title: Expression of the major rheumatoid factor cross-reactive idiotype in juvenile rheumatoid arthritis.
abstract: The major rheumatoid factor cross-reactive idiotype (RF-CRI), defined by prototypic monoclonal IgM rheumatoid factors, is expressed in high frequency by pokeweed mitogen-derived plasma cells from patients with rheumatoid arthritis who express RF in their sera. Unlike adults with rheumatoid arthritis, most patients with juvenile rheumatoid arthritis are seronegative for RF, as detected by classic IgG binding assays. We report that approximately 50% of seronegative patients with juvenile rheumatoid arthritis express the RF-CRI in high frequency among their pokeweed mitogen-derived plasma cells, and that approximately 33% of patients express the RF-CRI in high titer in their sera. The possible mechanisms for expression of an idiotypic marker of RF without expression of IgG binding activity by classic assays are discussed.
authors.affiliation: Division of Allergy/Immunology, Schneider Children's Hospital, Long Island Jewish Medical Center, New Hyde Park 11042.
authors.forename: N T
authors.initials: NT
authors.lastname: Ilowite
authors.forename: J F
authors.initials: JF
authors.lastname: Wedgwood
authors.forename: V R
authors.initials: VR
authors.lastname: Bonagura
mesh_terms: D000293:Adolescent; D001171:Arthritis, Juvenile / Q000097:blood*; D002648:Child; D002675:Child, Preschool; D003429:Cross Reactions; D005260:Female; D006801:Humans; D007130:Immunoglobulin Idiotypes / Q000096:biosynthesis*; D007223:Infant; D008297:Male; D010950:Plasma Cells / Q000187:drug effects / Q000378:metabolism; D011043:Pokeweed Mitogens / Q000494:pharmacology; D012217:Rheumatoid Factor / Q000096:biosynthesis*
chemical_list: D007130:Immunoglobulin Idiotypes; D011043:Pokeweed Mitogens; D012217:Rheumatoid Factor