title: Restricted classes of immunoglobulin produced by a lymphoid cell line from a patient with agammaglobulinemia.
abstract: Restricted expression of immunoglobulin by a long-term B lymphoid cell line derived from a patient with X-linked agammaglobulinemia is reproted. The patient had peripheral blood B lymphocytes with surface IgD and IgM. Culture of the B cells in vitro with mitogens did not stimulate immunoglobulin secretion, although pokeweed mitogen stimulation resulted in the development of cytoplasmic IgD and IgM. The lymphoid cell line established from these B lymphocytes primarily bore surface IgD, with a small population of cells also bearing surface IgM. These cells also had cytoplasmic immunoglobulin, primarily IgD. The cell line did not have a cytoplasmic pool of immunoglobulin for export and did not secrete immunoglobulin. This B lymphoid cell line is an in vitro analogue of the arrest in differentiation of the patient's B lymphocytes. The IgD-bearing phenotype may represent a normal transitional stage in the differentiation of B lymphocytes.
mesh_terms: D000293:Adolescent; D000361:Agammaglobulinemia / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D002472:Cell Transformation, Viral; D004854:Herpesvirus 4, Human; D006801:Humans; D007072:Immunoglobulin D / Q000378:metabolism; D007075:Immunoglobulin M / Q000378:metabolism; D007152:Immunologic Capping; D008297:Male; D011947:Receptors, Antigen, B-Cell / Q000378:metabolism*
chemical_list: D007072:Immunoglobulin D; D007075:Immunoglobulin M; D011947:Receptors, Antigen, B-Cell