title: Double fluorescence technique for measurement of complement-fixing antibody to lymphocyte subsets.
abstract: A double fluorescent antibody method for quantitating human complement-fixing antibody to lymphocyte subclasses has been developed. The indicators in this system are a C6-deficient serum as a non-lytic source of complement, rhodamine-labeled anti-C3 and fluorescein-labeled murine monoclonal antibodies to human lymphocyte subsets. The basic procedure is to incubate lymphocytes with the unknown serum and then to add C6-deficient serum. The binding of C3 is indicated by staining with rhodamine-labeled anti-C3 and the subset class of the lymphocyte so stained is determined by binding of fluorescein-tagged anti-OKT4 or -OKT8 antibodies. The occurrence of both red and green cell surface fluorescence denotes the presence of a complement-binding antibody to the lymphocyte subset defined by the monoclonal antibody. In addition to defining the specificity of complement-fixing anti-lymphocyte antibodies, this technique is more sensitive than the microcytotoxicity assay.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology; D000911:Antibodies, Monoclonal; D000920:Antibody-Dependent Cell Cytotoxicity; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000032:analysis; D003168:Complement Fixation Tests; D005455:Fluorescent Antibody Technique; D006801:Humans; D016030:Kidney Transplantation; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface