title: Early expression of stem cell-associated genes within the CD8 compartment after treatment with a tumor vaccine.
abstract: Using a mouse neuroblastoma cell line, we have demonstrated that vaccination of tumor-free mice with a cell-based vaccine leads to productive immunity and resistance to tumor challenge, while vaccination of tumor-bearing mice does not. The T cell immunity induced by this vaccine, as measured by in vitro assays, is amplified by the depletion of Treg. Our goal is to understand this barrier to the development of protective cellular immunity. mRNA microarray analyses of CD8(+) T cells from naïve or tumor-bearing mice undergoing vaccination were carried out with or without administering anti-CD25 antibody. Gene-expression pathway analysis revealed the presence of CD8(+) T cells expressing stem cell-associated genes early after induction of productive anti-tumor immunity in tumor-free mice, prior to any phenotypic changes, but not in tumor-bearing mice. These data demonstrate that early after the induction of productive immune response, cells within the CD8(+) T cell compartment adopt a stem cell-related genetic phenotype that correlates with increased anti-tumor function.
authors.affiliation: Dept. Pediatrics, Section of Hematology Oncology, Medical College of Wisconsin, 8701 Watertown Plank Rd., Milwaukee, WI 53226, United States.
authors.forename: M Eric
authors.initials: ME
authors.lastname: Kohler
authors.forename: William H D
authors.initials: WH
authors.lastname: Hallett
authors.forename: Qing-Rong
authors.initials: QR
authors.lastname: Chen
authors.forename: Javed
authors.initials: J
authors.lastname: Khan
authors.forename: Bryon D
authors.initials: BD
authors.lastname: Johnson
authors.forename: Rimas J
authors.initials: RJ
authors.lastname: Orentas
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D019496:Cancer Vaccines / Q000235:genetics / Q000276:immunology*; D005434:Flow Cytometry; D020869:Gene Expression Profiling / Q000379:methods; D051379:Mice; D009447:Neuroblastoma / Q000276:immunology* / Q000628:therapy; D012334:RNA, Neoplasm / Q000737:chemistry / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000166:cytology / Q000276:immunology*; D016019:Survival Analysis; D014611:Vaccination
chemical_list: D019496:Cancer Vaccines; D012334:RNA, Neoplasm