title: In vivo CD4+ lymph node T cells from lpr mice generate CD4-CD8-B220+TCR-beta low cells.
abstract: Double-negative CD4-CD8-T cells (DNT) have been shown to be the major population of T cells responsible for the massive lymphadenopathy associated with the early onset of the lupus-like syndrome in mice bearing the lpr gene. Previously, we demonstrated that these cells do not proliferate in the peripheral lymphoid organs that they invade; furthermore, we showed that a wide range of CD4 Ag expression was observed on lymph node CD4+ T cells. In this study, we used an in vivo transfer system to analyze the progeny of CD4+ T cells from B6-lpr/lpr mice. Purified CD4+ T cells injected into B6 nude mice are able to generate DNT cells; furthermore, phenotypic and functional characterizations of the DNT cells generated in vivo show that they share the same properties as DNT cells from B6-lpr/lpr mice. We also show that, after in vitro bromodeoxyuridine incorporation, only CD4+ cells cycle. From these studies, we conclude that the lymphoproliferation occurs at the CD4+ stage and that down-regulation of this Ag probably is followed by arrest of the cell cycle.
authors.affiliation: INSERM, Unit 345, Necker Institute, Paris, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Laouar
authors.forename: S
authors.initials: S
authors.lastname: Ezine
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000096:biosynthesis* / Q000276:immunology; D001973:Bromodeoxyuridine / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000637:transplantation; D005260:Female; D005434:Flow Cytometry; D017493:Leukocyte Common Antigens; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology*; D008213:Lymphocyte Activation; D008232:Lymphoproliferative Disorders / Q000235:genetics / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D008819:Mice, Nude; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis* / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D016693:Receptors, Antigen, T-Cell, alpha-beta; D017493:Leukocyte Common Antigens; D001973:Bromodeoxyuridine