title: Role of E2F1 in endoplasmic reticulum stress signaling.
abstract: The transcription factor E2F1 coordinates cell cycle progression and induces apoptosis in response to DNA damage stress. Aside from DNA damage, the role of E2F1 in the endoplasmic reticulum (ER) stress signaling pathways is unclear. We found that E2F1-/- murine embryonic fibroblasts (MEFs) are resistant to apoptosis triggered by the ER stress inducer thapsigargin. In addition, E2F1 deficiency results in enhanced phosphorylation of eukaryotic translation initiation factor 2a (eIF2a). These results therefore indicate that E2F1 deficiency increases phosphorylation of eIF2a in response to ER stress triggered by thapsigargin, and suggest that the reduction in ER stress-induced apoptosis in E2F1-deficient cells is related to the high level of eIF2a phosphorylation.
authors.affiliation: Functional Genomics Research Center, Division of Molecular Therapeutics, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-333, Korea.
authors.forename: Kyung Mi
authors.initials: KM
authors.lastname: Park
authors.forename: Dong Joon
authors.initials: DJ
authors.lastname: Kim
authors.forename: Sang Gi
authors.initials: SG
authors.lastname: Paik
authors.forename: Soo Jung
authors.initials: SJ
authors.lastname: Kim
authors.forename: Young Il
authors.initials: YI
authors.lastname: Yeom
mesh_terms: D000818:Animals; D017209:Apoptosis; D050687:E2F1 Transcription Factor / Q000235:genetics / Q000502:physiology*; D004622:Embryo, Mammalian / Q000166:cytology / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000187:drug effects / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D010766:Phosphorylation / Q000187:drug effects; D015398:Signal Transduction; D019284:Thapsigargin / Q000494:pharmacology
chemical_list: D050687:E2F1 Transcription Factor; C493754:E2f1 protein, mouse; D019284:Thapsigargin