title: GADD34 induces p21 expression and cellular senescence.
abstract: We previously identified GADD34 (growth arrest and DNA damage protein 34) by screening for genes involved in oncogenic-transformation and/or cellular senescence in Ras-transformed rat F2408 fibroblasts (7EJ-Ras), which exhibit anchorage-independent growth and do not senesce. In the current study, we found that transduction of 7EJ-Ras cells with a retroviral vector expressing GADD34 suppressed their proliferation. Furthermore, we observed that fibroblasts derived from GADD34-knockout mice (GADD34-KO MEFs) did not undergo senescence. Whereas the expression of p21 was decreased in GADD34 KO MEFs, its expression was rescued in these cells by ectopic expression of GADD34 by retroviral transduction. These findings suggest that GADD34 contributes to the regulation of p21 expression, and that it suppresses cellular proliferation through the induction of cellular senescence.
authors.affiliation: Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Shiga 520-2192, Japan.
authors.forename: Kahori
authors.initials: K
authors.lastname: Minami
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Inoue
authors.forename: Takao
authors.initials: T
authors.lastname: Terashita
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kawakami
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Watanabe
authors.forename: Masataka
authors.initials: M
authors.lastname: Haneda
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Isobe
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Okabe
authors.forename: Tokuhiro
authors.initials: T
authors.lastname: Chano
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000235:genetics / Q000502:physiology*; D018797:Cell Cycle Proteins / Q000235:genetics / Q000502:physiology*; D002460:Cell Line; D049109:Cell Proliferation; D016922:Cellular Senescence / Q000235:genetics*; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism; D011905:Genes, ras / Q000235:genetics; D051379:Mice; D018345:Mice, Knockout; D009369:Neoplasms / Q000235:genetics / Q000473:pathology*; D054645:Protein Phosphatase 1; D051381:Rats; D012190:Retroviridae / Q000235:genetics; D014161:Transduction, Genetic
chemical_list: D000943:Antigens, Differentiation; D018797:Cell Cycle Proteins; D050759:Cyclin-Dependent Kinase Inhibitor p21; C513256:Ppp1r15a protein, mouse; D054645:Protein Phosphatase 1