title: Induction of the TRAIL receptor KILLER/DR5 in p53-dependent apoptosis but not growth arrest.
abstract: The TRAIL death receptor KILLER/DR5 is induced by DNA damaging agents in wild-type p53-expressing cells. Here we show that, unlike the p53-target CDK-inhibitor p21WAF1/CIP1, the TRAIL death receptor KILLER/DR5 is only induced in cells undergoing p53-dependent apoptosis and not cell cycle arrest. Thus GM glioblastoma cells carrying an inducible MMTV-driven p53 gene undergo cell cycle arrest and upregulate p21 but not KILLER/DR5 expression upon dexamethasone exposure. WI38 normal lung fibroblasts undergoing cell cycle arrest in response to ionizing irradiation also induce p21 but not KILLER/DR5 gene expression. KILLER/DR5 upregulation is also deficient in irradiated lymphoblastoid cells derived from patients with Ataxia Teleangiectasia suggesting a role for the ATM-p53 pathway in regulating KILLER/DR5 expression after DNA damage. Inhibition of transcription by Actinomycin D blocks both KILLER/DR5 and p21 induction in cells undergoing p53-dependent apoptosis. Our results suggest that the p53-dependent transcriptional induction of KILLER/DR5 death receptor is restricted to cells undergoing apoptosis and not cells undergoing exclusively p53-dependent G1 arrest.
authors.affiliation: Department of Medicine, Howard Hughes Medical Institute, University of Pennsylvania School of Medicine Philadelphia 19104, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Wu
authors.forename: T F
authors.initials: TF
authors.lastname: Burns
authors.forename: E R
authors.initials: ER
authors.lastname: McDonald
authors.forename: R D
authors.initials: RD
authors.lastname: Meng
authors.forename: G
authors.initials: G
authors.lastname: Kao
authors.forename: R
authors.initials: R
authors.lastname: Muschel
authors.forename: T
authors.initials: T
authors.lastname: Yen
authors.forename: W S
authors.initials: WS
authors.lastname: el-Deiry
mesh_terms: D017209:Apoptosis / Q000502:physiology*; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins; D002455:Cell Division / Q000502:physiology*; D002460:Cell Line; D004268:DNA-Binding Proteins; D006801:Humans; D017346:Protein Serine-Threonine Kinases / Q000502:physiology; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis*; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000502:physiology*; D025521:Tumor Suppressor Proteins
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; C505639:TNFRSF10B protein, human; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; C576324:ATM protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; D017346:Protein Serine-Threonine Kinases