RIPK3通过限制JAK-STAT信号传递而促进汉塔病毒复制,而不会引发亡
Yue Si1, Haijun Zhang2, Ziqing Zhou1
1Department of Microbiology, School of Basic Medicine, Air Force Medical University, Xi'an, 710032, China.
Virologica Sinica
|August 26, 2023
概括
汉塔安病毒激活RIPK3,一种细胞死亡蛋白,通过阻断STAT1.1来逃避干扰素免疫力. 删除 RIPK3 增强了抗病毒反应,并限制了病毒复制,揭示了一个新的病毒逃避策略.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 汉丹病毒 (HTNV) 导致严重的出血发烧与综合征 (HFRS).
- 干扰素 (IFN) 对于通过JAK-STAT通路对HTNV的抗病毒防御至关重要.
- 晚期HTNV感染通过不清楚的机制逃避IFN控制.
研究的目的:
- 阐明HTNV在晚期感染期间逃避干扰素反应的机制.
- 研究受体相互作用蛋白激酶3 (RIPK3) 在HTNV病原和宿主免疫逃避中的作用.
主要方法:
- RNA测序 (RNA-seq) 用于分析基因表达变化.
- 在细胞系中进行基因淘汰 (RIPK3 除) 和过度表达研究.
- 对STAT1酸化和干扰素刺激基因 (ISG) 表达的分析.
- 在RIPK3淘汰赛小鼠中进行的研究,以评估体内病毒清除和免疫反应.
主要成果:
- HTNV激活RIPK3,抑制STAT1酸化,从而阻碍干扰素反应.
- RIPK3 除增强了ISG表达,并显著限制了HTNV复制.
- 外源的RIPK3表达促进了HTNV复制,并损害了抗病毒防御.
- RIPK3淘汰赛小鼠表现出增强的先天免疫力和高效的HTNV清除.
结论:
- RIPK3在病毒感染中发挥着非正规的作用,使HTNV能够逃避宿主天生的免疫力.
- HTNV利用RIPK3抑制STAT1介导的抗病毒信号,代表了一种新的免疫逃避策略.
- 向RIPK3可能为管理HTNV感染提供治疗潜力.
相关概念视频
The JAK-STAT Signaling Pathway
9.0K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
9.0K
PI3K/mTOR/AKT Signaling Pathway
3.6K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.6K
Receptor Downregulation in MVBs
2.1K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.1K
NF-κB-dependent Signaling Pathway
7.5K
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.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
7.5K
MAPK Signaling Cascades
5.6K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.6K
Regulation of the Unfolded Protein Response
2.5K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.5K


