title: B cells as antigen-presenting cells: antigen-specific IL-2 production by cloned T cells without expression of IL-2 receptors.
abstract: A murine T cell clone, 24-2C, responds specifically to human IgG (HGG) in the context of I-Ab. B cells purified from mouse spleen cells were examined for their function as antigen-presenting cells (APC) in the response of 24-2C cells to HGG. B cells functioned as APC for IL-2 production but not for proliferation, whereas spleen cells or spleen-adherent cells functioned as APC for both IL-2 production and proliferation. LPS-activated B cells also failed to induce the proliferative response. The addition of the culture supernatant of 24-2C cells stimulated with HGG presented by irradiated spleen cells to the culture of 24-2C cells, irradiated B cells, and HGG induced the proliferative response of 24-2C cells, whereas IL-1, IL-3, and/or interferon-gamma did not reconstitute the proliferation. The expression of IL-2 receptors (IL-2R) on 24-2C cells was examined using a monoclonal anti-mouse IL-2R antibody AMT 13 or 7D4. 24-2C cells cultured with spleen cells as APC expressed IL-2R. Those cultured alone or with B cells as APC did not express IL-2R. Enlargement of 24-2C cells in response to HGG was also examined, and the relative cell size of those cultured with B cells or spleen cells as APC was larger than that of those cultured alone. These results demonstrate that B cells as APC induce IL-2 production and cell size enlargement in the response of 24-2C cloned T cells to HGG, but not IL-2R expression nor proliferation.
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology*; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D002455:Cell Division; D002999:Clone Cells / Q000276:immunology / Q000378:metabolism; D005786:Gene Expression Regulation; D007074:Immunoglobulin G / Q000276:immunology; D007376:Interleukin-2 / Q000096:biosynthesis*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D011971:Receptors, Immunologic / Q000096:biosynthesis*; D015375:Receptors, Interleukin-2; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism
chemical_list: D007074:Immunoglobulin G; D007376:Interleukin-2; D008070:Lipopolysaccharides; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2