title: [Quantification of SS-B autoantibodies in patient sera using highly purified human SS-B antigens and their clinical interpretation].
abstract: For the identification of SS-B autoantibodies in the sera of patients with rheumatic diseases (n = 319) a sensitive and specific enzyme-linked immunosorbent assay was developed using highly purified human SS-B antigen as a reference antigen. In 30/319 patients' sera SS-B autoantibodies were detected. In this group, the ratio female : male patients was outstandingly high (29:1), the serum of the single male patient exhibiting the lowest titer of SS-B autoantibodies. The highest portion of anti-SS-B positive sera was observed in the group of patients with systemic Lupus erythematosus (48%) followed by the groups with undifferentiated connective tissue disease (17%), Sjögren-syndrome (13%) and rheumatoid arthritis (6%). The protein components reacting with human SS-B autoantibodies were characterized in permanent cell lines of various species. In each of 9 human cell lines only one component with a molecular weight of 49 kD reacted; in cell lines of other species analogously, only one component reacted, showing slightly different molecular weights depending on the species. The SS-B antigen isolated from human cells contained at least 7 isoelectric variants, all reacting with human SS-B autoantibodies.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology; D001323:Autoantibodies / Q000032:analysis*; D001324:Autoantigens / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D012216:Rheumatic Diseases / Q000175:diagnosis / Q000276:immunology*; D012261:Ribonucleoproteins; D012595:Scleroderma, Systemic / Q000276:immunology; D012859:Sjogren's Syndrome / Q000276:immunology; D000097585:SS-B Antigen
chemical_list: D001323:Autoantibodies; D001324:Autoantigens; D012261:Ribonucleoproteins; D000097585:SS-B Antigen
vernacular_title: Quantifizierung von SS-B Autoantikörpern in Patientenseren mittels hochgereinigtem humanem SS-B Antigen und ihre klinische Interpretation.