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Functional Interaction Between ß-Catenin and FOXO in Oxidative Stress Signaling
Marieke A. G. Essers,1Lydia M. M. de Vries-Smits,1Nick Barker,2Paulien E. Polderman,1Boudewijn M. T. Burgering,1*Hendrik C. Korswagen2*
ß-Catenin is a multifunctional protein that mediatesWnt signaling by binding to members of the T cell factor (TCF)family of transcription factors. Here, we report an evolutionarilyconserved interaction of ß-catenin with FOXO transcriptionfactors, which are regulated by insulin and oxidative stresssignaling. ß-Catenin binds directly to FOXO and enhancesFOXO transcriptional activity in mammalian cells. In Caenorhabditiselegans, loss of the ß-catenin BAR-1 reduces the activityof the FOXO ortholog DAF-16 in dauer formation and life span.Association of ß-catenin with FOXO was enhanced incells exposed to oxidative stress. Furthermore, BAR-1 was requiredfor the oxidative stressinduced expression of the DAF-16target gene sod-3 and for resistance to oxidative damage. Theseresults demonstrate a role for ß-catenin in regulatingFOXO function that is particularly important under conditionsof oxidative stress.
1 Department of Physiological Chemistry and Center for Biomedical Genetics, University Medical Center, Universiteitsweg 100, 3584 CG Utrecht, Netherlands. 2 Hubrecht Laboratory and Center for Biomedical Genetics, Uppsalalaan 8, 3584 CT Utrecht, Netherlands.
* To whom correspondence should be addressed. E-mail: b.m.t.burgering{at}med.uu.nl and rkors{at}niob.knaw.nl
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