title: Activation of Lyt-1+ and Lyt-2+ T cell cloned lines: stimulation of proliferation, lymphokine production, and self-destruction.
abstract: Antigen-induced activation of a chicken gamma-globulin (CGG)-specific Lyt-1+ T cell clone measured both as a function of proliferation and immune interferon (IFN-gamma) production is restricted by a class II determinant of the major histocompatibility complex (MHC) mapped to the I-A subregion, as determined by studies with both recombinant inbred lines and monoclonal antibodies. Activation of Lyt-2+ picryl chloride (PC1)-specific cloned T cell lines by trinitrophenyl (TNP)-coupled spleen cells results in proliferation and the production of at least two lymphokines: lymphotoxin (LT) and IFN-gamma. This antigen-specific activation is restricted to a class I determinant of the MHC complex encoded in the K region. Thus, the common intracellular pathway leading to production of IFN-gamma by Lyt-1+ and Lyt-2+ T cells is mediated and restricted through different surface recognition units. The LT that is produced by antigen-specific activation of T cells not only kills fibroblasts, but it inhibits interleukin 2 (IL 2)-maintained T cells as well. Activation of T cells by concanavalin A (Con A) results in suicidal inhibition of proliferation and cell death by those clones that make LT, but not by those that produce only IFN-gamma under such induction conditions. These results indicate that it is neither Con A nor IFN-gamma that kills T cells, but LT. These results strongly suggest a self-regulatory role of LT in limiting continuing unrestricted T cell response to antigen activation.
authors.forename: B S
authors.initials: BS
authors.lastname: Conta
authors.forename: M B
authors.initials: MB
authors.lastname: Powell
authors.forename: N H
authors.initials: NH
authors.lastname: Ruddle
mesh_terms: D000818:Animals; D000950:Antigens, Ly; D002645:Chickens; D002999:Clone Cells / Q000145:classification / Q000276:immunology / Q000502:physiology; D003208:Concanavalin A / Q000494:pharmacology; D003602:Cytotoxicity, Immunologic; D005260:Female; D006131:Growth Inhibitors / Q000633:toxicity; D006183:H-2 Antigens / Q000235:genetics; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000502:physiology; D008213:Lymphocyte Activation; D008233:Lymphotoxin-alpha / Q000096:biosynthesis* / Q000633:toxicity; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D010641:Phenotype; D051381:Rats; D011919:Rats, Inbred Strains; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology* / Q000502:physiology; D005719:gamma-Globulins / Q000276:immunology
chemical_list: D000950:Antigens, Ly; D006131:Growth Inhibitors; D006183:H-2 Antigens; D008233:Lymphotoxin-alpha; D005719:gamma-Globulins; D003208:Concanavalin A; D007371:Interferon-gamma