title: Immunostimulatory properties of human dendritic cells generated using IFN-beta associated either with IL-3 or GM-CSF.
abstract: Despite limited clinical efficacy in large trials, dendritic cells (DC)-based immunization has yielded impressive responses in some patients. Key questions remain to be solved in order to optimize this therapeutic vaccine. Among them, the nature of the DC type used and its state of maturation are pivotal. Besides myeloid DC which are mostly used in clinical trials, a new DC type has been recently described resulting from the differentiation of monocytes in the presence of type I IFNs. In the present study, we analyze the features of type I IFNs DC generated in the presence of either IL-3 (IL-3-DC) or GM-CSF (GM-CSF-DC) and compare their capacity to respond to poly(I:C) and to subsequently trigger T-cell activation. The two DC types disclose a similar immunophenotype characterized by high levels of chemokines receptors, co-stimulatory and HLA molecules expression. After poly(I:C) maturation, both DC types display a marked upregulation of CD80, CD83 and CD86 and the same pattern of gene expression. In addition, poly(I:C) stimulated them to secrete IFN-alpha and IL-12p70. Both DC types elicit potent allogeneic reactions. Priming of autologous T cells by IL-3-DC or GM-CSF-DC pulsed with an HLA-A2 restricted melan-A derived peptide, lead to the expansion of peptide specific CTL secreting high amounts of IFN-gamma. We conclude that poly(I:C) matured IL-3-DC and GM-CSF-DC share similar phenotype and functional properties including the capacity to prime tumor-associated antigen specific CTL.
authors.affiliation: Cellular and Molecular Therapy Unit, Erasme Hospital, 808 route de Lennik, 1070 Brussels, Belgium.
authors.forename: Naïma
authors.initials: N
authors.lastname: Mazouz
authors.forename: Olivier
authors.initials: O
authors.lastname: Detournay
authors.forename: Christel
authors.initials: C
authors.lastname: Buelens
authors.forename: Joëlle
authors.initials: J
authors.lastname: Renneson
authors.forename: Myrto
authors.initials: M
authors.lastname: Trakatelli
authors.forename: Micheline
authors.initials: M
authors.lastname: Lambermont
authors.forename: Michel
authors.initials: M
authors.lastname: Goldman
authors.forename: Michel
authors.initials: M
authors.lastname: Toungouz
mesh_terms: D000951:Antigens, Neoplasm; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D020869:Gene Expression Profiling; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000276:immunology*; D006801:Humans; D016130:Immunophenotyping; D007369:Interferon Inducers / Q000494:pharmacology; D016899:Interferon-beta / Q000276:immunology*; D007371:Interferon-gamma / Q000276:immunology; D018664:Interleukin-12; D007377:Interleukin-3 / Q000276:immunology*; D008213:Lymphocyte Activation; D058965:MART-1 Antigen; D046228:Microarray Analysis; D009363:Neoplasm Proteins; D011070:Poly I-C / Q000494:pharmacology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm; D007369:Interferon Inducers; D007377:Interleukin-3; D058965:MART-1 Antigen; C548667:MLANA protein, human; D009363:Neoplasm Proteins; D018664:Interleukin-12; D016899:Interferon-beta; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D011070:Poly I-C