title: Monoclonal antibody against a nuclear matrix antigen in proliferating human cells.
abstract: A monoclonal antibody of the IgG2a subclass was isolated from the supernate of a hybridoma line obtained with splenocytes from a mouse immunized with a crude nucleolar fraction of human Namalwa cells. This antibody identifies a single nuclear polypeptide antigen characterized by: (a) presence in proliferating human cell lines and phytohemagglutinin-stimulated lymphocytes, but absence in resting lymphocytes; (b) appearance in stimulated lymphocytes in parallel with the onset of DNA synthesis; (c) a speckled distribution in the nucleoplasm; (d) tight association with nuclear matrix structures identified by both biochemical and in situ extraction and enzyme treatment procedures; (e) mol wt of 125 kDa and pI 6.5 as determined by immunoprecipitation or immunoblotting of nuclear or nuclear matrix proteins fractionated by gel electrophoresis. The above characteristics identify the p125/6.5 nuclear matrix protein recognized by the isolated monoclonal antibody as belonging to the class of proliferating cell nuclear antigens.
mesh_terms: D000911:Antibodies, Monoclonal; D034961:Antigens, Nuclear; D001324:Autoantigens / Q000032:analysis*; D002455:Cell Division; D002460:Cell Line; D002467:Cell Nucleus / Q000276:immunology* / Q000648:ultrastructure; D005455:Fluorescent Antibody Technique; D006801:Humans; D007074:Immunoglobulin G; D009687:Nuclear Proteins / Q000032:analysis*; D010455:Peptides / Q000032:analysis / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D034961:Antigens, Nuclear; D001324:Autoantigens; D007074:Immunoglobulin G; D009687:Nuclear Proteins; D010455:Peptides