title: Direct effects of glucocorticosteroids on epidermal Langerhans cells.
abstract: To determine the direct effects of glucocorticosteroids on epidermal Langerhans cells (LC), we treated isolated LC with dexamethasone (DEX) in vitro, and investigated Ia expression by LC using immunofluorescence microscopy and FACS analysis. We found that DEX directly decreased the number of Ia+ LC in a dose- and time-dependent manner. Pulse incubation with DEX also inhibited the immunostimulatory function of LC in vitro. FACS analysis demonstrated that LC detected in DEX-treated culture expressed a similar amount of Ia antigen and Fc receptor on the cell surface as LC cultured with the solvent control, suggesting that LC may be composed of a heterogeneous population in terms of sensitivity to DEX, and DEX may completely abolish the expression of surface molecules on a subpopulation of LC or may be cytolytic to this sensitive population.
authors.affiliation: Dermatology Branch, National Cancer Institute, Bethesda, MD 20892.
authors.forename: M
authors.initials: M
authors.lastname: Furue
authors.forename: S I
authors.initials: SI
authors.lastname: Katz
mesh_terms: D000818:Animals; D002469:Cell Separation; D002478:Cells, Cultured; D003907:Dexamethasone / Q000494:pharmacology; D000078404:Epidermal Cells; D004817:Epidermis / Q000187:drug effects*; D005434:Flow Cytometry; D005447:Fluocinonide / Q000494:pharmacology; D005455:Fluorescent Antibody Technique; D005938:Glucocorticoids / Q000494:pharmacology*; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D007801:Langerhans Cells / Q000187:drug effects* / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H
chemical_list: D005938:Glucocorticoids; D000949:Histocompatibility Antigens Class II; D005447:Fluocinonide; D003907:Dexamethasone