在HSV-1和HSV-2感染期间,抗原呈现分子MR1的多目标损失
Carolyn Samer1, Hamish E G McWilliam2,3, Brian P McSharry1,4
1Infection, Immunity and Inflammation, School of Medical Sciences, Faculty of Medicine and Health, and the Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia.
简单疹病毒 (HSV) 感染减少了主要组织相容性复合体 (MHC) 与I类相关的 (MR1) 分子,该分子向MAIT细胞呈现微生物代谢物. 病毒蛋白破坏MR1的表达,在感染期间逃避免疫检测.
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:
- 大型组织相容性复合体 (MHC) 类I相关 (MR1) 分子向粘膜关联不变T细胞 (MAIT) 呈现微生物代谢物.
- MAIT细胞对于粘膜部位的免疫监测至关重要,包括受疹简单病毒 (HSV) 感染影响的部位.
研究的目的:
- 研究HSV-1和HSV-2感染降低MR1表达的机制.
- 为了确定参与破坏MR1抗原呈现途径的特定病毒蛋白质.
主要方法:
- 在体外分析HSV-1和HSV-2感染期间MR1蛋白和转录水平.
- 研究特定的HSV编码蛋白质,包括独特的短3和感染细胞蛋白22 (ICP22) 在MR1调控中的作用.
- 评估MR1的贩运和退化途径.
主要成果:
- HSV-1感染导致MR1的快速丧失,部分由独特的短3蛋白介导,并通过转录降解进一步由病毒宿主关闭RNase蛋白降低.
- 感染细胞蛋白22 (ICP22) 通过蛋白质体的降解,在其贩运途径的早期降低MR1的调节,而不会影响经典的MHC-I分子.
- 同样,HSV-2感染会降低MR1转录和蛋白质水平,与HSV-1的影响相似.
结论:
- HSV使用多种病毒蛋白来破坏MR1-MAIT细胞通路,代表了一种多方面的免疫逃避策略.
- 这种病毒策略可以在初级感染和重新激活期间保护HSV感染的细胞免受MAIT细胞介导的免疫反应.
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