title: Characterization of IgD. II. Molecular forms of IgD in human B cells.
abstract: Endogenous and surface labeling techniques were used on human lymphoid cells to characterize intracytoplasmic, membrane and secreted IgD, IgD synthesized by lymphocytes and inserted into the cell membrane displayed a single molecular form with the same mobility in sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) as the previously described slow migrating serum IgDl. Plasma cells produced and secreted IgDl and another IgD corresponding to the faster-moving serum IgD2. Conversion of one molecular form into the other was never observed, thus indicating that neither molecule is a precursor or a degradation product of the other.
mesh_terms: D001345:Autoradiography; D001402:B-Lymphocytes / Q000276:immunology*; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D006801:Humans; D007072:Immunoglobulin D / Q000032:analysis* / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000032:analysis; D007945:Leukemia, Lymphoid / Q000276:immunology; D008970:Molecular Weight; D010950:Plasma Cells / Q000276:immunology; D011947:Receptors, Antigen, B-Cell / Q000032:analysis
chemical_list: D007072:Immunoglobulin D; D007075:Immunoglobulin M; D011947:Receptors, Antigen, B-Cell