title: Redox regulation of forkhead proteins through a p66shc-dependent signaling pathway.
abstract: Genetic determinants of longevity include the forkhead-related transcription factor DAF-16 in the worm Caenorhabditis elegans and the p66shc locus in mice. We demonstrate that p66shc regulates intracellular oxidant levels in mammalian cells and that hydrogen peroxide can negatively regulate forkhead activity. In p66shc-/- cells, the activity of the mammalian forkhead homolog FKHRL1 is increased and redox-dependent forkhead inactivation is reduced. In addition, expression of FKHRL1 results in an increase in both hydrogen peroxide scavenging and oxidative stress resistance. These results demonstrate an important functional relation between three distinct elements linked to aging: forkhead proteins, p66shc, and intracellular oxidants.
authors.affiliation: Cardiovascular Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Building 10/6N-240, 10 Center Drive, Bethesda, MD 20892-1622, USA.
authors.forename: Shino
authors.initials: S
authors.lastname: Nemoto
authors.forename: Toren
authors.initials: T
authors.lastname: Finkel
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D001393:Azoles / Q000494:pharmacology; D001769:Blood; D002478:Cells, Cultured; D003470:Culture Media; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D000071161:Forkhead Box Protein O1; D000071316:Forkhead Box Protein O3; D051858:Forkhead Transcription Factors; D016166:Free Radical Scavengers / Q000494:pharmacology; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism / Q000494:pharmacology; D054833:Isoindoles; D051379:Mice; D009154:Mutation; D009419:Nerve Tissue Proteins; D016566:Organoselenium Compounds / Q000494:pharmacology; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D016716:PC12 Cells; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D055765:Shc Signaling Adaptor Proteins; D015398:Signal Transduction; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014162:Transfection
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D001393:Azoles; D003470:Culture Media; D004268:DNA-Binding Proteins; C085126:FOXO1 protein, human; C499517:FOXO3 protein, human; C499515:FOXO3 protein, rat; D000071161:Forkhead Box Protein O1; D000071316:Forkhead Box Protein O3; D051858:Forkhead Transcription Factors; C474033:FoxO3 protein, mouse; D016166:Free Radical Scavengers; D054833:Isoindoles; D009419:Nerve Tissue Proteins; D016566:Organoselenium Compounds; D011506:Proteins; D011518:Proto-Oncogene Proteins; D017382:Reactive Oxygen Species; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; C528035:Shc1 protein, rat; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D014157:Transcription Factors; C074639:Foxo1 protein, rat; C042986:ebselen; D006861:Hydrogen Peroxide; D017346:Protein Serine-Threonine Kinases; D051057:Proto-Oncogene Proteins c-akt; D000111:Acetylcysteine