title: Depressed Langerhans cell migration and reduced contact hypersensitivity response in mice lacking TNF receptor p75.
abstract: Epidermal Langerhans cells (LC) belong to the dendritic cell family and represent the major APC within the skin. LC capture epicutaneous Ag, migrate into regional lymph nodes, and present Ag to T cells, thereby initiating primary immune response. The migratory properties of LC are an essential component of their function. The molecular mechanisms responsible for LC migration are far less defined. However, evidence has been accumulating to suggest that TNF-alpha, a major proinflammatory cytokine, plays an important role in promoting DC migration. To confirm the role of TNF-alpha in LC migration and to examine which type of TNF receptor signaling is involved in such an event, we utilized gene-targeted knockout mice lacking TNF receptor p55 or p75. The migration of LC was assessed by examining the frequency of hapten-bearing cells in draining lymph nodes following hapten FITC painting, and the accumulation of dendritic cells in draining lymph nodes after intradermal injection of TNF-alpha. While LC migration was normal in p55-deficient mice, the migration was markedly depressed in p75-deficient mice. Receptor p75-deficient mice also demonstrated a hyporesponsiveness in allergen-induced contact dermatitis, but a normal responsiveness in irritant-induced contact dermatitis. These results suggest that p75-dependent signaling plays a crucial role in the migration of LC and in the initiation of cutaneous immune responses.
authors.affiliation: Division of Dermatology, Sunnybrook Health Science Centre, University of Toronto, ON, Canada.
authors.forename: B
authors.initials: B
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Fujisawa
authors.forename: L
authors.initials: L
authors.lastname: Zhuang
authors.forename: S
authors.initials: S
authors.lastname: Kondo
authors.forename: G M
authors.initials: GM
authors.lastname: Shivji
authors.forename: C S
authors.initials: CS
authors.lastname: Kim
authors.forename: T W
authors.initials: TW
authors.lastname: Mak
authors.forename: D N
authors.initials: DN
authors.lastname: Sauder
mesh_terms: D000279:Administration, Cutaneous; D000485:Allergens / Q000008:administration & dosage; D000818:Animals; D015703:Antigens, CD / Q000235:genetics* / Q000378:metabolism; D002452:Cell Count; D002465:Cell Movement / Q000235:genetics / Q000276:immunology*; D003713:Dendritic Cells / Q000473:pathology; D003877:Dermatitis, Contact / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D004817:Epidermis / Q000473:pathology; D016650:Fluorescein-5-isothiocyanate / Q000008:administration & dosage; D006241:Haptens / Q000276:immunology; D007509:Irritants / Q000008:administration & dosage; D007801:Langerhans Cells / Q000276:immunology* / Q000473:pathology; D008198:Lymph Nodes / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D012333:RNA, Messenger / Q000096:biosynthesis; D018124:Receptors, Tumor Necrosis Factor / Q000235:genetics* / Q000378:metabolism; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics; D015854:Up-Regulation / Q000276:immunology
chemical_list: D000485:Allergens; D015703:Antigens, CD; D006241:Haptens; D007509:Irritants; D012333:RNA, Messenger; D018124:Receptors, Tumor Necrosis Factor; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D014409:Tumor Necrosis Factor-alpha; D016650:Fluorescein-5-isothiocyanate