title: Overexpression of Bcl-2 differentially restores development of thymus-derived CD4-8+ T cells and intestinal intraepithelial T cells in IFN-regulatory factor-1-deficient mice.
abstract: Mice lacking IFN-regulatory factor (IRF)-1 have reduced numbers of mature CD8+ T cells within the thymus and peripheral lymphoid organs, suggesting a critical role of IRF-1 in CD8(+) T cell differentiation. Here we show that endogenous Bcl-2 expression is substantially reduced in IRF-1(-/-)CD8+ thymocytes and that introduction of a human Bcl-2 transgene driven by Emu or lck promoter in IRF-1(-/-) mice restores the CD8(+) T cell development. Restored CD8+ T cells are functionally mature in terms of allogeneic MLR and cytokine production. In contrast to thymus-derived CD8+ T cells, other lymphocyte subsets including NK, NK T, and TCR-gammadelta(+) intestinal intraepithelial lymphocytes, which are also impaired in IRF-1(-/-) mice, are not rescued by expressing human Bcl-2. Our results indicate that IRF-1 differentially regulates the development of these lymphocyte subsets and that survival signals involving Bcl-2 are critical for the development of thymus-dependent CD8+ T cells.
authors.affiliation: Department of Microbiology and Immunology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ohteki
authors.forename: C
authors.initials: C
authors.lastname: Maki
authors.forename: S
authors.initials: S
authors.lastname: Koyasu
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D002470:Cell Survival / Q000235:genetics / Q000276:immunology; D004268:DNA-Binding Proteins / Q000172:deficiency* / Q000235:genetics* / Q000502:physiology; D005786:Gene Expression Regulation / Q000276:immunology; D018014:Gene Transfer Techniques; D006801:Humans; D050856:Interferon Regulatory Factor-1; D007371:Interferon-gamma / Q000096:biosynthesis / Q000502:physiology; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D007694:Killer Cells, Natural / Q000276:immunology; D008213:Lymphocyte Activation / Q000235:genetics; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D010750:Phosphoproteins / Q000172:deficiency* / Q000235:genetics* / Q000502:physiology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000008:administration & dosage / Q000096:biosynthesis* / Q000235:genetics*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000096:biosynthesis; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D013950:Thymus Gland / Q000166:cytology* / Q000276:immunology; D019076:Transgenes / Q000276:immunology
chemical_list: D004268:DNA-Binding Proteins; C494257:IRF1 protein, human; D050856:Interferon Regulatory Factor-1; C494258:Irf1 protein, mouse; D010750:Phosphoproteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016692:Receptors, Antigen, T-Cell, gamma-delta; D007371:Interferon-gamma