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• W2155233940 abstract "Abstract Recent evidence demonstrates that HIV-1 infection leads to the attenuation of cellular immune responses, which has been correlated with the increased expression of programmed death (PD)-1 on virus-specific CD8+ T cells. PD-1 is induced upon T cell activation, and its prolonged expression facilitates CD8+ T cell inhibitory signals when bound to its B7 family ligands, PD-ligand (L)1/2, which are expressed on APCs. Importantly, early reports demonstrated that blockade of the PD-1/PD-L interaction by Abs may help to counter the development of immune exhaustion driven by HIV viral persistence. To better understand the regulation of the PD-1 pathway during HIV infection, we examined the ability of the virus to induce PD-L expression on macrophages and dendritic cells. We found a direct relationship between the infection of APCs and the expression of PD-L1 in which virus-mediated upregulation induced a state of nonresponsiveness in uninfected HIV-specific T cells. Furthermore, this exhaustion phenotype was revitalized by the blockade of PD-L1, after which T cells regained their capacity for proliferation and the secretion of proinflammatory cytokines IFN-γ, IL-2, and IL-12 upon restimulation. In addition, we identify a critical role for the PI3K/serine–threonine kinase signaling pathway in PD-L1 upregulation of APCs by HIV, because inhibition of these intracellular signal transducer enzymes significantly reduced PD-L1 induction by infection. These data identify a novel mechanism by which HIV exploits the immunosuppressive PD-1 pathway and suggest a new role for virus-infected cells in the local corruption of immune responses required for viral suppression." @default.
• W2155233940 created "2016-06-24" @default.
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• W2155233940 date "2011-09-15" @default.
• W2155233940 modified "2023-10-02" @default.
• W2155233940 title "HIV-Mediated Phosphatidylinositol 3-Kinase/Serine–Threonine Kinase Activation in APCs Leads to Programmed Death-1 Ligand Upregulation and Suppression of HIV-Specific CD8 T Cells" @default.
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• W2155233940 doi "https://doi.org/10.4049/jimmunol.1100594" @default.
• W2155233940 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3197696" @default.
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