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Learn MoreDuring mesenchymal stem cell (MSC) differentiation, both Wnt signaling and the development of a rigid cytoskeleton promote commitment to the osteoblastic over adipogenic lineage. -catenin is thought to play a critical role in Wnt effects. We show that -catenin was additive with cytoskeletal signals to prevent adipogenesis, and -catenin knockdown promoted adipogenesis even when the actin cytoskeleton was depolymerized. -catenin also prevented osteoblast commitment in a cytoskeletal-independent manner, with -catenin knockdown enhancing lineage commitment. Chip-seq showed that -catenin associated with the promoter of EZH2, a key component of the PRC2 complex that governs genome methylation. Knocking down -catenin lowered EZH2 levels and H3K27me3 at osteogenic loci. Further, when EZH2 was inhibited, -catenin s anti-differentiation effects were lost. These results indicate that regulating EZH2 activity is key to -catenin effects on MSC to preserve MSC multipotentiality. SOURCE: Andre,J,van Wijnen (vanwijnen.andre@mayo.edu) - Mayo Clinic
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