title: Positive and negative selection of Tcrb-V6+ T cells.
abstract: Tcrb-V6+ T cells are deleted by an endogenous superantigen probably encoded by a mouse mammary tumor provirus (Mtv), Mtv-7, in association with major histocompatibility complex (MHC) class II molecules. In contrast, Tcrb-V6+CD4+ T cells are positively selected by MHC class II E molecules in Mtv-7- mice. We have examined the levels of Tcrb-V6+CD4+ and Tcrb-V6+CD8+ T cells from six combinations of backcross mice. In this paper we show that: 1) Tcrb-V6+CD8+ T cells can be positively selected by MHC class I molecules; 2) MHC class II A molecules can also influence the levels of Tcrb-V6+CD4+ T cells; 3) Mtv-7- NZW mice have a new Mtv, Mtv-44, which cosegregates with a gene encoding the partial deletion ligand for Tcrb-V6+ T cells; 4) the remaining Tcrb-V6+ T cells from mice with partial deletion of these T cells appear not to be anergized in the periphery.
authors.affiliation: Transplantation Biology Section, MRC Clinical Research Centre, Harrow, Middlesex, England.
authors.forename: K
authors.initials: K
authors.lastname: Tomonari
authors.forename: S
authors.initials: S
authors.lastname: Fairchild
mesh_terms: D000818:Animals; D015139:Blotting, Southern; D015704:CD4 Antigens / Q000235:genetics / Q000276:immunology; D016827:CD8 Antigens / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D002872:Chromosome Deletion; D003433:Crosses, Genetic; D005434:Flow Cytometry; D005814:Genes, Viral; D006183:H-2 Antigens / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000235:genetics; D008213:Lymphocyte Activation; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D006183:H-2 Antigens; D015395:Histocompatibility Antigens Class I