人类细胞巨乳病毒编码的pUS28通过准CIITA来对抗CD4+T细胞的识别
Fabienne Maassen1,2, Vu Thuy Khanh Le-Trilling1,3, Luisa Betke2
1Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
eLife
|July 3, 2025
概括
人类细胞巨血病毒 (HCMV) 使用其潜伏调节器pUS28来逃避免疫检测. 这种病毒蛋白抑制了人类白细胞抗原II类 (HLA-II) 的表达,阻止了CD4+T细胞的识别,特别是在免疫受损的个体中.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 人类细胞巨乳病毒 (HCMV) 是一种机会性病原体,对免疫系统疲软的个体产生重大影响.
- HCMV采用复杂的机制来逃避宿主免疫反应,包括抑制人类白细胞抗原 (HLA) 表达.
- 具体来说,HCMV干扰了HLAII类 (HLA-II) 分子的上调,例如HLA-DP和HLA-DR.
研究的目的:
- 确定参与对抗HLAII类分子表达的HCMV基因.
- 调查延迟调节器pUS28在调节HLA-IIII的II类交互激活器 (CIITA) 驱动表达中的作用.
- 阐明pUS28抑制HLA-II呈现和随后的T细胞识别的机制.
主要方法:
- 查HCMV基因与HLAII类诱导转录协调器的相互作用,CIITA.
- 同表达试验评估pUS28对CIITA介导的HLA-II组件表达 (CD74,HLA-DR,HLA-DM,HLA-DQ,HLA-DP) 的影响.
- 对pUS28突变 (wt-pUS28,R129A,C端缺失) 的分析,以确定参与CIITA对抗的功能域.
- 评估CD4+ T细胞对具有和没有pUS28表达的HCMV感染细胞的反应.
主要成果:
- 延迟调节器pUS28被确定为CIITA驱动的HLA-II表达的强有力的病毒对手.
- pUS28在转录后显著降低了CIITA蛋白的丰度,影响了CD74,HLA-DR,HLA-DM,HLA-DQ和HLA-DP.
- 野生类型的pUS28和与G蛋白结合的信号缺陷突变 (R129A) 均抑制了HLA-II表达,而C端删除突变则没有.
- pUS28表达有效地阻止了HCMV特异性CD4+T细胞诱导HLA-II和随后的免疫识别.
结论:
- 冠状病毒利用pUS28蛋白来积极抑制HLAII类表达.
- pUS28作为CIITA的转录后抗体,从而逃避CD4+ T细胞介导的免疫监测.
- 这种机制突出了免疫逃避的关键病毒战略,特别适用于HCMV在脆弱人群中的持久性和致病性.
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