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• W2057490258 abstract "Hepatitis C virus (HCV) has a high rate of replication and lacks RNA-proofreading capabilities, thereby leading to variant or mutant viruses circulating within the host as a quasispecies. Previous work in our laboratory identified viral variants that emerged in a class-II immunodominant epitope NS3(358-375) of the non-structural-3 (NS3) protein region of HCV, the sequence of which is based on genotype 1A, the most prevalent genotype in the United States. Further work suggested that positive immune selection pressure was driving viral variation. Paradoxically, viral variants account for only a small percentage of the circulating virus in human beings and in chimpanzees, suggesting that passive evasion is not the only means of escape by HCV. This observation suggests a unique pathogenesis for HCV as it persists in the host. In the current study, we hypothesize that viral variants are acting as altered peptide ligands (APLs). To test this hypothesis, we used cloned T cells specific for NS3(358-375) peptide, which demonstrated attenuated T-cell and interferon-γ (IFN-γ) responses to individual variant peptides, when compared with the NS3(358-375) stimulated T-cell clones. Furthermore, such variants could act as APLs, based on their ability to antagonize the IFN-γ proliferative responses of clones specific for NS3(358-375). In addition, major histocompatibility complex (MHC) class II tetramer staining demonstrated that variant peptide-MHC complexes were able to specifically bind to NS3(358-375) T-cell clones and that both the variant and NS3(358-375) tetramers were able to bind to the same CD4(+) T cells. Taken together, the results suggest that viral variants may act as APL to effectively blunt the T-cell response to an important HCV epitope." @default.
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• W2057490258 date "2011-05-01" @default.
• W2057490258 modified "2023-09-26" @default.
• W2057490258 title "Naturally occurring CD4+ T-cell epitope variants act as altered peptide ligands leading to impaired helper T-cell responses in hepatitis C virus infection" @default.
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• W2057490258 doi "https://doi.org/10.1016/j.humimm.2011.02.010" @default.
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