title: Protective effects of cyclooxygenase-2 inhibitors on narrow-band ultraviolet B-irradiated epidermal Ia+ Langerhans cells and Thy-1+ dendritic epidermal T cells in mice.
abstract: Cyclooxygenase (COX)-2 inhibitors are known to be used as chemopreventative agents against certain malignancies. Thus far, there has been very limited information on whether COX-2 inhibitors protect against chronic narrow-band UVB (NB-UVB)-induced immunosuppression. The present study investigated the effect of nonselective and specific COX-2 inhibitors, indomethacin and celecoxib, on epidermal Ia+ Langerhans cells (LCs) and Thy-1+ dendritic epidermal T cells (DETCs) in mice irradiated with NB-UVB. Sixty female BALB/c mice were divided randomly into the control group (sham) and the experimental groups (irradiated with NB-UVB for 17 weeks, further divided into five groups according to the diets containing different concentrations of either COX-2 inhibitors). Alterations in the density and morphology of epidermal Ia+ LCs and Thy-1+ DETCs in mice were documented using fluorescence microscopy. Chronic NB-UVB irradiation substantially decreased the density and altered the morphology of the epidermal Ia+ LCs and Thy-1+ DETCs in control mice. The dietary supplementation of both COX-2 inhibitors displayed a dosage-dependent protective effect on the murine dendritic cells irradiated by NB-UVB. In conclusion, COX-2 inhibitors protected against chronic NB-UVB-induced density and morphologic changes in epidermal Ia+ LCs and Thy-1+ DETCs in mice.
authors.affiliation: Department of Dermatology, No. 1 Hospital of China Medical University, Shenyang, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Chang-Long
authors.initials: CL
authors.lastname: Tai
authors.forename: Huachen
authors.initials: H
authors.lastname: Wei
authors.forename: Fang
authors.initials: F
authors.lastname: He
authors.forename: Yakun
authors.initials: Y
authors.lastname: Wang
authors.forename: Yuming
authors.initials: Y
authors.lastname: Zhao
authors.forename: Hong-Duo
authors.initials: HD
authors.lastname: Chen
mesh_terms: D000818:Animals; D000068579:Celecoxib; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D004817:Epidermis / Q000187:drug effects / Q000528:radiation effects*; D005260:Female; D007213:Indomethacin / Q000494:pharmacology*; D007515:Islets of Langerhans / Q000187:drug effects / Q000528:radiation effects*; D007801:Langerhans Cells / Q000187:drug effects / Q000528:radiation effects*; D051379:Mice; D008807:Mice, Inbred BALB C; D011720:Pyrazoles / Q000494:pharmacology*; D013449:Sulfonamides / Q000494:pharmacology*; D014466:Ultraviolet Rays
chemical_list: D016861:Cyclooxygenase Inhibitors; D011720:Pyrazoles; D013449:Sulfonamides; D000068579:Celecoxib; D007213:Indomethacin