Vaccinia virus A35R inhibits MHC class II antigen presentation.

Vaccinia virus A35R inhibits MHC class II antigen presentation.
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DOI:
10.1016/j.virol.2009.11.008
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发表时间:
2010-02-05
期刊:
影响因子:
3.7
通讯作者:
Roper RL
Roper RL
中科院分区:
医学3区
文献类型:
--
作者:
Rehm KE;Connor RF;Jones GJ;Yimbu K;Roper RL

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牛痘病毒基因A35R(Copenhagen命名)在嗜热型痘病毒中高度保守,是重要的毒力因子,但其功能尚不清楚。我们在此表明,A35不影响病毒的感染性,细胞凋亡诱导,或复制,但是,我们发现,A35显着抑制MHC II类限制性抗原呈递,T淋巴细胞的免疫启动,以及随后的趋化因子和细胞因子的合成。A35定位于内体,并减少了在II类MHC的裂缝中展示的模型抗原肽的量。此外,A35在体内降低VV特异性T细胞应答。因此,这是第一份鉴定A35蛋白在毒力中的功能的报告,也是第一份鉴定抑制肽抗原呈递的VV基因的报告。
The Vaccinia virus gene A35R (Copenhagen designation) is highly conserved in mammalian-tropic poxviruses and is an important virulence factor, but its function was unknown. We show herein that A35 does not affect viral infectivity, apoptosis induction, or replication; however, we found that A35 significantly inhibited MHC class II-restricted antigen presentation, immune priming of T lymphocytes, and subsequent chemokine and cytokine synthesis. A35 localized to endosomes and reduced the amount of a model antigenic peptide displayed in the cleft of class II MHC. In addition, A35 decreased VV specific T cell responses in vivo. Thus, this is the first report identifying a function for the A35 protein in virulence as well as the first report identifying a VV gene that inhibits peptide antigen presentation.
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发表时间: 1994-05-16
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