title: Extralymphatic tumors prepare draining lymph nodes to invasion via a T-cell cross-tolerance process.
abstract: Metastases often develop in lymphoid organs. However, the immunologic mechanism allowing such invasion is not known because these organs are considered to be hostile to tumor cells. Here, we analyzed the interactions between tumor cells and CD8(+) T cells in such lymphoid organs. Tumor cells implanted into lymph nodes were able to induce tumor-specific cytotoxic CD8(+) T-cell responses, conducting to tumor rejection, in contrast to primary extralymphatic tumors rapidly anergizing T cells in draining lymph nodes (DLN) via a cross-presentation process. This abortive CD8(+) T-cell response to extralymphatic tumor is independent of the subcellular localization of antigen in tumor cells and is consistent with a lack of CD4(+) T-cell help. Notably, this anergy was potent enough to allow successful DLN implantation of tumor cells. Such distant cross-tolerization of tumor-specific CD8(+) T cells may be a determinant permissive event leading to invasion of DLN. In this situation, metastatic tumor cells do not need to down-regulate their immunogenicity to spread.
authors.affiliation: Louis Jeantet Skin Cancer Laboratory, Department of Dermatology, University Medical Center, Geneva, Switzerland.
authors.forename: Olivier
authors.initials: O
authors.lastname: Preynat-Seauve
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Contassot
authors.forename: Prisca
authors.initials: P
authors.lastname: Schuler
authors.forename: Vincent
authors.initials: V
authors.lastname: Piguet
authors.forename: Lars E
authors.initials: LE
authors.lastname: French
authors.forename: Bertrand
authors.initials: B
authors.lastname: Huard
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003429:Cross Reactions; D007108:Immune Tolerance; D008198:Lymph Nodes / Q000276:immunology* / Q000473:pathology; D008546:Melanoma, Experimental / Q000276:immunology* / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D009361:Neoplasm Invasiveness