title: Immunoregulatory function of CD3+, CD4-, and CD8- T cells. Gamma delta T cell receptor-positive T cells from nude mice abrogate oral tolerance.
abstract: Previous work has shown that abrogation of oral tolerance is mediated by T cells which are found in the CD3+, L3T4- (CD4-), and Lyt-2- (CD8-) subset (termed double-negative; DN) in mice. Inasmuch as it is known that athymic, nude (nu/nu) mice possess Thy 1+, CD4-, and CD8- T cells which also exhibit a functionally rearranged TCR gamma-chain, we investigated whether this subset of nude T cells contained functional immunoregulatory cells. In this report, we examined the phenotype and distribution of CD3+ T cells in the spleen and in the mesenteric and peripheral lymph nodes of BALB/c nu/nu mice in comparison with normal mice (+/+). In the spleens of nude mice, the predominant CD3+ T cell subpopulation was DN. Further, in mesenteric and peripheral lymph nodes, approximately one-third and one-half of the CD3+ T cells were double negative, respectively. In contrast, CD3+, DN T cells represent a small subpopulation in normal (+/+) mice. We next showed that functional regulatory T cells which possess the ability to abrogate oral tolerance were induced in nu/nu mice by Ag priming. BALB/c nude mice were immunized with SRBC, and the splenic CD3+, Vicia villosa-adherent cells were obtained by panning. Adoptive transfer of CD3+, V. villosa-adherent T cells to orally tolerant BALB/c mice restored responsiveness to SRBC, whereas V. villosa nonadherent cells were without effect. In other experiments, CD3+ T cells from the spleens of SRBC-primed mice were further enriched for the CD5+, DN phenotype and adoptive transfer of this subset completely abrogated oral tolerance to SRBC. To characterize the nature of the TCR expressed on these CD3+, DN T cells, we developed a rabbit antibody to a synthetic peptide (residues 209-218: Tyr-Ala-Asn-Ser-Phe-Asn-Asn-Glu-Lys-Leu) which was synthesized from a deduced sequence of the murine delta-gene. Immunoprecipitation of a cell membrane fraction from CD3+, DN T cells with anti-delta TCR antibody isolated a 45-kDa band. Furthermore, immunoprecipitation of these cells with anti-CD3 (145-2C11) revealed bands at 45 and 35 kDa (corresponding to delta- and gamma-chains, respectively). Taken together, these results are the first to show that gamma delta-TCR bearing CD3+, CD4-, and CD8- T cells are functional and reverse oral tolerance when adoptively transferred.
authors.affiliation: Department of Oral Biology, University of Alabama, Birmingham 35294.
authors.forename: K
authors.initials: K
authors.lastname: Fujihashi
authors.forename: H
authors.initials: H
authors.lastname: Kiyono
authors.forename: W K
authors.initials: WK
authors.lastname: Aicher
authors.forename: D R
authors.initials: DR
authors.lastname: Green
authors.forename: B
authors.initials: B
authors.lastname: Singh
authors.forename: J H
authors.initials: JH
authors.lastname: Eldridge
authors.forename: J R
authors.initials: JR
authors.lastname: McGhee
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D017252:CD3 Complex; D015704:CD4 Antigens / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D016827:CD8 Antigens; D017707:Erythrocyte Transfusion; D007108:Immune Tolerance; D007116:Immunization, Passive; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010641:Phenotype; D011948:Receptors, Antigen, T-Cell / Q000032:analysis / Q000276:immunology / Q000502:physiology*; D012756:Sheep; D013154:Spleen; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology* / Q000378:metabolism
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; D011948:Receptors, Antigen, T-Cell