title: Colonic lamina propria dendritic cells in mice with CD4+ T cell-induced colitis.
abstract: CD11c(+) (F4/80(-) CD68(-)) dendritic cells (DC) in the colonic lamina propria (cLP) of normal and immunodeficient (RAG1(-/-)) C57BL/6 (B6) mice show high surface expression of MHC class I/II molecules and CD1d, and low surface expression of CD40, CD80, CD86 costimulator molecules. CD4(+) alpha beta T cells from normal or MHC class II-deficient B6 mice transferred into congenic RAG1(-/-) hosts induce a progressive, lethal colitis. Concomitant with colitis development, DC in the inflamed cLP increase in number and up-regulate surface expression of CD1d, MHC class II molecules and CD40, CD80, CD86 costimulator molecules. cLP DC from non-transplanted (healthy) and transplanted (diseased) mice produce similar amounts of IL-12 p70 and IL-10 in response to CD40 signaling, but the inducible IL-12 p40 release is 5-15-fold higher in mice with colitis than in non-transplanted mice. Binding of IL-12 p40 to p19 generates IL-23. Freshly isolated cLP lymphocytes (cLPL) from transplanted, diseased mice express 3-10-fold more p19 transcripts than cLPL from non-transplanted, healthy mice. p19 expression by cLPL is further up-regulated in response to CD40 ligation. Freshly isolated cLP DC from transplanted mice with colitis (but not from non-transplanted controls) stimulate IFN-gamma (but not IL-4 or IL-13) release by co-cultured NKT cells. Incolitis, DC accumulate in the cLP, show an activated surface phenotype, up-regulate IL-12 p40 and p19 expression, and 'spontaneously' stimulate NKT-like cells. cLP DC may be interesting targets for novel therapeutic approaches to modulate mucosal T cell responses in situ.
authors.affiliation: Department of Medical Microbiology and Immunology, University of Ulm, Ulm, Germany.
authors.forename: Tamara
authors.initials: T
authors.lastname: Krajina
authors.forename: Frank
authors.initials: F
authors.lastname: Leithäuser
authors.forename: Peter
authors.initials: P
authors.lastname: Möller
authors.forename: Zlatko
authors.initials: Z
authors.lastname: Trobonjaca
authors.forename: Jörg
authors.initials: J
authors.lastname: Reimann
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000637:transplantation; D002478:Cells, Cultured; D003092:Colitis / Q000276:immunology* / Q000473:pathology; D003106:Colon / Q000033:anatomy & histology / Q000166:cytology / Q000276:immunology*; D016207:Cytokines / Q000378:metabolism; D003713:Dendritic Cells / Q000145:classification / Q000276:immunology*; D016654:Genes, RAG-1; D016130:Immunophenotyping; D015212:Inflammatory Bowel Diseases / Q000276:immunology / Q000473:pathology; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000096:biosynthesis; D053762:Interleukin-12 Subunit p40; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins / Q000502:physiology; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D021122:Protein Subunits / Q000096:biosynthesis
chemical_list: D016207:Cytokines; C508841:Il23a protein, mouse; D053762:Interleukin-12 Subunit p40; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins; D021122:Protein Subunits; D018664:Interleukin-12; D007371:Interferon-gamma