The molecular basis of vitamin D receptor and beta-catenin crossregulation.
Fiche publication
Date publication
mars 2006
Auteurs
Membres identifiés du Cancéropôle Est :
Dr MORAS Dino
Tous les auteurs :
Shah S, Islam MN, Dakshanamurthy S, Rizvi I, Rao M, Herrell R, Zinser G, Valrance M, Aranda A, Moras D, Norman A, Welsh J, Byers SW
Lien Pubmed
Résumé
The signaling/oncogenic activity of beta-catenin can be repressed by activation of the vitamin D receptor (VDR). Conversely, high levels of beta-catenin can potentiate the transcriptional activity of 1,25-dihydroxyvitamin D3 (1,25D). We show here that the effects of beta-catenin on VDR activity are due to interaction between the activator function-2 (AF-2) domain of the VDR and C terminus of beta-catenin. Acetylation of the beta-catenin C terminus differentially regulates its ability to activate TCF or VDR-regulated promoters. Mutation of a specific residue in the AF-2 domain, which renders the VDR trancriptionally inactive in the context of classical coactivators, still allows interaction with beta-catenin and ligand-dependent activation of VDRE-containing promoters. VDR antagonists, which block the VDRE-directed activity of the VDR and recruitment of classical coactivators, do allow VDR to interact with beta-catenin, which suggests that these and perhaps other ligands would permit those functions of the VDR that involve beta-catenin interaction.
Référence
Mol Cell. 2006 Mar 17;21(6):799-809.