title: UVB-irradiated dendritic cells fail to tolerize murine CD8 naïve or effector T cells.
abstract: UVB radiation has been shown to induce T cell tolerance most likely via modulation of the function of antigen-presenting cells like dendritic cells (DC), which are therefore of interest for vaccination therapy. Since little is known about the effects of UVB-irradiated dendritic cells (UVB-DC) on CD8(+) T cells, which are the dominant effectors in various allergic and autoimmune diseases, we have investigated the potential of low dose UVB (100-200 J per m(2)) irradiated bone marrow-derived dendritic cells to induce tolerance in murine CD8(+) T cells specific for the contact allergen trinitrophenyl (TNP) or for a viral peptide. In contrast to the previously reported successful tolerization of primed CD4(+) Th1 cells, neither naïve CD8(+) T cells nor CD8(+) Tc1 effector cells or established CD8(+) T cell clones could be tolerized by TNP-modified or peptide-pulsed UVB-DC in vitro or in vivo. We observed, however, a reduced capacity of UVB-DC to prime naïve CD8(+) T cells. Our data demonstrate an important difference in the susceptibility of CD4(+) and CD8(+) T cells for tolerance induction using low-dose UVB-irradiated DC and have implications for DC therapy of CD8(+) T cell-mediated diseases.
authors.affiliation: Clinical Research Group Allergology, Department of Dermatology, University of Freiburg, Freiburg, Germany.
authors.forename: Jan C
authors.initials: JC
authors.lastname: Dudda
authors.forename: Ralf W
authors.initials: RW
authors.lastname: Denfeld
authors.forename: Jan C
authors.initials: JC
authors.lastname: Simon
authors.forename: Stefan F
authors.initials: SF
authors.lastname: Martin
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology* / Q000528:radiation effects*; D017449:Dermatitis, Allergic Contact / Q000209:etiology / Q000276:immunology; D000939:Epitopes; D007108:Immune Tolerance; D008024:Ligands; D051379:Mice; D008810:Mice, Inbred C57BL; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D014301:Trinitrobenzenes; D014466:Ultraviolet Rays
chemical_list: D000939:Epitopes; D008024:Ligands; D011948:Receptors, Antigen, T-Cell; D014301:Trinitrobenzenes