title: Retinoids act as multistep modulators of the major histocompatibility class I presentation pathway and sensitize neuroblastomas to cytotoxic lymphocytes.
abstract: The current therapeutic modalities achieve low response rates in human neuroblastoma, a frequent extracranial malignancy of the early childhood. We have assessed the effect of retinoids, used presently for the treatment of neuroblastoma, on the discrete steps of the MHC class I processing machinery and susceptibility of neuroblastoma cells to CTL-mediated killing. We demonstrate that retinoic acid derivatives induce the expression of proteolytic and regulatory subunits of the immunoproteasome, increase the half-life of MHC class I complexes, and enhance the sensitivity of neuroblastoma cells to both MHC class I-restricted peptide-specific and HLA nonrestricted lysis by CTLs. Importantly, effects of retinoids on the MHC class I pathway appear to be independent of IFN-gamma and/or TNF-alpha as intermediate messengers. To our knowledge, this is the first demonstration of inflammation-unrelated biological molecules that induce systemic modulation of antigen presentation in nonprofessional antigen presenting cells. Our findings suggest that the application of retinoids and T cell-based immunotherapy may be an effective combination for the treatment of neuroblastoma.
authors: Department of Oncology-Pathology, Karolinska Institutet, 17176 Stockholm, Sweden.
authors: Simona
authors: S
authors: Vertuani
authors: Anna
authors: A
authors: De Geer
authors: Victor
authors: V
authors: Levitsky
authors: Per
authors: P
authors: Kogner
authors: Rolf
authors: R
authors: Kiessling
authors: Jelena
authors: J
authors: Levitskaya
mesh_terms: D017951:Antigen Presentation / Q000187:drug effects* / Q000276:immunology; D000970:Antineoplastic Agents / Q000494:pharmacology*; D045744:Cell Line, Tumor; D003131:Combined Modality Therapy; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D006801:Humans; D016219:Immunotherapy, Adoptive / Q000379:methods*; D007371:Interferon-gamma / Q000276:immunology; D009447:Neuroblastoma / Q000276:immunology* / Q000628:therapy*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014212:Tretinoin / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology; D015854:Up-Regulation / Q000187:drug effects / Q000276:immunology
chemical_list: D000970:Antineoplastic Agents; D015395:Histocompatibility Antigens Class I; D014409:Tumor Necrosis Factor-alpha; D014212:Tretinoin; D007371:Interferon-gamma