title: B-lymphocyte heterogeneity: ontogenetic development and organ distribution of B-lymphocyte populations defined by their density of surface immunoglobulin.
abstract: The density of total Ig and of IgM, IgG1, IgG2, and IgA on the surface of adult murine splenic B lymphocytes was measured using the technique of rapid flow microfluorometry. In addition, the density of total surface Ig and of IgM on B lymphocytes derived from adult bone marrow, lymph nodes, and Peyer's patches, and from neonatal spleen was determined. Adult spleen and lymph node B lymphocytes are characterized by the presence of a large population of cells with a low-to-intermediate density of total surface Ig, which is seen as a peak in the fluorescence profiles when these cells are labeled with fluorescein-conjugated (F1) anti-Ig. This peak is not detected when neonatal spleen or adult bone marrow are examined; the development of this peak among spleen cells occurs during the first 4 wk of life. Although the characteristic fluorescence intensity peak is not seen when adult spleen cells are labeled with Fl anti-mu, changes in the density of surface IgM do occur during the first few weeks of life and are detected as a decrease in the frequency of cells which have relatively large amounts of surface IgM. The differences seen in the fluorescence patterns of adult spleen cells labeled with Fl anti-Ig and Fl anti-mu may be due to the appearance of IgD on the surface of mature splenic B lymphocytes. This is supported by the similarity of the fluorescence profiles of adult bone marrow cells stained with Fl anti-Ig and Fl anti-mu, as the latter population of cells is reported to lack surface IgD.
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D001853:Bone Marrow / Q000276:immunology; D001854:Bone Marrow Cells; D005856:Germ-Free Life; D007137:Immunoglobulin alpha-Chains / Q000032:analysis; D007142:Immunoglobulin gamma-Chains / Q000032:analysis; D007145:Immunoglobulin kappa-Chains / Q000032:analysis; D007148:Immunoglobulin mu-Chains / Q000032:analysis; D008198:Lymph Nodes / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008819:Mice, Nude / Q000276:immunology; D010581:Peyer's Patches / Q000276:immunology; D011947:Receptors, Antigen, B-Cell / Q000032:analysis*; D013154:Spleen / Q000276:immunology
chemical_list: D007137:Immunoglobulin alpha-Chains; D007142:Immunoglobulin gamma-Chains; D007145:Immunoglobulin kappa-Chains; D007148:Immunoglobulin mu-Chains; D011947:Receptors, Antigen, B-Cell