title: Antibodies to Epstein-Barr virus associated antigens in Pima Indians with and without rheumatoid arthritis.
abstract: We investigated anti-rheumatoid arthritis-associated nuclear antigens (RANA) and other anti-Epstein-Barr virus (EBV) antibodies in a uniquely controlled study in female Pima Indians of Arizona, an RA prone population. Four groups of age and sex-matched individuals were formulated: (1) individuals positive for rheumatoid factor (RF) who had clinical evidence of rheumatoid arthritis (RA); (2) individuals seropositive for RF, but without arthritis; (3) individuals seronegative for RF, but with various kinds of arthritis; (4) those seronegative without arthritis. The mean anti-RANA in the seropositive RA group was significantly above those of the other groups but the anti-VCA and anti-EBNA titers did not differ. The anti-RANA was shown to be independent of RF. Comparing the Pima Indians to Caucasians in La Jolla, we found the mean anti-RANA titers of the Pimas to be significantly higher than those of the Caucasians. This study thus establishes clearly that elevated anti-RANA titers are characteristics of this American Indian group, just as they are of Caucasian groups. The elevated anti-RANA titers in RA patients may represent a unique hyperresponsiveness to this antigen, since there is no consistency in the reported levels of antibodies to other EBV-related antigens.
mesh_terms: D000914:Antibodies, Viral / Q000032:analysis*; D000941:Antigens / Q000276:immunology*; D000956:Antigens, Viral / Q000276:immunology; D001130:Arizona; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D001324:Autoantigens / Q000276:immunology*; D002213:Capsid / Q000276:immunology; D019309:Epstein-Barr Virus Nuclear Antigens; D005260:Female; D004854:Herpesvirus 4, Human / Q000276:immunology*; D006801:Humans; D005779:Immunodiffusion; D007198:Indians, North American; D008297:Male; D008875:Middle Aged
chemical_list: D000914:Antibodies, Viral; D000941:Antigens; D000956:Antigens, Viral; D001324:Autoantigens; D019309:Epstein-Barr Virus Nuclear Antigens; C030352:rheumatoid arthritis nuclear antigen