title: Suppression of IgE production in unseparated spleen cell cultures.
abstract: When B cells from BALB/c mice were cultured with lipopolysaccharide (LPS) and interleukin-4 (IL-4), a large amount of IgE was detected in the culture supernatants. The IgE production from unseparated spleen cells cultured with LPS and IL-4 was less than the amount of IgE obtained from separated B cells. When syngeneic T cells were added to separated B cells cultures, which were subsequently stimulated with LPS and IL-4, less IgE was produced, as compared to cultures without T cells. The hypothesis that T cells, or factors secreted by these cells, inhibit IgE production is supported by the fact that the degree of suppression of IgE production paralleled the number of T cells added. CD8(+)-enriched T cells were slightly more suppressive than CD4(+)-enriched T cells. Addition of exogenous IL-3 was only partially suppressive. These observations suggest that IL-4 added to unseparated spleen cells in vitro stimulates B cells for IgE production and also stimulates T cells. Lymphokines secreted by these stimulated T cells may in turn act on B cells. Some of these lymphokines, such as interferon-gamma and IL-2, may have a suppressive action on IgE production.
authors.affiliation: Department of Rheumatology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Maeda-Yoshimoto
authors.forename: T
authors.initials: T
authors.lastname: Hirano
authors.forename: H
authors.initials: H
authors.lastname: Miyajima
authors.forename: T
authors.initials: T
authors.lastname: Nagate
authors.forename: K
authors.initials: K
authors.lastname: Hanada
authors.forename: S
authors.initials: S
authors.lastname: Hirose
authors.forename: K
authors.initials: K
authors.lastname: Okumura
authors.forename: Z
authors.initials: Z
authors.lastname: Ovary
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D016827:CD8 Antigens; D002469:Cell Separation; D002478:Cells, Cultured; D005260:Female; D007108:Immune Tolerance; D007073:Immunoglobulin E / Q000096:biosynthesis*; D007376:Interleukin-2 / Q000096:biosynthesis; D007377:Interleukin-3 / Q000096:biosynthesis / Q000494:pharmacology; D015847:Interleukin-4 / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: D016827:CD8 Antigens; D007376:Interleukin-2; D007377:Interleukin-3; D008070:Lipopolysaccharides; D015847:Interleukin-4; D007073:Immunoglobulin E