Abstract:
:Many viruses induce type I interferon responses by activating cytoplasmic RNA sensors, including the RIG-I-like receptors (RLRs). Although two members of the RLR family, RIG-I and MDA5, have been implicated in host control of virus infection, the relative role of each RLR in restricting pathogenesis in vivo remains unclear. Recent studies have demonstrated that MAVS, the adaptor central to RLR signaling, is required to trigger innate immune defenses and program adaptive immune responses, which together restrict West Nile virus (WNV) infection in vivo. In this study, we examined the specific contribution of MDA5 in controlling WNV in animals. MDA5(-/-) mice exhibited enhanced susceptibility, as characterized by reduced survival and elevated viral burden in the central nervous system (CNS) at late times after infection, even though small effects on systemic type I interferon response or viral replication were observed in peripheral tissues. Intracranial inoculation studies and infection experiments with primary neurons ex vivo revealed that an absence of MDA5 did not impact viral infection in neurons directly. Rather, subtle defects were observed in CNS-specific CD8(+) T cells in MDA5(-/-) mice. Adoptive transfer into recipient MDA5(+/+) mice established that a non-cell-autonomous deficiency of MDA5 was associated with functional defects in CD8(+) T cells, which resulted in a failure to clear WNV efficiently from CNS tissues. Our studies suggest that MDA5 in the immune priming environment shapes optimal CD8(+) T cell activation and subsequent clearance of WNV from the CNS.
journal_name
J Viroljournal_title
Journal of virologyauthors
Lazear HM,Pinto AK,Ramos HJ,Vick SC,Shrestha B,Suthar MS,Gale M Jr,Diamond MSdoi
10.1128/JVI.01403-13subject
Has Abstractpub_date
2013-11-01 00:00:00pages
11401-15issue
21eissn
0022-538Xissn
1098-5514pii
JVI.01403-13journal_volume
87pub_type
杂志文章abstract::Here, we report a novel porcine circovirus type 2a (PCV2a) strain with 11 nucleotides (nt) inserted in the origin of genome replication (Ori). This is the first report of a PCV2a strain with nucleotide insertion in Ori. Our study will help further epidemiological studies and extend our knowledge of evolutionary charac...
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pub_type: 杂志文章
doi:10.1128/JVI.63.12.5194-5200.1989
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pub_type: 杂志文章
doi:10.1128/JVI.64.10.4703-4708.1990
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doi:10.1128/JVI.7.3.352-358.1971
更新日期:1971-03-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.3.2398-2405.1998
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.55.1.60-66.1985
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journal_title:Journal of virology
pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.66.6.3602-3608.1992
更新日期:1992-06-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JVI.66.12.7452-7460.1992
更新日期:1992-12-01 00:00:00
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journal_title:Journal of virology
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更新日期:1967-06-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:1989-01-01 00:00:00
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