title: Crucial role of TNF-alpha in CD8 T cell-mediated elimination of 3LL-A9 Lewis lung carcinoma cells in vivo.
abstract: The role of perforin, IFN-gamma, and TNF-alpha in anti-tumor CD8 T cell immunity was examined in a new tumor model using a CD8 T cell epitope (GP33) derived from lymphocytic choriomeningitis virus as a tumor-associated Ag. In contrast with parental 3LL-A9 (A9) Lewis lung carcinoma cells that progressively grow in C57BL/6 mice, s.c. injection of GP33-transfected A9GP33 tumor cells induced a protective GP33-specific CD8 T cell response that led to complete tumor cell elimination. Tumor regression was dependent on perforin, IFN-gamma, or TNF-alpha, because A9GP33 tumors developed in mice deficient in one of these genes. A9GP33 tumors arising in perforin- and IFN-gamma-deficient mice represented GP33 Ag-loss variants, demonstrating that GP33-specific CD8 T cells from these mice were able to exert an Ag selection pressure. In contrast, tumor cells growing in TNF-alpha knock-out mice still expressed the tumor-associated GP33 peptide despite the presence of activated GP33-specific CD8 T cells. These findings provide evidence for a crucial role of TNF-alpha in A9 tumor cell elimination by CD8 T cells in vivo.
authors.affiliation: Institute of Medical Microbiology and Hygiene, Department of Immunology, University of Freiburg, Freiburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Prévost-Blondel
authors.forename: E
authors.initials: E
authors.lastname: Roth
authors.forename: F M
authors.initials: FM
authors.lastname: Rosenthal
authors.forename: H
authors.initials: H
authors.lastname: Pircher
mesh_terms: D000818:Animals; D000956:Antigens, Viral; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D018827:Carcinoma, Lewis Lung / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D002455:Cell Division / Q000276:immunology; D002465:Cell Movement / Q000276:immunology; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic / Q000235:genetics / Q000276:immunology*; D018984:Epitopes, T-Lymphocyte / Q000096:biosynthesis / Q000235:genetics; D006023:Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D007371:Interferon-gamma / Q000172:deficiency / Q000235:genetics; D008217:Lymphocytic choriomeningitis virus / Q000235:genetics / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D008562:Membrane Glycoproteins / Q000172:deficiency / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D009368:Neoplasm Transplantation; D010446:Peptide Fragments / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D054353:Perforin; D052899:Pore Forming Cytotoxic Proteins; D014162:Transfection; D014407:Tumor Cells, Cultured / Q000276:immunology / Q000378:metabolism / Q000637:transplantation; D014409:Tumor Necrosis Factor-alpha / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D014764:Viral Proteins
chemical_list: D000956:Antigens, Viral; D018984:Epitopes, T-Lymphocyte; D006023:Glycoproteins; D008562:Membrane Glycoproteins; D010446:Peptide Fragments; D052899:Pore Forming Cytotoxic Proteins; D014409:Tumor Necrosis Factor-alpha; D014764:Viral Proteins; C094244:glycoprotein peptide 33-41, Lymphocytic choriomeningitis virus; D054353:Perforin; D007371:Interferon-gamma