title: The recovery of the B-cell population in adult thymectomized, lethally irradiated and bone marrow-reconstituted mice.
abstract: The recovery of the B-cell population in adult thymectomized, irradiated and bone marrow-reconstituted mice (T X BM mice was estimated at various times after bone marrow transplantation. The spleen cells to be tested were mixed with dexamethasone-resistant thymocytes (DRT) and sheep red blood cells (SRBC) and transferrred to irradiated recipients. The number of plaque-forming cells (PFC) in the spleen of the recipients was determined 7 days later. Using this functional B-cell assay a sequential appearance of the precursors of IgM-, IgG- and IgA-PFC in the spleen of T X BM mice was observed. The precursors of IgM-PFG (IgM-B cells) were present immediately after transplantation. The first IgG-B cells could be detected at 13-16 days after transplantation and the IgA-B cells finally appeared at 22 days after transplantation. The number of B cells reached a constant and normal level at 30 days after transplantation. The IgM-, IgG- and IgA-B cell development in sham-thymectomized, irradiated and bone narrow-reconstituted mice (ST X BM mice) was virtually the same as in T X BM mice.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D001854:Bone Marrow Cells; D016026:Bone Marrow Transplantation; D005260:Female; D007109:Immunity / Q000528:radiation effects; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D011830:Radiation Effects; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology; D013997:Time Factors; D014184:Transplantation, Homologous
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M