title: Abnormal ratio of membrane immunoglobulin classes in mice with an X-linked B-lymphocyte defect.
abstract: CBA/N mice have an X-linked genetic defect in B-lymphocyte function manifested by inability to make antibody responses to T-independent antigens. Plasma membrane immunoglobulin (Ig) on spleen, lymph node, and Peyer's patch cells was analyzed by lactoperoxidase-catalyzed iodination, NP-40 extraction, specific immunoprecipitation, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These studies indicated that the X-linked immune defect was associated, in all three cell types, with a decrease in the ratio of cell membrane IgD analog to cell membrane IgM. This suggests either that IgD analog may be important in initiation of T-independent antibody responses or that CBA/N mice lack a subpopulation of B cells specialized to respond to T-independent antigens, and that these cells are relatively rich in plasma membrane IgD analog.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D008040:Genetic Linkage; D007153:Immunologic Deficiency Syndromes / Q000235:genetics*; D008198:Lymph Nodes / Q000276:immunology; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010581:Peyer's Patches / Q000276:immunology; D011947:Receptors, Antigen, B-Cell; D012730:Sex Chromosomes; D013154:Spleen / Q000276:immunology
chemical_list: D011947:Receptors, Antigen, B-Cell