title: 1alpha,25-Dihydroxyvitamin D3 downmodulates the functional differentiation of Th1 cytokine-conditioned bone marrow-derived dendritic cells beneficial for cytotoxic T lymphocyte generation.
abstract: Various dendritic cell subsets are induced from bone marrow cells under different cytokine conditions. We have demonstrated previously that the Th1-cytokine-conditioned bone marrow-derived dendritic cell (BMDC) subset BMDC1 (generated in the presence of granulocyte-macrophage colony-stimulating factor [GM-CSF] + interleukin [IL]-3 + interferon [IFN]-gamma+ IL-12) induces a much stronger type 1 immune response than BMDC0 (GM-CSF + IL-3). In the present study, we investigated the effect of 1alpha,25-dihydroxyvitamine D3 (VitD3), which is a known immunomodulating drug, on the differentiation of BMDC subsets. The addition of VitD3 significantly influenced the functional differentiation of BMDC1 compared with BMDC0. Specifically, the addition of VitD3 greatly decreased the expression levels of MHC class I, CD80, CD40 and leukocyte function-associated antigen (LFA)-1 molecules on BMDC1. In addition, VitD3-treated BMDC1 (VD3-BMDC1) almost completely lost their immunostimulating activity for inducing type 1 immunity and cytotoxic T lymphocyte generation. A failure in the induction of type 1 immunity by VD3-BMDC1 appeared to be due to the following: (i) the expression of co-stimulatory molecules on VD3-BMDC1 was strongly downmodulated compared with BMDC1 generated without VitD3; and (ii) VD3-BMDC1 showed significantly lower mRNA expression of IFN-gamma and IFN-beta, factors that are essential for cytotoxic T lymphocyte induction. VitD3 inhibited the differentiation of functionally competent BMDC1 during the early phase of differentiation but not during the late differentiation period. A possible reason for the inhibition of BMDC1 differentiation by VitD3 is reduced phosphorylation of STAT1 during early differentiation. Taken together, VitD3 strongly suppressed T-cell responses by inhibiting functional differentiation of precursor dendritic cells into functional BMDC1 that are feasible for inducing Th1-dependent cellular immunity.
authors.affiliation: Division of Immunoregulation, Research Section of Disease Control, Institute for Genetic Medicine, Hokkaido University, N-15 W-7, Kita-ku, Sapporo 060-0815, Japan.
authors.forename: Junko
authors.initials: J
authors.lastname: Matsuzaki
authors.forename: Takemasa
authors.initials: T
authors.lastname: Tsuji
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
authors.forename: Daiko
authors.initials: D
authors.lastname: Wakita
authors.forename: Ikuo
authors.initials: I
authors.lastname: Imazeki
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Sakai
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ikeda
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishimura
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000276:immunology*; D002454:Cell Differentiation / Q000187:drug effects*; D002478:Cells, Cultured; D016207:Cytokines / Q000494:pharmacology*; D003601:Cytotoxicity Tests, Immunologic; D003713:Dendritic Cells / Q000276:immunology*; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism; D016899:Interferon-beta / Q000235:genetics / Q000378:metabolism; D007371:Interferon-gamma / Q000235:genetics / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010766:Phosphorylation; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D050794:STAT1 Transcription Factor / Q000378:metabolism; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D016207:Cytokines; D007376:Interleukin-2; D012333:RNA, Messenger; D050794:STAT1 Transcription Factor; C118756:dihydroxy-vitamin D3; D014807:Vitamin D; D016899:Interferon-beta; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor