title: Altered lymph node composition in diphtheria toxin receptor-based mouse models to ablate dendritic cells.
abstract: Dendritic cells (DCs) are key regulators of innate and adaptive immunity. Our understanding of immune function has benefited greatly from mouse models allowing for selective ablation of DCs. Many such models rely on transgenic diphtheria toxin receptor (DTR) expression driven by DC-restricted promoters. This renders DCs sensitive to DT but is otherwise thought to have no effect on immune physiology. In this study, we report that, unexpectedly, mice in which DTR is expressed on conventional DCs display marked lymph node (LN) hypocellularity and reduced frequency of DCs in the same organs but not in spleen or nonlymphoid tissues. Intriguingly, in mixed bone marrow chimeras the phenotype conferred by DTR-expressing DCs is dominant over control bone marrow-derived cells, leading to small LNs and an overall paucity of DCs independently of the genetic ability to express DTR. The finding of alterations in LN composition and size independently of DT challenge suggests that caution must be exercised when interpreting results of experiments obtained with mouse models to inducibly deplete DCs. It further indicates that DTR, a member of the epidermal growth factor family, is biologically active in mice. Its use in cell ablation experiments needs to be considered in light of this activity.
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Janneke
authors.initials: J
authors.lastname: van Blijswijk
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Barbara U
authors.initials: BU
authors.lastname: Schraml
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Neil C
authors.initials: NC
authors.lastname: Rogers
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Paul G
authors.initials: PG
authors.lastname: Whitney
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Santiago
authors.initials: S
authors.lastname: Zelenay
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom.
authors.forename: Sophie E
authors.initials: SE
authors.lastname: Acton
authors.affiliation: Immunobiology Laboratory, Cancer Research UK, London Research Institute, London WC2A 3LY, United Kingdom caetano@cancer.org.uk.
authors.forename: Caetano
authors.initials: C
authors.lastname: Reis e Sousa
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology* / Q000276:immunology; D039521:CD11c Antigen / Q000378:metabolism; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D004167:Diphtheria Toxin / Q000276:immunology; D066257:Heparin-binding EGF-like Growth Factor / Q000096:biosynthesis / Q000276:immunology*; D037181:Lectins, C-Type / Q000235:genetics; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology / Q000473:pathology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D023421:Models, Animal; D011971:Receptors, Immunologic / Q000235:genetics; D013154:Spleen / Q000166:cytology / Q000276:immunology
chemical_list: D039521:CD11c Antigen; C529914:Clec9a protein, mouse; D004167:Diphtheria Toxin; D066257:Heparin-binding EGF-like Growth Factor; D037181:Lectins, C-Type; D011971:Receptors, Immunologic