title: Demonstration that IgG memory is carried by IgG-bearing cells.
abstract: Memory B cells which give rise to IgG antibody-producing cells were generally assumed to be IgG-bearing cells. However, recent studies indicating that very few IgG-bearing cells exist in lymphoid tissue brought this assumption into question. In this study, we examined directly the question whether IgG-bearing cells contain functional precursors of IgG antibody-producing cells. Using the adoptive secondary immune response, we demonstrated that Ig-1 b-bearing cells, isolated with the fluorescence-activated cell sorter (FACS), are the functional precursors of Ig- 1 b-producing cells. Further, we have enriched IgG2 and IgG1 memory B cells using the FACS. The results show that IgG2-bearing cells are the functional precursors of the IgG2 antibody-producing cells. Likewise, the IgG1-bearing cells are the functional precursors of IgG1 antibody-producing cells. Thus, IgG memory cells have surface IgG which indicates the class and allotype commitment of the memory cell and its progeny antibody-forming cells.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D002469:Cell Separation; D007126:Immunoglobulin Allotypes; D007074:Immunoglobulin G / Q000032:analysis / Q000096:biosynthesis; D007156:Immunologic Memory; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000276:immunology
chemical_list: D007126:Immunoglobulin Allotypes; D007074:Immunoglobulin G