Regulation of TNF-related apoptosis-inducing ligand on primary CD4+ T cells by HIV-1: role of type I IFN-producing plasmacytoid dendritic cells.
TNF-related apoptosis-inducing ligand (TRAIL), a member of the TNF superfamily, was suggested to contribute to HIV-1 pathogenesis by inducing CD4+ T cell death characteristic of AIDS. We previously reported HIV-1-mediated, TRAIL-induced apoptosis in primary CD4+ T cells in vitro and observed elevated levels of plasma TRAIL in HIV-1-infected patients. The present study elucidates the unresolved mechanism by which HIV-1 induces TRAIL expression on primary CD4+ T cells. We demonstrate that the expression of TRAIL by primary CD4+ T cells is regulated by IFN-alpha that is produced by HIV-1-stimulated plasmacytoid dendritic cells (pDCs). We also found that IFN-induced TRAIL is mediated by signal transducers and activators of transcription 1 and 2. We show that IFN-alpha production by HIV-1-activated pDCs is blocked by an early viral entry inhibitor of CD4-gp120 binding, but not by inhibitors of viral coreceptor binding. Our in vitro data are supported by the demonstration that anti-IFN-alpha and -beta Abs inhibit apoptosis and TRAIL expression in CD4+ T cells from HIV-1-infected patients. Our findings suggest a potential unique role of pDCs in the immunopathogenesis of HIV-1 infection by inducing the death molecule TRAIL.
Herbeuval
Jean-Philippe
JP
Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Hardy
Andrew W
AW
Boasso
Adriano
A
Anderson
Stephanie A
SA
Dolan
Matthew J
MJ
Dy
Michel
M
Shearer
Gene M
GM
D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000378:metabolism*; D015704:CD4 Antigens / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism / Q000821:virology; D015699:HIV Envelope Protein gp120 / Q000378:metabolism; D015658:HIV Infections / Q000276:immunology*; D015497:HIV-1 / Q000502:physiology*; D051539:Hepatocyte Nuclear Factor 1-beta / Q000378:metabolism; D006801:Humans; D007370:Interferon Type I / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D053221:TNF-Related Apoptosis-Inducing Ligand; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism*
D051017:Apoptosis Regulatory Proteins; D015704:CD4 Antigens; D015699:HIV Envelope Protein gp120; C496495:HNF1B protein, human; D007370:Interferon Type I; D008562:Membrane Glycoproteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; D051539:Hepatocyte Nuclear Factor 1-beta