title: Type I interferon regulates pDC maturation and Ly49Q expression.
abstract: Ly49Q is expressed on peripheral mouse plasmacytoid dendritic cells (pDC). Immature Ly49Q-negative pDC precursors acquire Ly49Q in the bone marrow and then migrate into the periphery. While searching for molecules that regulate pDC maturation, we found that type I interferon (IFN) inhibited Ly49Q acquisition in vitro. Infections that induce type I IFN production by cells other than pDC (a condition mimicked by poly(I:C) injection in vivo) increase the prevalence of Ly49Q(-) pDC in the bone marrow and peripheral lymphoid organs in wild-type but not IFN-alpha/beta receptor knockout BALB/c mice. Moreover, in vivo exposure to type I IFN causes some Ly49Q(-), but not Ly49Q(+), pDC to convert to conventional DC, defined as B220(-) CD11c(+) CD11b(+) cells. These data suggest that type I IFN regulates pDC development and affects their distribution in the body.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Makiko
authors.initials: M
authors.lastname: Toma-Hirano
authors.forename: Sahori
authors.initials: S
authors.lastname: Namiki
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Miyatake
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Arai
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Kamogawa-Schifter
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000096:biosynthesis* / Q000235:genetics; D002454:Cell Differentiation / Q000276:immunology*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology* / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000276:immunology; D007370:Interferon Type I / Q000502:physiology*; D037181:Lectins, C-Type / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D055650:NK Cell Lectin-Like Receptor Subfamily A; D055630:Receptors, NK Cell Lectin-Like