title: [Stimulation of immunoglobin synthesis and rheumatoid-factor production by rheumatoid synovial effusions and by supernatants of synovial tissue cultures].
abstract: Factors capable of stimulating the synthesis of immunoglobulin by circulating human lymphocytes, as measured by a radioactive immune coprecipitation method, have been demonstrated in rheumatoid synovial eeffusions but not in effusions from patients with other arthritides. The activity of the ffusions was localized in two fractions eluted from an agarose A 5m column: fraction II eluting with IgM and fraction E eluting with albumin. Fraction II enhanced immunoglobulin synthesis only in circulating rheumatoid lymphocytes, while fraction V enhanced immunoglobulin synthesis in both rheumatoid and normal lymphocytes. Similar active fractions were found in culture supernatants of rheumatoid synovial tissue. Enhanced immunoglobulin synthesis was also observed following addition of aggregated IgG to rheumatoid lymphocytes. Finally, increased synthesis of anti-IgG (rheumatoid factor) was observed following addition of fractions II and V to rheumatoid but not to normal lymphocytes. The possible relationship of the active material in fraction II to IgG-containing immune complexes and the active material in fraction V to a T cell produced lymphokine-like mediator of T cell function are discussed. The findings presented provide evidence that in addition to antigenic stimulation, the action of one or more enhancing factors liberated by antigen stimulated mononuclear cells, possibly T lymphocytes, plays a role in the immunoglobulin synthesis observed in rheumatoid synovial tissue.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002478:Cells, Cultured; D006801:Humans; D008222:Lymphokines / Q000032:analysis*; D012217:Rheumatoid Factor / Q000096:biosynthesis*; D013347:Subcellular Fractions / Q000276:immunology; D013582:Synovial Fluid / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D008222:Lymphokines; D012217:Rheumatoid Factor
vernacular_title: Steigerung der Immunglobulinsynthese und Rheumafaktorproduktion durch rheumatoide Synovialergüsse und Uberstand von Synovialgewebskulturen