title: Tumor-specific L3T4+ and Lyt-2+ lymphocytes in mice primed to mutagenized cell variants.
abstract: We have investigated the tumor-specific reactivity of different T-cell subsets from mice primed with clonal variants of L5178Y and P815 cells treated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). In both tumor systems, anti-parental tumor immunity and protection against non-immunogenic clones were only induced by vaccinating the hosts with highly immunogenic cell variants, and the effect correlated with the detection of TATA-specific delayed-type hypersensitivity (DTH) reactions. The footpad reaction was transferable with spleen cell populations from immunized mice, and enrichment of splenic lymphocytes in L3T4+ but not Lyt-2+ lymphocytes increased the footpad swelling. Unfractionated spleen cell populations from immunized mice released high amounts of IL-2 and IFN-gamma in vitro in response to parental antigens. Purified L3T4+ and Lyt-2+ lymphocytes also produced IFN-gamma when incubated in vitro with the parental tumors and accessory cells. It is suggested that the mechanisms of anti-parental tumor immunity induced by MNNG-treated variants may be similar to those described previously for triazene-xenogenized L5178Y/DTIC cells, and may involve induction of a tumor-specific DTH reaction and IFN-gamma-mediated stimulation of non-specific tumoricidal effects.
authors.affiliation: Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Bianchi
authors.forename: M C
authors.initials: MC
authors.lastname: Fioretti
authors.forename: U
authors.initials: U
authors.lastname: Grohmann
authors.forename: L
authors.initials: L
authors.lastname: Binaglia
authors.forename: L
authors.initials: L
authors.lastname: Romani
authors.forename: P
authors.initials: P
authors.lastname: Puccetti
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D000950:Antigens, Ly / Q000032:analysis*; D000951:Antigens, Neoplasm / Q000276:immunology; D016207:Cytokines / Q000096:biosynthesis; D006649:Histocompatibility Antigens / Q000276:immunology; D006968:Hypersensitivity, Delayed / Q000209:etiology; D016219:Immunotherapy, Adoptive; D007371:Interferon-gamma / Q000096:biosynthesis; D008223:Lymphoma / Q000276:immunology; D012515:Mast-Cell Sarcoma / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D009374:Neoplasms, Experimental / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000951:Antigens, Neoplasm; D016207:Cytokines; D006649:Histocompatibility Antigens; C029237:tumor-associated transplantation antigen; D007371:Interferon-gamma