title: Marked expansion of CD11c+CD8+ T-cells in melanoma-bearing mice induced by anti-4-1BB monoclonal antibody.
abstract: 4-1BB (CD137), a member of the tumor necrosis factor receptor superfamily, is expressed on activated T-cells, and 4-1BB signaling due to interaction with 4-1BB ligand or ligation with anti-4-1BB monoclonal antibody (mAb) costimulates T cells. It has been shown that administration of anti-4-1BB mAb induces anti-tumor immunity in mice, but the nature of the cellular subsets responsible for this immunity is uncertain. In this study we found that anti-4-1BB mAb administration to B16F10 melanoma-bearing mice induced marked expansion of CD11c+CD8+ T-cells in parallel with suppression of pulmonary tumors. The mAb-treated mice produced higher levels of IFN- in their tumor tissues, spleen and lymph nodes than mice exposed to control antibody. When the CD11c+CD8+ T-cells were purified and re-stimulated in vitro, they produced high levels of the Th1 cytokines, IFN- and IL-2, but low levels of the Th2 cytokines, IL-4 and IL-10. Furthermore, they expressed high levels of 4-1BB and CD107a, a marker of activated cytotoxic T-lymphocytes. Our results suggest that CD11c+CD8+ T-cells play a role in the anti-tumor immunity induced by anti-4-1BB mAb.
authors.affiliation: Department of Biological Sciences and Immunomodulation Research Center, University of Ulsan, Ulsan 680-749, Korea.
authors.forename: Seong-A
authors.initials: SA
authors.lastname: Ju
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Park
authors.forename: Sang-Chul
authors.initials: SC
authors.lastname: Lee
authors.forename: Byoung S
authors.initials: BS
authors.lastname: Kwon
authors.forename: Byung-Sam
authors.initials: BS
authors.lastname: Kim
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000502:physiology*; D039521:CD11c Antigen / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D007371:Interferon-gamma / Q000096:biosynthesis; D008175:Lung Neoplasms / Q000276:immunology; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology*; D008546:Melanoma, Experimental / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D053261:Tumor Necrosis Factor Receptor Superfamily, Member 9 / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D039521:CD11c Antigen; D053261:Tumor Necrosis Factor Receptor Superfamily, Member 9; D007371:Interferon-gamma