小细胞质dDNA和自之间的通信抑制了CGAS (循环GMP-AMP合成酶) 激活
Yu-Wei Luo1, Hongyu Ji1, Ai-Long Huang1
1Key Laboratory of Molecular Biology on Infectious Disease, Ministry of Education, Chongqing Medical University, Chongqing, P.R. China.
小细胞核DNA (scDNA) 抑制循环GMP-AMP合成酶 (CGAS) -STING1通路,通过阻断激活并通过自促成STING1降解. 这就产生了一个反循环,抑制了对较长DNA片段的先天免疫反应.
科学领域:
- 具有天生的免疫力.
- 分子生物学分子生物学
- 细胞信号传输 细胞信号传输
背景情况:
- 循环GMP-AMP合成酶 (CGAS) -STING1通路对先天免疫至关重要,检测长双链DNA (dsDNA) 引发炎症反应.
- 一个新发现的小细胞质dDNA (scDNA; ~20-40bp) 类别被发现会干扰这种途径.
研究的目的:
- 阐明scDNA抑制CGAS-STING1通路激活的机制.
- 研究自在scDNA和CGAS-STING1通路之间的相互作用中的作用.
主要方法:
- 研究了scDNA,CGAS和较长的dsDNA之间的结合相互作用.
- 在scDNA的存在下评估了CGAS的酶活性.
- 研究了scDNA对自和STING1和长dDNA的降解的影响.
主要成果:
- scDNA与CGAS结合,但未能激活其酶功能,从而抑制了该途径.
- 在CGAS结合方面,scDNA与较长的dsDNA竞争,阻止了正规通路的激活.
- scDNA诱导自,导致STING1和长dSDNA的降解,从而创建一个负反循环.
结论:
- scDNA作为CGAS-STING1先天免疫通路的负调节者.
- 自在调解scDNA对STING1和长dDNA的抑制作用方面发挥着关键作用.
- scDNA和自之间的相互作用为控制对dsDNA的先天免疫反应提供了一个新的机制.
更多相关视频
09:34The Lactate Dehydrogenase Sequestration Assay — A Simple and Reliable Method to Determine Bulk Autophagic Sequestration Activity in Mammalian Cells
Published on: July 27, 2018
09:10siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
Published on: October 28, 2019
相关概念视频
Autophagic Cell Death
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
Autophagy
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
The Extrinsic Apoptotic Pathway
The JAK-STAT Signaling Pathway
Delivery Pathways to the Lysosome
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Calmodulin-dependent Signaling
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
