细胞毒性淋巴细胞抵消病毒型I干扰,免疫逃避
Michael Y Schakelaar1, Liling Shan1, Shuang Li1
1Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands.
PLoS pathogens
|February 9, 2026
概括
自然杀手 (NK) 细胞使用Granzyme M (GrM) 来克服人类细胞巨病毒 (HCMV) 的免疫逃避. 病毒pp71的GrM处理恢复了宿主.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 细胞生物学 细胞生物学
背景情况:
- 天生的免疫通过循环GMP-AMP合成酶 (cGAS) 和干扰素基因刺激器 (STING) 途径识别病毒核酸.
- 许多病毒,包括人类细胞巨乳病毒 (HCMV),具有逃避这种cGAS-STING介导的干扰素-β (IFN-β) 反应的机制.
- 了解病毒免疫逃避和宿主对抗机制对于开发抗病毒策略至关重要.
研究的目的:
- 研究自然杀手 (NK) 细胞在抵消HCMV逃避I型干扰素反应中的作用.
- 阐明NK细胞在HCMV感染期间恢复抗病毒免疫力的分子机制.
主要方法:
- 在HCMV感染的细胞与野生类型,穿孔素淘汰和Granzyme M (GrM) 淘汰NK细胞中IFN-β反应的比较分析.
- 研究NK细胞衍生的GrM与病毒pp71蛋白之间的相互作用.
- 评估GrM对pp71裂变对cGAS-STING通路激活和IFN-β产生的影响.
主要成果:
- 与淘汰NK细胞相比,NK细胞在HCMV感染细胞中显著增强IFN-β反应.
- 大酶M (GrM) 将病毒pp71蛋白切成两个片段.
- 由GrM裂变产生的第二个pp71片段增加了IFN-β的产生并克服了STING抑制,而第一片段被迅速降解.
结论:
- NK细胞利用Granzyme M (GrM) 作为一个关键机制,以抵消HCMV诱导的免疫逃避.
- 病毒pp71的GrM处理恢复了宿主的循环GMP-AMP合成酶 (cGAS) - - 干扰素基因 (STING) - - 干扰素β (IFN-β) - - 天生的免疫反应的刺激器.
- 准HCMV中的pp71分裂部位可能会损害NK细胞介导的免疫控制.
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