Human cytomegalovirus microRNA miR-US4-1 inhibits CD8(+) T cell responses by targeting the aminopeptidase ERAP1.

Human cytomegalovirus microRNA miR-US4-1 inhibits CD8(+) T cell responses by targeting the aminopeptidase ERAP1.
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DOI:
10.1038/ni.2097
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发表时间:
2011-09-04
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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主要组织相容性复合体(MHC)I类分子通过CD 8 + T细胞在细胞表面上呈递肽,这对于杀死病毒感染或转化的细胞至关重要。MHC I类呈递肽的前体被内质网氨肽酶1(ERAP 1)修整为成熟表位。人巨细胞病毒(HCMV)的US 2-US 11基因组区域对于病毒复制来说是不可或缺的,并含有3种微小RNA(miRNA)。我们在这里显示HCMV miR-US 4 -1在病毒感染期间特异性下调ERAP 1表达。因此,HCMV衍生肽的修剪被抑制,导致感染细胞对HCMV特异性细胞毒性T淋巴细胞(CTL)的易感性降低。我们的研究结果揭示了一种新的基于病毒miRNA的CTL逃避机制,该机制靶向MHC I类抗原加工途径中的关键步骤。
The major histocompatibility complex (MHC) class I molecules present peptides on the cell surface by CD8+ T cells, which is critical for killing of virally infected or transformed cells. Precursors of MHC class I-presented peptides are trimmed to mature epitopes by endoplasmic reticulum aminopeptidase 1 (ERAP1). The US2-US11 genomic region of human cytomegalovirus (HCMV) is dispensable for viral replication and harbors 3 microRNAs (miRNAs). We show here the HCMV miR-US4-1 specifically down-regulates ERAP1 expression during viral infection. Accordingly, the trimming of HCMV-derived peptides is inhibited, leading to reduced susceptibility of infected cells to HCMV-specific cytotoxic T lymphocytes (CTLs). Our findings reveal a novel viral miRNA-based CTL evasion mechanism that targets a key step in the MHC class I antigen-processing pathway.
HCMV基因产品US11和US2在攻击鼠类主要组织相容性复合物(MHC)I类重链的等位基因形式的能力方面有所不同。
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