卡波西的肉瘤相关性疹病毒 (KSHV) LANA 阻止了 KSHV 发作退化
Ken-Ichi Nakajima1, Tomoki Inagaki1, Jonna Magdallene Espera1
1Department of Dermatology, School of Medicine, University of California Davis, Sacramento, California, USA.
Journal of virology
|January 19, 2024
概括
卡波西的肉瘤相关性疹病毒 (KSHV) 延迟相关核抗原 (LANA) 枯竭导致病毒DNA通过先天免疫传感快速损失. 拉纳防止病毒基因组被cGAS-STING和自途径检测,保持KSHV的延迟.
科学领域:
- 分子病毒学分子病毒学
- 细胞免疫学 细胞免疫学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 卡波西的肉瘤相关性疹病毒 (KSHV) 导致终身潜伏感染.
- 与延迟相关的核抗原 (LANA) 对于在延迟期间保持KSHV插曲性DNA至关重要.
- 了解LANA在病毒基因组维护和免疫逃避中的作用,对于KSHV病变发生至关重要.
研究的目的:
- 通过诱导性降解系统,研究KSHV LANA在病毒延迟和Lytic基因表达中的功能.
- 为了阐明在LANA枯竭时病毒基因组DNA损失背后的机制.
- 确定LANA在逃避宿主天生的免疫反应中的作用.
主要方法:
- 利用辅酶诱导降解 (AID) 系统,在KSHV感染的iSLK细胞中实现mAID标记的LANA的快速,可诱导的淘汰.
- 在LANA枯竭和激发重新激活时评估病毒的性基因表达.
- 量化了KSHV基因组DNA水平,并调查了先天免疫传感器 (cGAS,STING) 和自途径的参与.
主要成果:
- 诱导性耗尽LANA在1.5小时内迅速降解了蛋白质.
- LANA 枯竭并没有诱导lytic 反激活,但降低了可诱导的lytic 基因表达.
- LANA的耗尽导致了KSHV基因组的快速降解,由cGAS-STING信号传递和自介导,由克洛洛昆阻断,并通过siRNA敲击cGAS/STING来挽救.
结论:
- LANA 积极防止 KSHV 基因组 DNA 被宿主的天生的免疫系统感知,特别是 cGAS-STING 途径.
- 在LANA枯竭后病毒基因组的损失与先天免疫感应和自途径有关.
- 这些发现揭示了LANA在通过保护病毒发作不受免疫监测而维持KSHV延迟的新机制.
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