title: Functional significance of anti-T-lymphocyte antibodies in sarcoidosis.
abstract: Pulmonary sarcoidosis is a chronic disorder characterized by the activation of helper/inducer T-cells in the lung without a concomitant increase in suppressor/cytotoxic T-cells. It is known that patients with sarcoidosis have circulating anti-T-cell antibodies, primarily of the IgM class. To evaluate a functional role for these antibodies in enhancing lung helper T-cell processes in pulmonary sarcoidosis, we evaluated serum and lavage fluid of patients with active sarcoidosis for the presence of anti-T-cell antibodies, the T-cell subset specificity of these antibodies, and the possible stimulatory or inhibitory effects of these antibodies on T-cells relevant to the exaggerated helper T-cell processes in sarcoidosis. Indirect immunofluorescence studies demonstrated that sarcoid patients had anti-T-cell antibodies of the IgM type reacting with autologous as well as with nonautologous normal T-cells. IgM recovered in sarcoid lavage fluid also reacted with T-cells, thus demonstrating the autoantibodies at the site of disease. Two-color immunofluorescence and flow cytometry showed that these sarcoid autoantibodies bound to mostly Leu2+ suppressor/cytotoxic T-cells, but also to a small proportion of Leu3+ helper/inducer T-cells. Incubating lymphocytes with sarcoid serum or IgM purified from sarcoid serum did not stimulate T-cell proliferation. Furthermore, when Leu2+ T-cells were stimulated with irradiated allogenic B-cells, increasing concentrations of sarcoid serum had no inhibitory effects on the activation and proliferative response of the Leu2+ T-cells. Likewise, the purified IgM anti-T-cell antibodies had no inhibitory effects on the mitogenic response of Leu2+ T-cells to the anti-T-cell antigen receptor-associated T3 complex antibody OKT3.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Pulmonary Branch, National Heart, Lung and Blood Institute, Bethesda, MD 20892.
authors.forename: J R
authors.initials: JR
authors.lastname: Spurzem
authors.forename: C
authors.initials: C
authors.lastname: Saltini
authors.forename: R G
authors.initials: RG
authors.lastname: Crystal
mesh_terms: D000328:Adult; D000906:Antibodies / Q000502:physiology*; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008171:Lung Diseases / Q000276:immunology* / Q000503:physiopathology; D008213:Lymphocyte Activation; D008297:Male; D012507:Sarcoidosis / Q000276:immunology* / Q000503:physiopathology; D013601:T-Lymphocytes / Q000276:immunology* / Q000502:physiology; D013602:T-Lymphocytes, Cytotoxic / Q000502:physiology; D006377:T-Lymphocytes, Helper-Inducer / Q000502:physiology; D050378:T-Lymphocytes, Regulatory / Q000502:physiology
chemical_list: D000906:Antibodies; D007074:Immunoglobulin G; D007075:Immunoglobulin M