title: Circulating conventional and plasmacytoid dendritic cell subsets display distinct kinetics during in vivo repeated allergen skin challenges in atopic subjects.
abstract: Upon allergen challenge, DC subsets are recruited to target sites under the influence of chemotactic agents; however, details pertinent to their trafficking remain largely unknown. We investigated the kinetic profiles of blood and skin-infiltrating DC subsets in twelve atopic subjects receiving six weekly intradermal allergen and diluent injections. The role of activin-A, a cytokine induced in allergic and tissue repair processes, on the chemotactic profiles of DC subsets was also examined. Plasmacytoid (pDCs) and conventional DCs (cDCs) were evaluated at various time-points in the blood and skin. In situ activin-A expression was assessed in the skin and its effects on chemokine receptor expression of isolated cDCs were investigated. Blood pDCs were reduced 1 h after challenge, while cDCs decreased gradually within 24 h. Skin cDCs increased significantly 24 h after the first challenge, inversely correlating with blood cDCs. Activin-A in the skin increased 24 h after the first allergen challenge and correlated with infiltrating cDCs. Activin-A increased the CCR10/CCR4 expression ratio in cultured human cDCs. DC subsets demonstrate distinct kinetic profiles in the blood and skin especially during acute allergic inflammation, pointing to disparate roles depending on each phase of the inflammatory response. The effects of activin-A on modulating the chemotactic profile of cDCs suggest it may be a plausible therapeutic target for allergic diseases.
authors.affiliation: 7th Respiratory Department and Asthma Centre, Athens Chest Hospital, Athens 11527, Greece ; Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Stelios
authors.initials: S
authors.lastname: Vittorakis
authors.affiliation: 7th Respiratory Department and Asthma Centre, Athens Chest Hospital, Athens 11527, Greece ; Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Konstantinos
authors.identifier: 0000-0002-9921-9859
authors.initials: K
authors.lastname: Samitas
authors.affiliation: Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Sofia
authors.identifier: 0000-0002-9040-8856
authors.initials: S
authors.lastname: Tousa
authors.affiliation: 7th Respiratory Department and Asthma Centre, Athens Chest Hospital, Athens 11527, Greece.
authors.forename: Eleftherios
authors.identifier: 0000-0001-7436-4550
authors.initials: E
authors.lastname: Zervas
authors.affiliation: Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Maria
authors.initials: M
authors.lastname: Aggelakopoulou
authors.affiliation: Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Maria
authors.identifier: 0000-0002-0318-6774
authors.initials: M
authors.lastname: Semitekolou
authors.affiliation: Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Vily
authors.identifier: 0000-0002-1569-1508
authors.initials: V
authors.lastname: Panoutsakopoulou
authors.affiliation: Cellular Immunology Laboratory, Division of Cell Biology, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, Athens 11527, Greece.
authors.forename: Georgina
authors.identifier: 0000-0001-7944-2343
authors.initials: G
authors.lastname: Xanthou
authors.affiliation: 7th Respiratory Department and Asthma Centre, Athens Chest Hospital, Athens 11527, Greece.
authors.forename: Mina
authors.identifier: 0000-0002-9949-6012
authors.initials: M
authors.lastname: Gaga
mesh_terms: D028341:Activins / Q000097:blood / Q000276:immunology; D000293:Adolescent; D000328:Adult; D000485:Allergens / Q000633:toxicity*; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D003876:Dermatitis, Atopic / Q000097:blood / Q000276:immunology* / Q000473:pathology; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects / Q000276:immunology; D006801:Humans; D007249:Inflammation / Q000097:blood / Q000276:immunology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010950:Plasma Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D054447:Receptors, CCR10 / Q000097:blood / Q000276:immunology; D054398:Receptors, CCR4 / Q000097:blood / Q000276:immunology; D012867:Skin / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D012882:Skin Tests
chemical_list: D000485:Allergens; C515706:CCR10 protein, human; C515354:CCR4 protein, human; D054447:Receptors, CCR10; D054398:Receptors, CCR4; C422405:activin A; D028341:Activins