title: Th1 cytokine-conditioned bone marrow-derived dendritic cells can bypass the requirement for Th functions during the generation of CD8+ CTL.
abstract: Bone marrow-derived dendritic cell (BMDC) subsets have distinct immunoregulatory functions. Th1 cytokine-induced BMDC (BMDC1), compared with Th2 cytokine-induced BMDC2, have superior activities for the differentiation and expansion of CTL. To evaluate the cellular interactions between dendritic cells and CD8+ T cells for the induction of CTL, BALB/c-derived BMDC subsets were cocultured with purified CD8+ T cells from C57BL/6 mice. Our results demonstrate that BMDC1 support the generation of allogeneic CD8+ CTL in the absence of CD4+ Th cells. In contrast, BMDC0 (GM-CSF- plus IL-3-induced BMDC) and BMDC2 failed to promote the differentiation of CD8+ CTL. Using Ab-blocking experiments and studies with gene knockout mice, IL-2 and LFA-1 are demonstrated to be critical for BMDC1-induced CTL differentiation. Unexpectedly, BMDC1 were able to induce CTL from CD8+ T cells isolated from IFN-gamma-/- and IFN-gamma receptor-/- mice. However, BMDC1 produced higher levels of IFN-beta than other BMDC subsets, and anti-IFN-beta mAb blocked BMDC1-dependent CTL generation. These results indicated an indispensable role of IFN-beta, but not IFN-gamma, during BMDC1-induced CTL differentiation. We conclude that Th1-cytokine-conditioned BMDC1 can bypass Th cell function for the differentiation of naive CD8+ T cells into CTL.
authors.affiliation: Division of Immunoregulation, Institute for Genetic Medicine Hokkaido University, Sapporo 060-0815, Hokkaido, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Chamoto
authors.forename: T
authors.initials: T
authors.lastname: Tsuji
authors.forename: Y
authors.initials: Y
authors.lastname: Iwakura
authors.forename: Y
authors.initials: Y
authors.lastname: Togashi
authors.forename: T
authors.initials: T
authors.lastname: Koda
authors.forename: T
authors.initials: T
authors.lastname: Nishimura
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002478:Cells, Cultured; D016207:Cytokines / Q000494:pharmacology*; D003601:Cytotoxicity Tests, Immunologic; D003713:Dendritic Cells / Q000145:classification / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000276:immunology*; D016899:Interferon-beta / Q000235:genetics / Q000502:physiology; D007371:Interferon-gamma / Q000235:genetics / Q000502:physiology; D007376:Interleukin-2 / Q000502:physiology; D016169:Lymphocyte Function-Associated Antigen-1 / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D012333:RNA, Messenger / Q000096:biosynthesis; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology*
chemical_list: D016207:Cytokines; D007376:Interleukin-2; D016169:Lymphocyte Function-Associated Antigen-1; D012333:RNA, Messenger; D016899:Interferon-beta; D007371:Interferon-gamma