title: Development of B lymphocytes in the mouse; studies of the frequency and distribution of surface IgM and IgD in normal and immune-defective CBA/N F1 mice.
abstract: Affinity-purified anti-mouse mu and delta antibodies and flow microfluorometric techniques were utilized to study the frequency and distribution of sIgM and sIgD on adult and neonatal B lymphocytes of immunologically normal mice and mice with the immune-defect characteristic of the CBA/N strain. Neonatal normal B lymphocytes can be distinguished from their adult counterparts by the presence of increased amounts of sIgM on sIgM+ cells and by the increased number of sIgM+IgD- cells. The most primitive B lymphocytes of immunologically normal mice appear to reside in the bone marrow of 1- to 2-wk-old mice and are distinguished from splenic B lymphocytes at this time by their relatively low amounts of sIgM. However, in the adult, splenic and bone marrow B lymphocytes are indistinguishable with regard to the quantities of their sIgM or sIgD. Adult immune-defective mice have increased amounts of sIgM on their B lymphocytes, although the number of sIgM+ IgD- cells in these mice is not increased. During development, however, larger than normal numbers of sIgM+ IgD- cells are found in the spleen and bone marrow of these mice; and the low frequency of such cells seen in normal adults is not achieved in immune defectives until after the 56th day of life. Thereafter, immune-defective mice have low frequencies of B lymphocytes with high relative amounts of sIgM, even after 1 yr or age.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002454:Cell Differentiation; D005260:Female; D005455:Fluorescent Antibody Technique; D007072:Immunoglobulin D; D007075:Immunoglobulin M; D007153:Immunologic Deficiency Syndromes / Q000276:immunology; D008221:Lymphoid Tissue / Q000276:immunology; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D008811:Mice, Inbred DBA; D008974:Mollusca; D011817:Rabbits; D011947:Receptors, Antigen, B-Cell; D013154:Spleen / Q000276:immunology
chemical_list: D007072:Immunoglobulin D; D007075:Immunoglobulin M; D011947:Receptors, Antigen, B-Cell