title: Monoclonal antibodies to a nuclear protein (PCNA/cyclin) associated with DNA replication.
abstract: Two hybridomas producing monoclonal antibodies to proliferating cell nuclear antigen. (PNCA)/cyclin were generated from spleen cells of BALB/c mice immunized with purified PCNA from rabbit thymus. The specificity of the monoclonal antibodies (19A2 and 19F4) was established by showing that they reacted in enzyme-linked immunosorbent assay (ELISA) with purified PCNA. Furthermore, they reacted in one-dimensional (ID) gel immunoblots with a 36 kD polypeptide which also reacted with human autoantibodies from lupus patients. Both monoclonals also recognized the nuclear polypeptide cyclin in two-dimensional (2D) gel immunoblots of HeLa cell proteins. Epitopes recognized by 19A2 and 19F4 were analysed by competitive inhibition test using a modified ELISA. The data suggested that the epitopes were closely related, but not identical. The data with human auto-antibodies were more difficult to interpret, although it suggested that some human anti-PCNA may share epitopes with 19A2 and 19F4, but in addition recognize different epitopes on the PCNA molecule.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D004261:DNA Replication; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005455:Fluorescent Antibody Technique; D006367:HeLa Cells / Q000032:analysis; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D009698:Nucleoproteins / Q000032:analysis*; D018809:Proliferating Cell Nuclear Antigen; D011817:Rabbits; D013950:Thymus Gland / Q000032:analysis
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D009698:Nucleoproteins; D018809:Proliferating Cell Nuclear Antigen