title: Nitric oxide-induced cellular stress and p53 activation in chronic inflammation.
abstract: Free radical-induced cellular stress contributes to cancer during chronic inflammation. Here, we investigated mechanisms of p53 activation by the free radical, NO. NO from donor drugs induced both ataxia-telangiectasia mutated (ATM)- and ataxia-telangiectasia mutated and Rad3-related-dependent p53 posttranslational modifications, leading to an increase in p53 transcriptional targets and a G(2)M cell cycle checkpoint. Such modifications were also identified in cells cocultured with NO-releasing macrophages. In noncancerous colon tissues from patients with ulcerative colitis (a cancer-prone chronic inflammatory disease), inducible NO synthase protein levels were positively correlated with p53 serine 15 phosphorylation levels. Immunostaining of HDM-2 and p21(WAF1) was consistent with transcriptionally active p53. Our study highlights a pivotal role of NO in the induction of cellular stress and the activation of a p53 response pathway during chronic inflammation.
authors.affiliation: Laboratories of Human Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: Lorne J
authors.initials: LJ
authors.lastname: Hofseth
authors.forename: Shin'ichi
authors.initials: S
authors.lastname: Saito
authors.forename: S Perwez
authors.initials: SP
authors.lastname: Hussain
authors.forename: Michael G
authors.initials: MG
authors.lastname: Espey
authors.forename: Katrina M
authors.initials: KM
authors.lastname: Miranda
authors.forename: Yuzuru
authors.initials: Y
authors.lastname: Araki
authors.forename: Chamelli
authors.initials: C
authors.lastname: Jhappan
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Higashimoto
authors.forename: Peijun
authors.initials: P
authors.lastname: He
authors.forename: Steven P
authors.initials: SP
authors.lastname: Linke
authors.forename: Martha M
authors.initials: MM
authors.lastname: Quezado
authors.forename: Irit
authors.initials: I
authors.lastname: Zurer
authors.forename: Varda
authors.initials: V
authors.lastname: Rotter
authors.forename: David A
authors.initials: DA
authors.lastname: Wink
authors.forename: Ettore
authors.initials: E
authors.lastname: Appella
authors.forename: Curtis C
authors.initials: CC
authors.lastname: Harris
mesh_terms: D000818:Animals; D001260:Ataxia Telangiectasia / Q000235:genetics; D064007:Ataxia Telangiectasia Mutated Proteins; D001943:Breast Neoplasms; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D002460:Cell Line; D018920:Coculture Techniques; D003093:Colitis, Ulcerative / Q000473:pathology / Q000503:physiopathology*; D020552:Comet Assay; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000378:metabolism; D004249:DNA Damage; D004268:DNA-Binding Proteins; D005260:Female; D005609:Free Radicals / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000503:physiopathology*; D007371:Interferon-gamma / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000187:drug effects / Q000502:physiology; D051379:Mice; D009569:Nitric Oxide / Q000502:physiology*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II; D010766:Phosphorylation; D010768:Phosphoserine / Q000378:metabolism; D011499:Protein Processing, Post-Translational; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*; D025521:Tumor Suppressor Proteins
chemical_list: C493956:CDKN1A protein, human; C493957:Cdkn1a protein, mouse; D018797:Cell Cycle Proteins; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004268:DNA-Binding Proteins; D005609:Free Radicals; D008070:Lipopolysaccharides; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D010768:Phosphoserine; D009569:Nitric Oxide; D007371:Interferon-gamma; C496319:NOS2 protein, human; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse; C576324:ATM protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases