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• W2929685767 abstract "Abstract CD4 T cell activation is critical to the initiation of adaptive immunity. CD4 T cells are also the main targets of HIV infection, and their activation status contributes to the maintenance and outcome of infection. Although the role of activation in the differentiation and proliferation of CD4 T cells is well studied, its impact on the processing and MHC class I (MHC-I) presentation of epitopes and immune recognition by CD8 T cells are not investigated. In this study, we show that the expression and hydrolytic activities of cellular peptidases are increased upon TCR-dependent and MHC–peptide activation of primary CD4 T cells from healthy or HIV-infected persons. Changes in peptidase activities altered the degradation patterns of HIV Ags analyzed by mass spectrometry, modifying the amount of MHC-I epitopes produced, the antigenicity of the degradation products, and the coverage of Ags by degradation peptides presentable by MHC-I. The computational analysis of 2237 degradation peptides generated during the degradation of various HIV-antigenic fragments in CD4 T cells identified cleavage sites that were predictably enhanced, reduced, or unchanged upon cellular activation. Epitope processing and presentation by CD4 T cells may be modulated by the activation state of cells in a sequence-dependent manner. Accordingly, cellular activation modified endogenous Ag processing and presentation and killing of HIV-infected CD4 T cells by CD8 T cells in a way that mirrored differences in in vitro epitope processing. The clearance of HIV-infected cells may rely on different immune responses according to activation state during HIV infection." @default.
• W2929685767 created "2019-04-11" @default.
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• W2929685767 date "2019-05-15" @default.
• W2929685767 modified "2023-09-30" @default.
• W2929685767 title "The Activation State of CD4 T Cells Alters Cellular Peptidase Activities, HIV Antigen Processing, and MHC Class I Presentation in a Sequence-Dependent Manner" @default.
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• W2929685767 doi "https://doi.org/10.4049/jimmunol.1700950" @default.
• W2929685767 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6504579" @default.
• W2929685767 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30936293" @default.
• W2929685767 hasPublicationYear "2019" @default.
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