title: Measurement of spontaneous and stimulated anti-microsomal antibody synthesis in vitro by avidin-biotin enzyme immunoassay.
abstract: The spontaneous and stimulated anti-microsomal (anti-Mic) antibody synthesis in vitro by peripheral blood lymphocytes (PBL) from patients with Hashimoto's thyroiditis (HT) was studied by a highly sensitive and thyroid microsome-specific enzyme immunoassay using an avidin-biotin system (A-B EIA). Since the amount of the synthesized anti-Mic antibody by PBL in vitro is very small, it is difficult to study its kinetics and response to mitogens or the specific antigen by conventional assay systems. We applied the avidin-biotin system to conventional indirect EIA and established an assay system which was about four times as sensitive as indirect EIA. PBL from patients with HT synthesized significant amount of IgG anti-Mic antibody spontaneously but those from normal individuals and patients with rheumatoid arthritis did not. IgG anti-Mic antibody synthesis with pokeweed mitogen stimulation was increased in all HT patients and that with thyroid microsome stimulation was increased in three out of five patients. These results indicate that A-B EIA is a useful system to study the mechanism of anti-Mic antibody synthesis in vitro.
mesh_terms: D000818:Animals; D001323:Autoantibodies / Q000096:biosynthesis*; D001360:Avidin; D001710:Biotin; D006801:Humans; D007124:Immunoenzyme Techniques; D007074:Immunoglobulin G / Q000032:analysis; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008861:Microsomes / Q000276:immunology*; D008862:Microsomes, Liver / Q000276:immunology; D051381:Rats; D013223:Statistics as Topic; D013961:Thyroid Gland / Q000276:immunology*; D013967:Thyroiditis, Autoimmune / Q000276:immunology*
chemical_list: D001323:Autoantibodies; D007074:Immunoglobulin G; D001360:Avidin; D001710:Biotin