title: Ultraviolet B irradiation modulates susceptibility to tumour necrosis factor-alpha-induced apoptosis via induction of death receptors in murine fibroblasts.
abstract: Ultraviolet B (UVB) irradiation causes cell death by apoptosis in murine fibroblast cells. Tumor necrosis factor-alpha (TNF-alpha) is also a well known inducer of apoptosis, although the physiological significance of this activity is poorly understood. We investigated the effects of pretreatment with UVB (312 nm) on TNF-alpha-induced apoptosis in murine fibroblast cells. UVB enhanced susceptibility to cell death by TNF-alpha in a dose-dependent manner. UVB but not TNF-alpha induced the expression of TNF receptor type-1 (TNFR-1) and type-2 (TNFR-2) in a dose-dependent manner. Expression of Fas (CD95) and Fas-ligand (Fas-L), and significant DNA fragmentation were observed in the cells that died. These results suggest that UVB irradiation modulates susceptibility to TNF-alpha-induced apoptosis through the induction of TNFRs, Fas, and Fas-L in murine fibroblasts.
authors.affiliation: Department of Biological Sciences, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kimura
authors.forename: H
authors.initials: H
authors.lastname: Minakami
authors.forename: A
authors.initials: A
authors.lastname: Shoji
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000378:metabolism*; D017209:Apoptosis / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured / Q000187:drug effects / Q000528:radiation effects; D053938:DNA Fragmentation; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D053222:Fas Ligand Protein; D005347:Fibroblasts / Q000187:drug effects* / Q000378:metabolism / Q000528:radiation effects*; D008562:Membrane Glycoproteins / Q000378:metabolism; D051379:Mice; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism*; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D014466:Ultraviolet Rays; D019014:fas Receptor / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D008562:Membrane Glycoproteins; D018124:Receptors, Tumor Necrosis Factor; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor