title: IgG anti-tetanus toxoid antibody synthesis by human bone marrow. I. Two distinct populations of marrow B cells and functional differences between marrow and peripheral blood B cells.
abstract: This investigation uses a system for inducing and detecting anti-tetanus toxoid antibody (anti-TT) synthesis to study specific antibody (Ab) synthesis by bone marrow mononuclear cells (MC). We measured the amounts of anti-TT secreted and the number of B cells secreting antibody (Ab). The ELISA plaque detects single B cells secreting specific Ab. The results show that (1) spontaneous anti-TT secretion by MC is higher than spontaneous anti-TT secretion by peripheral blood lymphocytes (PBL) using an ELISA plaque (P less than 0.01); (2) spontaneous anti-TT production by MC correlated with the serum anti-TT titers as measured by an ELISA (r = 0.75, P = 0.005); (3) two types of marrow B cells were identified--one that spontaneously secretes anti-TT and another that produces anti-TT after TT-stimulation; (4) the frequency of anti-TT-secreting B cells is higher in MC than in PBL; (5) the amount of Ab secreted per marrow B cell is not different from that secreted by a peripheral B cell; and (6) marrow B cells could be induced to produce anti-TT in vitro up to 10 months without added cytokines. These results show that bone marrow is a major repository for differentiated B cells that spontaneously produce Abs to maintain circulating Abs titers and for memory B cells that can be induced to produce specific Ab.
authors.affiliation: Department of Medicine, Wayne State University, Detroit, Michigan.
authors.forename: L G
authors.initials: LG
authors.lastname: Lum
authors.forename: E
authors.initials: E
authors.lastname: Burns
authors.forename: M M
authors.initials: MM
authors.lastname: Janson
authors.forename: P J
authors.initials: PJ
authors.lastname: Martin
authors.forename: B R
authors.initials: BR
authors.lastname: Giddings
authors.forename: M C
authors.initials: MC
authors.lastname: Seigneuret
authors.forename: J E
authors.initials: JE
authors.lastname: Noges
authors.forename: S C
authors.initials: SC
authors.lastname: Galoforo
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D001402:B-Lymphocytes / Q000378:metabolism*; D001853:Bone Marrow / Q000276:immunology*; D001854:Bone Marrow Cells; D018106:CD28 Antigens; D002478:Cells, Cultured; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis* / Q000276:immunology / Q000378:metabolism; D016130:Immunophenotyping; D007963:Leukocytes, Mononuclear / Q000276:immunology / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology; D013745:Tetanus Toxoid / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D018106:CD28 Antigens; D007074:Immunoglobulin G; D013745:Tetanus Toxoid