title: Mouse CD11c(+) B220(+) Gr1(+) plasmacytoid dendritic cells develop independently of the T-cell lineage.
abstract: The developmental origin of dendritic cells (DCs) is controversial. In the mouse CD8alpha(+) and CD8alpha(-) DC subsets are often considered to be of lymphoid and myeloid origin respectively, although evidence on this point is conflicting. Very recently a novel CD11c(+) B220(+) DC subset has been identified that appears to be the murine counterpart to interferon alpha (IFNalpha)-producing human plasmacytoid DCs (PDCs). We show here that CD11c(+) B220(+) mouse PDCs, like human PDCs, are present in the thymus and express T lineage markers such as CD8alpha and CD4. However, the intrathymic development of PDCs can be completely dissociated from immature T lineage cells in mixed chimeras established with bone marrow cells from mice deficient for either Notch-1 or T-cell factor 1, two independent mutations that severely block early T-cell development. Our data indicate that thymic PDCs do not arise from a bipotential T/DC precursor.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology; D039521:CD11c Antigen / Q000097:blood*; D002678:Chimera / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology*; D006801:Humans; D017493:Leukocyte Common Antigens / Q000097:blood*; D051379:Mice; D008810:Mice, Inbred C57BL; D023421:Models, Animal; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D039521:CD11c Antigen; D017493:Leukocyte Common Antigens