title: CD8+ T-cells suppress antigen-specific and allogeneic CD4+ T-cell responses to herpes simplex virus type 2-infected human dendritic cells.
abstract: In this study we show that human dendritic cells (DC), productively infected with herpes simplex virus type 2 (HSV-2), activate CD8+ T cells that suppress antigen-specific and alloreactive CD4+ T cell expansion. Addition of CD8+ T cells to cultures of DC and CD4+ T cells blocked CD4+ T-cell proliferation in response to HSV-2-infected but not to uninfected DC. The effect was independent of prior HSV exposure or cognate MHC class I-restricted CD8-DC recognition as it was induced in CD8+ T cells from HSV-2-seronegative individuals and in mixed lymphocyte reactions using allogeneic DC. Both CD8+ CD25+ and CD8+ CD25- cells were shown to have suppressive capacities. The blood-derived CD25+ CD8+ T cells did not express Foxp3 mRNA but had a bona fide antiproliferative capacity in response to both uninfected and HSV-2-infected DC, whereas the CD25-CD8+ T cells were selectively activated to become antiproliferative by HSV-2-infected DC. These data imply that HSV infection of DC could modulate the immune response by activating CD8+ T cells.
authors.affiliation: Department of Rheumatology and Inflammation Research, University of Göteborg, Göteborg, Sweden.
authors.forename: Inger
authors.initials: I
authors.lastname: Nordström
authors.forename: Merja
authors.initials: M
authors.lastname: Nurkkala
authors.forename: L Vincent
authors.initials: LV
authors.lastname: Collins
authors.forename: Kristina
authors.initials: K
authors.lastname: Eriksson
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D049109:Cell Proliferation; D002478:Cells, Cultured; D016207:Cytokines / Q000032:analysis; D003713:Dendritic Cells / Q000276:immunology* / Q000821:virology*; D051858:Forkhead Transcription Factors / Q000235:genetics; D015870:Gene Expression; D018258:Herpesvirus 2, Human / Q000276:immunology*; D006801:Humans; D008213:Lymphocyte Activation; D012333:RNA, Messenger / Q000032:analysis; D015375:Receptors, Interleukin-2 / Q000032:analysis; D016176:T-Lymphocyte Subsets / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D016207:Cytokines; C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D012333:RNA, Messenger; D015375:Receptors, Interleukin-2