title: The xenogeneic effect. I. Antigen and mitogen-stimulated human lymphocytes produce a non-antigen-specific factor which reconstitutes the antibody response of T cell-deficient mouse spleen cells.
abstract: Modified Marbrook culture vessels with two chambers separated by a 0.2-mu porosity membrane have been utilized to show that antigen-stimulated human lymphocytes produce a soluble factor(s) which restores the ability of thymectomized, irradiated, and bone marrow-protected mice to mount a primary IgM plaque-forming cell response in vitro. In the initial experiments, the human lymphocytes plus antigen (sheep erythrocytes) were cultured in the lower chambers of the Marbrook vessels and the T cell-deficient mouse spleen cells plus sheep erythrocytes were cultured in the upper chambers. The response of the spleen cells was shown to be enhanced as a function of the number of human lymphocytes in the lower chambers. In subsequent experiments, the human lymphocytes were challenged with allogeneic lymphocytes or activated with a variety of T cell mitogens. Supernatants from these cultures, when placed in the lower chambers of the Marbrook vessels, were also capable of reconstituting the antibody-forming cell response of the mouse B cells. The results of the experiments are discussed in relation to a model of B cell induction which incorporates a non-antigen-specific "helpher" T cell.
mesh_terms: D000818:Animals; D000917:Antibody Formation / Q000187:drug effects*; D000941:Antigens; D003208:Concanavalin A / Q000494:pharmacology; D004768:Enterotoxins / Q000494:pharmacology; D000939:Epitopes; D004912:Erythrocytes / Q000276:immunology; D005260:Female; D006462:Hemolytic Plaque Technique; D006801:Humans; D037102:Lectins / Q000494:pharmacology; D008214:Lymphocytes / Q000276:immunology* / Q000378:metabolism; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008934:Mitogens / Q000494:pharmacology*; D012756:Sheep; D013154:Spleen / Q000276:immunology; D013210:Staphylococcus / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014183:Transplantation, Heterologous
chemical_list: D000941:Antigens; D004768:Enterotoxins; D000939:Epitopes; D037102:Lectins; D008934:Mitogens; D003208:Concanavalin A