title: Cultured human epidermal cells do not synthesize HLA-DR.
abstract: All nucleated cells express HLA-A, B, and C antigens. However, only a few cells, including epidermal cells, demonstrate HLA-DR antigens which are potent transplantation immunogens in man. The current study was undertaken to determine if epidermal cell continue to synthesize and/or express HLA-DR antigens after prolonged in vitro culture. Epidermal cells cultured for 7 days or more no longer stimulated allogeneic lymphocytes in the epidermal cell-lymphocyte reaction. Indirect immunofluorescence light microscopy of cultured cells using mouse monoclonal antibody to HLA-DR antigen confirmed that these cells do not express HLA-DR antigens whereas they retain beta 2-microglobulin. Detergent extracts of 12-day cultured epidermal cells biosynthetically labeled with 35 S-methionine were immunoprecipitated with monoclonal anti-DR antibody and analyzed by the method of two-dimensional polyacrylamide gel electrophoresis. No radiolabeled proteins were found on these gels in the regions where HLA-DR molecules are known to migrate. These data indicate that HLA-DR antigen is absent from cultured epidermal cells. Finally, we describe a technique for growing epidermal cells on a gelatin membrane which allows subsequent removal of intact cell monolayers from the culture dish. Such monolayers may be useful for purposes of transplantation.
mesh_terms: D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D007801:Langerhans Cells / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008567:Membranes, Artificial; D011961:Receptors, Fc / Q000032:analysis; D012867:Skin / Q000276:immunology* / Q000648:ultrastructure
chemical_list: D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D008567:Membranes, Artificial; D011961:Receptors, Fc