title: Interleukin-10-treated dendritic cells modulate immune responses of naive and sensitized T cells in vivo.
abstract: Interleukin-10 is a pleiotropic cytokine known to have inhibitory effects on the accessory functions of dendritic cells. In vitro, interleukin-10 converts immature dendritic cells into tolerizing antigen- presenting cells. To assess whether interleukin-10-treated dendritic cells exert tolerizing effects in vivo, CD4+ T cells from DO11.10 ovalbumin-T cell receptor transgenic mice were transferred to syngeneic BALB/c recipients. Recipient animals were treated with ovalbumin-pulsed/unpulsed, interleukin-10-treated/untreated CD11c+ dendritic cells thereafter and ovalbumin-specific proliferation of lymph node cells was assessed by restimulation with the peptide in vitro. In prophylactic experiments, recipients received naive CD4+ DO11.10 T cells and were immunized with ovalbumin323-339 peptide in incomplete Freund's adjuvant after treatment with various subtypes of dendritic cells. Strong ovalbumin-specific proliferation was observed in animals immunized with control ovalbumin-dendritic cells. Minimal proliferation was found in mice treated with ovalbumin-pulsed, interleukin-10-treated dendritic cells. In therapeutic experiments, preactivated CD4+ DO11.10 T cells were transferred, and recipients were treated with dendritic cells as described. Ovalbumin-specific proliferation was strong in recipients treated with ovalbumin-dendritic cells. CD4+ T cell proliferation from ovalbumin-interleukin-10-dendritic cell treated animals was below background. When delayed type hypersensitivity reactions in the footpads of prophylactically or therapeutically vaccinated animals were tested, mice treated with ovalbumin-interleukin-10-dendritic cells showed no footpad swelling compared with controls. Rechallenge with the antigen in vitro and in vivo did not alter the inhibitory effect of interleukin-10-treated dendritic cells. Thus, interleukin-10-treated dendritic cells inhibit ovalbumin-specific immune responses in naive and sensitized mice.
authors.affiliation: Department of Dermatology, University of Mainz, Mainz, Germany.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Müller
authors.forename: Anke
authors.initials: A
authors.lastname: Müller
authors.forename: Thomas
authors.initials: T
authors.lastname: Tüting
authors.forename: Kerstin
authors.initials: K
authors.lastname: Steinbrink
authors.forename: Joachim
authors.initials: J
authors.lastname: Saloga
authors.forename: Claudia
authors.initials: C
authors.lastname: Szalma
authors.forename: Jürgen
authors.initials: J
authors.lastname: Knop
authors.forename: Alexander H
authors.initials: AH
authors.lastname: Enk
mesh_terms: D000818:Animals; D003713:Dendritic Cells / Q000187:drug effects* / Q000502:physiology; D006968:Hypersensitivity, Delayed / Q000517:prevention & control; D016753:Interleukin-10 / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D011948:Receptors, Antigen, T-Cell; D016753:Interleukin-10; D010047:Ovalbumin