title: Regulation of the T 15 idiotype-positive, T-independent immune response to Streptococcus pneumoniae R 36 a (Pn). I. Specific suppressor T cells induced by Pn in vitro are antigen-specific and idiotype-positive.
abstract: Normal BALB/c spleen cells incubated for 2 days with Streptococcus pneumoniae R 36 a (Pn) vaccine in vitro acquired the specific ability to inhibit the T-independent anti-Pn response of fresh lymphocytes. The activated suppressor cells were susceptible to cytotoxic treatment with mouse anti-theta serum plus complement, and they inhibited the anti-Pn response of B lymphocytes deprived of T cells. The suppressive effect was eliminated by adsorbtion of cells on dishes coated with the C polysaccharide from Pn, and treatment of the suppressor cells with a rabbit antibody specific for TEPC-15 myeloma protein, in the presence of complement, abolished the suppressive effect. The results indicate that stimulation of lymphocytes with a T-independent antigen in vitro activates suppressor T cells bearing a specific antigen receptor that may express the idiotype(s) characteristic of anti-Pn antibody, and that these cells inhibit the Pn-reactive B cells directly.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D001402:B-Lymphocytes / Q000276:immunology*; D003165:Complement System Proteins; D000939:Epitopes; D007106:Immune Sera / Q000494:pharmacology; D007130:Immunoglobulin Idiotypes; D051379:Mice; D008807:Mice, Inbred BALB C; D010527:Perissodactyla; D011817:Rabbits; D012756:Sheep; D013296:Streptococcus pneumoniae / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000939:Epitopes; D007106:Immune Sera; D007130:Immunoglobulin Idiotypes; D003165:Complement System Proteins