一个特定于人类的基因在HIV-1感染后促进了CARD8炎症酶激活
Jessie Kulsuptrakul1, Elizabeth A Turcotte2, Michael Emerman3
1Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, United States.
eLife
|July 7, 2023
概括
人类CARD8炎症酶传感器通过识别HIV蛋白酶分裂来检测HIV-1感染. 这触发了热和细胞因子的释放,揭示了一个新的lentiviral防御机制.
科学领域:
- 这是天生的免疫力.
- 分子和细胞生物学分子和细胞生物学
- 病毒学 病毒学
背景情况:
- 炎症体是关键的细胞质先天免疫复合体,能够感知病原体的线索.
- 它们在宿主防御和炎症性疾病中起着关键作用.
- CARD8是一种参与免疫反应的人类炎症酶传感器.
研究的目的:
- 研究CARD8在检测HIV-1感染中的作用.
- 为了阐明HIV-1接触CARD8.8的机制.
- 探索CARD8-HIV-1蛋白酶相互作用的进化影响.
主要方法:
- 特定部位的切割试验以确定CARD8对HIV-1蛋白酶的敏感性.
- 在HIV-1感染后对热细胞死亡和细胞因子释放的分析.
- 跨物种的CARD8序列的进化分析.
主要成果:
- 人类CARD8的N端被HIV-1蛋白酶 (HIV-1PR) 特定地切割.
- 通过HIV-1PR介导的CARD8的裂变诱导热和促炎性细胞因子的释放.
- 进化分析表明,人类CARD8中的HIV-1PR分裂部位是最近人类特异性的适应.
- 来自黑猩猩的类似免疫缺陷病毒 (SIVcpz) 可以分裂人类的CARD8,这表明它已经适应了跨物种传播.
结论:
- 通过直接识别HIV-1蛋白酶活性,CARD8作为HIV-1感染的传感器.
- CARD8炎症酶的激活有助于宿主防御对病毒感染.
- 这些发现突出了人类CARD8和lentiviral蛋白酶之间独特的进化相互作用.
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