title: Hapten-specific T cell responses to 4-hydroxy-3-nitrophenyl acetyl. XIII. Characterization of a third T cell population involved in suppression of in vitro PFC responses.
abstract: The involvement of a third-order suppressor T cell population (Ts3) in the suppression of in vitro PFC responses was analyzed. It was shown that Ts2 effector-phase suppressor cells, induced by the i.v. injection of NP-coupled syngeneic spleen cells, require a third suppressor T cell population to effect NPb idiotype-specific suppression of an in vitro B cell response. This Ts3 population was shown to be present in NP-primed but not unprimed donors. The Ts3 population specifically binds NP and is Lyt-1-, Lyt-2+, I-J+ and bears NPb idiotypic determinants. The involvement of the Ts3 population in a suppressor pathway that requires recognition of idiotypic determinants is discussed.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology*; D000939:Epitopes; D004912:Erythrocytes / Q000276:immunology; D006168:Guinea Pigs; D006241:Haptens / Q000276:immunology*; D006462:Hemolytic Plaque Technique; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009596:Nitrophenols / Q000276:immunology*; D010648:Phenylacetates; D012756:Sheep; D013154:Spleen / Q000166:cytology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000939:Epitopes; D006241:Haptens; D000949:Histocompatibility Antigens Class II; D007130:Immunoglobulin Idiotypes; D009596:Nitrophenols; D010648:Phenylacetates; C026242:4-hydroxy-5-nitrophenyl acetic acid