title: Immunochemical analysis of the modulation of human melanoma-associated antigens by DNA recombinant immune interferon.
abstract: By utilizing the human melanoma cell line Colo 38, a panel of monoclonal antibodies, and a combination of serologic and immunochemical assays, the effect of recombinant immune interferon (IFN-gamma) on the synthesis, expression, and shedding of a cytoplasmic melanoma-associated antigen (MAA) and of the membrane-bound high m.w. MAA (HMW-MAA), 115K MAA, and 100K MAA has been investigated. IFN-gamma increased the synthesis and shedding of the cytoplasmic MAA, but reduced the synthesis and cell surface expression of the HMW-MAA and of the 100K MAA. The cell surface expression of the 115K MAA on IFN-gamma-treated melanoma cells was reduced, although its synthesis was not markedly changed. The effects were dose-dependent and were related to the incubation time of cells with IFN-gamma. Among the three membrane-bound MAA analyzed, the 100K MAA was the most susceptible to modulation by IFN-gamma. The effects of IFN-gamma preparations are not mediated by contaminants in IFN-gamma preparations because removal of IFN-gamma by affinity chromatography on anti-IFN-gamma monoclonal antibodies abolished its modulating activity. The effects of IFN-gamma on the cytoplasmic MAA are similar to those of leukocyte and fibroblast interferons, whereas those on the membrane-bound MAA are significantly different. The potential implications of the marked changes in the antigenic profile of melanoma cells treated with IFN-gamma are discussed in view of the changes in the immunogenicity of IFN-gamma-treated melanoma cells.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology; D002460:Cell Line; D004274:DNA, Recombinant; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D007700:Kinetics; D008213:Lymphocyte Activation; D008543:Melanins / Q000096:biosynthesis; D008545:Melanoma / Q000276:immunology* / Q000378:metabolism; D058950:Melanoma-Specific Antigens; D051379:Mice; D009363:Neoplasm Proteins / Q000032:analysis* / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D004274:DNA, Recombinant; D008543:Melanins; D058950:Melanoma-Specific Antigens; D009363:Neoplasm Proteins; D007371:Interferon-gamma