title: Macrophage-dependent and B-cell-dependent proliferative T-cell populations in the peritoneal exudate cells of immunized mice.
abstract: The antigen-dependent proliferative response of the Ia- T lymphocyte population in peritoneal exudate cells (PEC) of C3H/HeN mice immunized with horse red blood cells (HRBC) was examined by determining the uptake of tritiated thymidine ([3H]TdR) into the cells in vitro. Both the antigen and accessory cell population, which was either macrophages or B lymphocytes that had been prepared from the PEC or spleen of unimmunized mice, were necessary for the proliferative response of the Ia- T cell population and also the production of IL-2 by the Ia- T cells, but the Ia- T cell population could proliferate in the absence of antigen and accessory cells, if IL-2 was present. The IL-2-dependent proliferation of the Ia- T cells was augmented in the presence of macrophages, but not B cells. The Ia- T cells that had been treated previously with anti-IL-2 receptor (IL-2R) antibody showed no response to IL-2 in the presence or absence of B cells, but responded to IL-2 in the presence of macrophages. Direct contact of the Ia- T cells with macrophages seemed to be necessary for augmentation of the proliferative response of the Ia- T cells to IL-2 because the separation of these cell populations by a membrane filter in a Marbrook type culture vessel resulted in poor augmentation of the response. Cell-associated IL-1 did not participate in the augmentation because paraformaldehyde-treated macrophages did not help the response. When the Ia- T cells had been previously treated with complement and anti-asialo GM1 antibody, the IL-2-dependent proliferative response was not affected, but the augmentation of the response by macrophages was blocked. Previous treatment of the cells with anti-L3T4 antibody diminished the response to IL-2, but did not affect the augmentation of the response by macrophages. Pretreatment of the cells with anti-Thy-1.2-antibody reduced the response to IL-2 and the augmentation by macrophages. Therefore, we concluded that there are at least two populations, capable of responding to IL-2 in the immune Ia- T cell population; one with L3T4 surface antigen and another with asialo GM1 antigen. The response of the latter cells, but not the former, to IL-2 is augmented in the presence of macrophages.
authors.affiliation: Department of Bacteriology, Ohu University School of Dentistry, Koriyama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nitta
authors.forename: Y
authors.initials: Y
authors.lastname: Wakairo
authors.forename: N
authors.initials: N
authors.lastname: Hirayama
authors.forename: M
authors.initials: M
authors.lastname: Nakano
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D007114:Immunization; D016899:Interferon-beta / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology; D008211:Lymphocyte Cooperation; D008264:Macrophages / Q000276:immunology*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H / Q000276:immunology; D010529:Peritoneal Cavity / Q000166:cytology*; D011994:Recombinant Proteins / Q000494:pharmacology; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D007376:Interleukin-2; D011994:Recombinant Proteins; D016899:Interferon-beta