title: T-cell-conditioned medium efficiently induces the maturation and function of human dendritic cells.
abstract: We present evidence that T-cell-conditioned media (TCCM) can efficiently induce human immature dendritic cells (DC) to express high levels of immune accessory molecules commonly found on mature DC. TCCM prepared from cell-free supernatants of anti-CD3-activated T cells contained several soluble factors including CD40-ligand (sCD40L), TNF-alpha, and IFN-gamma. In contrast to moderate up-regulation of costimulatory molecules by the addition of individual cytokines or monocyte-conditioned medium, treatment of immature DC with TCCM induced a marked increase in the expression of costimulatory molecules in a dose-dependent manner. The ability of TCCM to induce such phenotypic changes could be abrogated by neutralizing antibodies specific for CD40L, TNF-alpha, and IFN-gamma, indicating that these factors present in TCCM are mainly implicated in the maturation of DC. Importantly, TCCM-treated DC can produce significantly higher levels of IL-12 and are highly effective stimulators in allogenenic and autologous mixed-lymphocyte reactions. Overall, these findings show that cultivation with TCCM is an efficient approach for the induction of mature DC that should be useful in eliciting antigen-specific immune responses against cancer and viruses.
authors.affiliation: Pharmacology Division, National Cancer Center Research Institute, Tokyo, Japan. kakato@gan2.ncc.go.jp
authors.forename: K
authors.initials: K
authors.lastname: Kato
authors.forename: Y
authors.initials: Y
authors.lastname: Takaue
authors.forename: H
authors.initials: H
authors.lastname: Wakasugi
mesh_terms: D017951:Antigen Presentation; D017252:CD3 Complex / Q000276:immunology; D023201:CD40 Ligand / Q000276:immunology; D002450:Cell Communication / Q000276:immunology*; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D017077:Culture Media, Conditioned / Q000494:pharmacology; D003713:Dendritic Cells / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
chemical_list: D017252:CD3 Complex; D017077:Culture Media, Conditioned; D014409:Tumor Necrosis Factor-alpha; D023201:CD40 Ligand; D007371:Interferon-gamma