title: Functional interaction between beta-catenin and FOXO in oxidative stress signaling.
abstract: beta-Catenin is a multifunctional protein that mediates Wnt signaling by binding to members of the T cell factor (TCF) family of transcription factors. Here, we report an evolutionarily conserved interaction of beta-catenin with FOXO transcription factors, which are regulated by insulin and oxidative stress signaling. beta-Catenin binds directly to FOXO and enhances FOXO transcriptional activity in mammalian cells. In Caenorhabditis elegans, loss of the beta-catenin BAR-1 reduces the activity of the FOXO ortholog DAF-16 in dauer formation and life span. Association of beta-catenin with FOXO was enhanced in cells exposed to oxidative stress. Furthermore, BAR-1 was required for the oxidative stress-induced expression of the DAF-16 target gene sod-3 and for resistance to oxidative damage. These results demonstrate a role for beta-catenin in regulating FOXO function that is particularly important under conditions of oxidative stress.
authors.affiliation: Department of Physiological Chemistry and Center for Biomedical Genetics, University Medical Center, Universiteitsweg 100, 3584 CG Utrecht, Netherlands.
authors.forename: Marieke A G
authors.initials: MA
authors.lastname: Essers
authors.forename: Lydia M M
authors.initials: LM
authors.lastname: de Vries-Smits
authors.forename: Nick
authors.initials: N
authors.lastname: Barker
authors.forename: Paulien E
authors.initials: PE
authors.lastname: Polderman
authors.forename: Boudewijn M T
authors.initials: BM
authors.lastname: Burgering
authors.forename: Hendrik C
authors.initials: HC
authors.lastname: Korswagen
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D017173:Caenorhabditis elegans / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D029742:Caenorhabditis elegans Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D002460:Cell Line; D045744:Cell Line, Tumor; D050760:Cyclin-Dependent Kinase Inhibitor p27; D003598:Cytoskeletal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism; D000071161:Forkhead Box Protein O1; D051858:Forkhead Transcription Factors; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D047468:Immunoprecipitation; D007328:Insulin / Q000494:pharmacology; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D018021:Lithium Chloride / Q000494:pharmacology; D008136:Longevity; D051379:Mice; D009154:Mutation; D018384:Oxidative Stress; D011972:Receptor, Insulin / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D013482:Superoxide Dismutase / Q000378:metabolism; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*; D014162:Transfection; D051176:beta Catenin
chemical_list: C436291:CDKN1B protein, human; C495270:CTNNB1 protein, human; C495267:CTNNB1 protein, mouse; D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins; C085126:FOXO1 protein, human; C108803:FOXO4 protein, human; D000071161:Forkhead Box Protein O1; D051858:Forkhead Transcription Factors; D007328:Insulin; D047908:Intracellular Signaling Peptides and Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C115014:bar-1 protein, C elegans; D051176:beta Catenin; C108831:daf-16 protein, C elegans; D050760:Cyclin-Dependent Kinase Inhibitor p27; D006861:Hydrogen Peroxide; D013482:Superoxide Dismutase; C107483:DAF-2 protein, C elegans; D011972:Receptor, Insulin; D018021:Lithium Chloride