title: CD4+CD8+ cells lacking self-Mls reactive T cells are induced in mesenteric lymph nodes of Salmonella enteritidis-infected mice.
abstract: The percentage of mesenteric lymph node (MLN) cells that co-expressed both CD4 and CD8 was found to be from 5 to 7% in BALB/c and AKR/N mice bred under conventional conditions. In mice maintained under specific pathogen-free (SPF) conditions, the percentage fell below 2%. When mice were infected with an attenuated strain of Salmonella enteritidis (SER), the percentage of CD4+CD8+ cells in MLN rose to 20-30% transiently. In these mice, the total cell number and the percentage of CD8+ cells were not changed, but the CD4+ cell percentage was decreased. The expression intensity of TCR-alpha beta on CD4+CD8+ cells in the infected mice was higher in the MLN than in the thymus, but was similar to that of mature peripheral T cells. Among the CD4+CD8+ cell population in MLN, TCR-V beta 3+ cells were deleted but V beta 6+ cells were present in BALB/c mice which possess endogenous superantigen Mls-2a, but lack Mls-la. In AKR mice with the inverse of the occurrence of the superantigens, TCR-V beta 3+ cells were present and V beta 6+ cells were absent. These data suggest that CD4+CD8+ cells in the MLN of SER-infected mice may belong to thymus-derived mature T cells undergoing negative selection and that they may appear following exogenous stimulation.
authors.affiliation: Department of Microbiology, Kitasatao University School of Medicine, Sagamihara-shi, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tamauchi
authors.forename: T
authors.initials: T
authors.lastname: Sasahara
authors.forename: S
authors.initials: S
authors.lastname: Habu
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D008198:Lymph Nodes / Q000276:immunology*; D008643:Mesentery; D051379:Mice; D008806:Mice, Inbred AKR; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D016747:Minor Lymphocyte Stimulatory Antigens / Q000276:immunology*; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology; D012481:Salmonella Infections, Animal / Q000276:immunology*; D012477:Salmonella enteritidis / Q000276:immunology*; D013047:Specific Pathogen-Free Organisms; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D016747:Minor Lymphocyte Stimulatory Antigens; D016693:Receptors, Antigen, T-Cell, alpha-beta