title: The Ro ribonucleoprotein particle: induction of autoantibodies and the detection of Ro RNAs among species.
abstract: High titers of autoantibody specific for the Ro(SSA) ribonucleoprotein are frequently found in patients with systemic lupus erythematosus and Sjogren's syndrome. In this study we have analyzed the immune responses to the Ro particle when utilized as an immunogen in animal hosts. Anti-Ro autoantibodies which bound autologous Ro ribonucleoprotein particles were induced in rabbits. In immunodiffusion studies using crude rabbit tissue extracts, the rabbit antibody made a precipitin line of identity with a prototype human anti-Ro serum. In solid-phase assays, the human autoimmune serum and the antigen-induced rabbit serum competed for similar or overlapping epitopes on the Ro particle. The rabbit and human sera precipitated the four Ro RNAs from human cells as well as four previously uncharacterized Ro RNAs from a bovine cell line, three Ro RNAs from a rabbit cell line, and two Ro RNAs from duck cells. While total numbers of cellular Ro RNAs differ among species, all possess an RNA of common size which comigrated with the hY1 of human cells.
authors.affiliation: Department of Medicine, Yale University School of Medicine, New Haven, Connecticut 06510.
authors.forename: M J
authors.initials: MJ
authors.lastname: Mamula
authors.forename: C A
authors.initials: CA
authors.lastname: O'Brien
authors.forename: J B
authors.initials: JB
authors.lastname: Harley
authors.forename: J A
authors.initials: JA
authors.lastname: Hardin
mesh_terms: D000818:Animals; D000974:Antibodies, Antinuclear / Q000276:immunology; D000917:Antibody Formation; D000936:Antigen-Antibody Complex; D001323:Autoantibodies / Q000096:biosynthesis*; D001324:Autoantigens / Q000276:immunology*; D001667:Binding, Competitive; D002417:Cattle; D002460:Cell Line; D005455:Fluorescent Antibody Technique; D005779:Immunodiffusion; D007700:Kinetics; D011233:Precipitin Tests; D020733:RNA, Small Cytoplasmic; D011817:Rabbits; D012261:Ribonucleoproteins / Q000276:immunology*; D000099207:SS-A Antigen
chemical_list: D000974:Antibodies, Antinuclear; D000936:Antigen-Antibody Complex; D001323:Autoantibodies; D001324:Autoantigens; D020733:RNA, Small Cytoplasmic; D012261:Ribonucleoproteins; D000099207:SS-A Antigen; C116006:RO60 protein, human; C035356:SS-A antibodies