Linked Life Data

16496339

Source:http://linkedlifedata.com/resource/pubmed/id/16496339

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pubmed-article:16496339pubmed:abstractTextVirus-specific CD8+ T cell responses play an important role in the natural course of infection; however, the impact of certain CD8+ T cell responses in determining clinical outcome has not been fully defined. A well-defined cohort of women inoculated with HCV from a single source showed that HLA-B27 has a strong association with spontaneous clearance. The immunological basis for this association is unknown. However, the finding is especially significant because HLA-B27 has also been shown to have a protective role in HIV infection. We report the identification of an HLA-B27 restricted hepatitis C virus (HCV)-specific CD8+ T cell epitope that is recognized in the majority of recovered HLA-B27 positive women. In chronically HCV-infected individuals, analysis of the corresponding viral sequence showed a strong association between sequence variations within this epitope and expression of HLA-B27, indicating allele-specific selection pressure at the population level. Functional analysis in 3 chronically HCV-infected patients showed that the emerging variant viral epitopes represent escape mutations. In conclusion, our results suggest a dominant role of HLA-B27 in mediating spontaneous viral clearance as well as viral evolution in HCV infection and mechanistically link both associations to a dominant novel CD8+ T cell epitope. These results support the central role of virus-specific CD8+ T cells and the genetically determined restriction of the virus-specific T cell repertoire in HCV infection.lld:pubmed
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pubmed-article:16496339pubmed:articleTitleDominant influence of an HLA-B27 restricted CD8+ T cell response in mediating HCV clearance and evolution.lld:pubmed
pubmed-article:16496339pubmed:affiliationDepartment of Medicine II, University of Freiburg, Germany.lld:pubmed
pubmed-article:16496339pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16496339pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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