title: HLA-DR expression in a human colonic carcinoma cell line.
abstract: A human colonic carcinoma cell line (HCA-7) isolated from a well differentiated mucoid adenocarcinoma of the colon has been maintained in vitro for 3 years. It spontaneously synthesizes HLA-DR which is mainly intracytoplasmic. Stimulation with lymphocyte conditioned medium and recombinant gamma-interferon results in enhanced synthesis of HLA-DR and the appearance of the antigen on the cell surface. A dose response study showed that maximal stimulation of the culture was achieved with 50 units/ml of recombinant gamma-interferon. Staining for HLA-DR was uneven being confined to focal areas of the monolayer, which is similar to the focal expression of HLA-DR seen in sections of adenocarcinoma of the colon. The functional significance of this phenomenon is unclear, but it may explain the presence of lymphoid infiltrates in tumours.
mesh_terms: D000230:Adenocarcinoma / Q000276:immunology* / Q000473:pathology; D000911:Antibodies, Monoclonal / Q000276:immunology; D000937:Antigen-Antibody Reactions; D002460:Cell Line; D003110:Colonic Neoplasms / Q000276:immunology* / Q000473:pathology; D004305:Dose-Response Relationship, Drug; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D008214:Lymphocytes; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007371:Interferon-gamma