title: Unmasking immunosurveillance against a syngeneic colon cancer by elimination of CD4+ NKT regulatory cells and IL-13.
abstract: We have previously observed a novel role of natural killer T (NKT) cells in negative regulation of antitumor immune responses against an immunogenic regressor tumor expressing a transfected viral antigen. Here, we investigated whether hidden spontaneous antitumor immunosurveillance, in the absence of a vaccine, could be revealed by disruption of this negative regulatory pathway involving CD4+ NKT cells and interleukin-13 (IL-13), in a murine pulmonary metastasis model of a nontransfected, nonregressor, syngeneic tumor, the CT26 colon carcinoma. Lung metastases of CT26 were decreased in CD4+ T cell-depleted BALB/c mice, suggesting that CD4+ T cells were involved in negative regulation of antitumor responses. CD1-knock out (CD1-KO) mice, which have conventional CD4+ T cells and CD4+CD25+ regulatory T cells but lack CD1-restricted CD4+ NKT cells, were significantly resistant to lung metastasis of CT26. The metastases were not further decreased in CD4+ T cell-depleted CD1-KO mice, implying that CD4+ NKT cells might be the primary negative regulator of antitumor immune responses in BALB/c mice. CD8+ T cells were found to act as effectors in antitumor immune responses, since the inhibition of lung metastases observed in naive CD1-KO or CD4+ T cell-depleted mice was abrogated by depletion of CD8+ T cells. Lung metastases were significantly decreased by treatment of mice with an IL-13 inhibitor, but not by deficiency or inhibition of IL-4. Thus, even for a nonregressor tumor, immunosurveillance exists but is negatively regulated via CD4+ NKT cells possibly mediated by IL-13, and can be unmasked by removal of these negative regulatory components.
authors.affiliation: Vaccine Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: Jong Myun
authors.initials: JM
authors.lastname: Park
authors.forename: Masaki
authors.initials: M
authors.lastname: Terabe
authors.forename: Leon T
authors.initials: LT
authors.lastname: van den Broeke
authors.forename: Debra D
authors.initials: DD
authors.lastname: Donaldson
authors.forename: Jay A
authors.initials: JA
authors.lastname: Berzofsky
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003110:Colonic Neoplasms / Q000276:immunology* / Q000473:pathology; D005260:Female; D018793:Interleukin-13 / Q000037:antagonists & inhibitors / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology*; D008175:Lung Neoplasms / Q000276:immunology* / Q000556:secondary; D051379:Mice; D008807:Mice, Inbred BALB C; D015166:Monitoring, Immunologic
chemical_list: D018793:Interleukin-13