title: In vitro growth inhibition of a broad spectrum of tumor cell lines by activated human dendritic cells.
abstract: Dendritic cells (DCs) are critical subsets of leukocytes providing antigen presentation for initiation of humoral and cellular immune responses. Their role as effector cells in tumor resistance, however, is less known. We report here that human DCs generated by culturing plastic-adherent peripheral blood monocytes in the presence of granulocyte-monocyte colony-stimulating factor (GM-CSF) and interleukin-4 have potent growth-inhibition activity in vitro on a wide spectrum of human tumor lines of different tissue origin. Proinflammatory stimuli lipopolysaccharide (LPS) and interferon-gamma, but not tumor necrosis factor-alpha and CD40 signaling, can further enhance DC-mediated inhibition of tumor growth. The growth inhibition requires contact between DCs and tumor cells while LPS treatment enhances the antitumor activity in DC culture supernatants. Our results suggest that in addition to their predominant role as regulatory cells, activated DCs are also potential effector cells in tumor immunity.
authors.affiliation: Department of Immunology, Mayo Graduate and Medical Schools, Mayo Clinic, Rochester, MN, USA.
authors.forename: A I
authors.initials: AI
authors.lastname: Chapoval
authors.forename: K
authors.initials: K
authors.lastname: Tamada
authors.forename: L
authors.initials: L
authors.lastname: Chen
mesh_terms: D002448:Cell Adhesion; D002450:Cell Communication; D002455:Cell Division; D002478:Cells, Cultured; D018920:Coculture Techniques; D003713:Dendritic Cells / Q000276:immunology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D007113:Immunity, Innate; D015847:Interleukin-4 / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D009000:Monocytes / Q000166:cytology / Q000276:immunology; D009369:Neoplasms / Q000276:immunology* / Q000473:pathology*; D010969:Plastics; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology
chemical_list: D006684:HLA-DR Antigens; D008070:Lipopolysaccharides; D010969:Plastics; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4; D016178:Granulocyte-Macrophage Colony-Stimulating Factor