一个病毒编码的IPS-1同类在KSHV的Lytic复制过程中调节先天免疫信号
bioRxiv : the preprint server for biology
|August 30, 2024
概括
卡波西的肉瘤相关性疹病毒 (KSHV) 编码了一种新型蛋白质,病毒-IPS-1 (v-IPS-1),它破坏了I型干扰素信号传递. 这种病毒蛋白损害了宿主对KSHV感染的天生的免疫反应.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 天生的免疫力对于控制病毒感染至关重要.
- 病毒通常编码蛋白质来逃避宿主免疫反应,特别是I型干扰素 (IFN).
- 众所周知,卡波西的肉瘤相关性疹病毒 (KSHV) 具有免疫逃避策略.
研究的目的:
- 识别和描述参与免疫调节的新型KSHV编码蛋白质.
- 研究KSHV干扰I型IFN诱导的机制.
- 了解病毒-IPS-1在KSHV病变发生中的作用.
主要方法:
- 对KSHV基因组的生物信息分析,以确定开放的阅读框架.
- 在KSHV光学复制过程中对病毒蛋白的表达分析.
- 使用记者系统进行干扰素诱导测定.
- 西部斑点分析以评估蛋白质稳定性和信号通路激活.
- 抗病毒反应测定.
主要成果:
- 发现了一种编码病毒IPS-1 (v-IPS-1) 的新KSHV基因,该基因是人类IPS-1 (也称为MAVS) 的同类.
- 在KSHV光学复制期间的v-IPS-1表达阻断了TRAF3上游的I型IFN诱导,影响了RLR和TLR3/4信号.
- v-IPS-1 破坏细胞IPS-1 和TRIF的稳定,同时稳定TRAF3.
- 对v-IPS-1的表达导致抗病毒反应减少.
结论:
- v-IPS-1是IPS-1的第一个已识别的病毒同源.
- v-IPS-1 通过调节 KSHV 临床复制过程中的 I 型 IFN 信号,有效地重新编程先天免疫.
- v-IPS-1通过抑制宿主抗病毒防御来促进KSHV的致病性.
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