title: TRAIL-induced apoptosis and gene induction in HaCaT keratinocytes: differential contribution of TRAIL receptors 1 and 2.
abstract: Tumor necrosis factor related apoptosis-inducing ligand (TRAIL) exerts a potent cytotoxic activity especially against many tumor cell types such as transformed keratinocytes. The specific role of the different TRAIL receptors in this process, however, is unknown. In this report we examine the role the TRAIL receptors play in both the apoptotic and nonapoptotic responses of HaCaT keratinocytes to leucine zipper TRAIL (LZ-TRAIL). By employing receptor-specific blocking antibodies we demonstrate that TRAIL receptor 1 plays the primary role in mediating caspase activation and apoptosis in HaCaT cells. Furthermore, we show that this receptor mainly mediates nuclear factor kappaB activation and expression of the pro-inflammatory cytokine interleukin-8 and that nuclear factor kappaB activation is critically required for the induction of pro-inflammatory cytokines in response to LZ-TRAIL. Taken together, our data suggest that beside its potent pro-apoptotic role, LZ-TRAIL leads to pro-inflammatory responses that are mainly mediated by TRAIL receptor 1 in HaCaT keratinocytes.
authors.affiliation: University of Würzburg Medical School, Department of Dermatology, Würzburg, Germany. leverkus_m@klinik.uni-wuerzburg.de
authors.forename: Martin
authors.initials: M
authors.lastname: Leverkus
authors.forename: Martin R
authors.initials: MR
authors.lastname: Sprick
authors.forename: Tina
authors.initials: T
authors.lastname: Wachter
authors.forename: Andrea
authors.initials: A
authors.lastname: Denk
authors.forename: Eva-Bettina
authors.initials: EB
authors.lastname: Bröcker
authors.forename: Henning
authors.initials: H
authors.lastname: Walczak
authors.forename: Manfred
authors.initials: M
authors.lastname: Neumann
mesh_terms: D017209:Apoptosis / Q000276:immunology*; D051017:Apoptosis Regulatory Proteins; D002461:Cell Line, Transformed; D002633:Chemotaxis / Q000502:physiology; D003872:Dermatitis / Q000276:immunology / Q000378:metabolism / Q000503:physiopathology; D005786:Gene Expression Regulation; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D016209:Interleukin-8 / Q000235:genetics / Q000378:metabolism; D015603:Keratinocytes / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D016350:Leucine Zippers / Q000502:physiology; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism*; D012795:Sialoglycoproteins / Q000235:genetics; D015398:Signal Transduction / Q000502:physiology; D053221:TNF-Related Apoptosis-Inducing Ligand; D015533:Transcriptional Activation; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism*
chemical_list: D051017:Apoptosis Regulatory Proteins; C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D016209:Interleukin-8; D008562:Membrane Glycoproteins; D016328:NF-kappa B; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D012795:Sialoglycoproteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha