title: p53-dependent stimulation of redox-related genes in the lymphoid organs of gamma-irradiated--mice identification of Haeme-oxygenase 1 as a direct p53 target gene.
abstract: Recent data showed that p53 stimulates the expression of genes encoding not only pro- but also antioxidant enzymes. It was suggested that antioxidant genes could be induced under physiologic levels of stress while the prooxidant ones respond to higher level of stress. Results presented in this article illustrate an additional degree of complexity. We show that the expression of Haeme-oxygenase 1 (HO-1), a stress-inducible gene that codes for an enzyme having antioxidant properties, is stimulated in a p53-dependent manner in the thymus and spleen of irradiated mice. We prove that HO-1 is a direct p53 target gene by showing that the p53RE identified within human and mouse genes is specifically bound by p53. The threshold of irradiation dose required to induce a significant response of HO-1 in the lymphoid organs of the irradiated mice is higher than that for Waf1/p21 that encodes an universal inhibitor of cell cycle. Moreover, induction of HO-1 occurs later than that of Waf1/p21. Finally, the higher stimulation of HO-1 is reached when Waf1/p21 stimulation starts to decrease.
authors.affiliation: Commissariat à l'Energie Atomique (CEA), Centre National de la Recherche Scientifique (CNRS), UMR217, route du Panorama BP6, 92265 Fontenay-aux-Roses Cedex and CNRS FRE2937, Institut André Lwoff, 7, rue Guy Moquet, BP8, 94801 Villejuif Cedex, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Meiller
authors.forename: Sandra
authors.initials: S
authors.lastname: Alvarez
authors.forename: Pascal
authors.initials: P
authors.lastname: Drané
authors.forename: Christophe
authors.initials: C
authors.lastname: Lallemand
authors.forename: Brigitte
authors.initials: B
authors.lastname: Blanchard
authors.forename: Micheal
authors.initials: M
authors.lastname: Tovey
authors.forename: Evelyne
authors.initials: E
authors.lastname: May
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004307:Dose-Response Relationship, Radiation; D005720:Gamma Rays; D015971:Gene Expression Regulation, Enzymologic / Q000528:radiation effects; D051547:Heme Oxygenase-1 / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D051381:Rats; D012689:Sequence Homology, Nucleic Acid; D013154:Spleen / Q000378:metabolism / Q000528:radiation effects*; D013950:Thymus Gland / Q000378:metabolism / Q000528:radiation effects*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D016159:Tumor Suppressor Protein p53; D051547:Heme Oxygenase-1