Processing Pathways
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.
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