title: Autoimmune human T lymphocytes specific for acetylcholine receptor.
abstract: Myasthenia gravis is one of the best characterized human autoimmune disorders. Circulating autoantibodies to the nicotinic acetylcholine receptor (AChR) at the neuromuscular junction play a prominent part in the effector phase, that is, the immunoregulation. Indirect evidence, such as thymic abnormalities and the association with certain histocompatibility antigens (for example HLA-B8,-DR3) suggests a defect of immunoregulation at the level of thymus-dependent (T) lymphocytes. We report here on the isolation of autoreactive T cells from six patients with myasthenia gravis. From one of these patients, who is homozygous for HLA-DR3, we established a long-term T-cell line. The line cells are specific for purified fish and human AChR, display the surface phenotype of inducer/helper T cells and are genetically restricted to HLA-DR3. AChR-induced proliferation could be inhibited with two monoclonal antibodies against monomorphic DR determinants and also with DR3-specific alloantiserum.
mesh_terms: D001327:Autoimmune Diseases / Q000276:immunology*; D002460:Cell Line; D002469:Cell Separation; D006684:HLA-DR Antigens; D015803:HLA-DR3 Antigen; D000949:Histocompatibility Antigens Class II / Q000032:analysis / Q000276:immunology; D006801:Humans; D009157:Myasthenia Gravis / Q000235:genetics / Q000276:immunology*; D010641:Phenotype; D011950:Receptors, Cholinergic / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006684:HLA-DR Antigens; D015803:HLA-DR3 Antigen; D000949:Histocompatibility Antigens Class II; D011950:Receptors, Cholinergic