title: MHC class-I-restricted auto-tumor-specific CD4+CD8- T-cell clones established from autologous mixed lymphocyte-tumor-cell culture (MLTC).
abstract: Autologous mixed lymphocyte-tumor cell cultures (MLTC) were initiated with cytokine (IFN gamma and TNF alpha)-treated ex-vivo tumor cells of lung, ovarian, breast and stomach carcinomas. The cytokine-treated tumors expressed class-I but not class-II molecules. Although the proportion of CD8+ lymphocytes increased in the bulk culture of MLTCs, in 5/7 experiments the majority of the established T-cell clones were CD4+. Among the CD8+ clones a high proportion (77%) was cytotoxic, while the proliferative response was more frequent among the CD4+ clones (70%). In 4/26 cytotoxic T-lymphocyte (CTL) clones (3/17 CD4+ and 1/9 CD8+), derived from a patient with class I+ class II- stomach carcinoma, lysis was restricted to the autologous tumor cells. These auto-tumor-specific clones did not lyse the autologous ConA blasts, the 5 allogeneic ex-vivo tumors, the NK-sensitive K562 or the relatively sensitive Daudi cells. The cytotoxicity of these clones was inhibited by pre-incubation of the tumor cells with W6/32 (alpha-class I) MAb, or by preincubation of the lymphocytes with OKT3 (alpha-CD3) MAb. The alpha-CD4 (OKT4) MAb had only a marginal effect on the CD4+ clones, while the lytic function of the CD8+ clone was inhibited by the alpha-CD8 (OKT8) MAb. The 3 CD4+ CTL clones also responded with proliferation to the autologous tumor cells. This proliferative response was inhibited by the presence of W6/32 MAb. Our results indicate that the auto-tumor lysis exerted by CD4+ CTL clones was restricted by the class-I antigens, and that the CD4 molecules of the clones were not essential for the lytic interaction.
authors.affiliation: Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Vánky
authors.forename: E
authors.initials: E
authors.lastname: Klein
mesh_terms: D000911:Antibodies, Monoclonal; D001943:Breast Neoplasms / Q000276:immunology*; D015704:CD4 Antigens / Q000032:analysis* / Q000276:immunology; D016827:CD8 Antigens / Q000032:analysis* / Q000276:immunology; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic; D005260:Female; D005434:Flow Cytometry; D015395:Histocompatibility Antigens Class I / Q000032:analysis / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D007376:Interleukin-2 / Q000494:pharmacology; D007680:Kidney Neoplasms / Q000276:immunology*; D008175:Lung Neoplasms / Q000276:immunology*; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology; D010051:Ovarian Neoplasms / Q000276:immunology*; D011994:Recombinant Proteins / Q000494:pharmacology; D013274:Stomach Neoplasms / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000187:drug effects / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D000911:Antibodies, Monoclonal; D015704:CD4 Antigens; D016827:CD8 Antigens; D015395:Histocompatibility Antigens Class I; D007376:Interleukin-2; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma