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Inhibition of glycogen synthase kinase-3 alleviates Tcf3 repression of the pluripotency network and increases embryonic stem cell resistance to differentiation

MPG-Autoren
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Eckardt,  Dominik
Department of Molecular Embryology, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Kemler,  Rolf
Emeritus Group: Molecular Embryology, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Zitation

Wray, J., Kalkan, T., Gomez-Lopez, S., Eckardt, D., Cook, A., Kemler, R., et al. (2011). Inhibition of glycogen synthase kinase-3 alleviates Tcf3 repression of the pluripotency network and increases embryonic stem cell resistance to differentiation. Nature Cell Biology, 13, 838-845.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002B-8DD2-8
Zusammenfassung
Self-renewal of rodent embryonic stem cells is enhanced by partial inhibition of glycogen synthase kinase-3 (Gsk3; refs 1, 2). This effect has variously been attributed to stimulation of Wnt signalling by β-catenin, stabilization of Myc protein and global de-inhibition of anabolic processes. Here we demonstrate that β-catenin is not necessary for embryonic stem cell identity or expansion, but its absence eliminates the self-renewal response to Gsk3 inhibition. Responsiveness is fully restored by truncated β-catenin lacking the carboxy-terminal trans-activation domain. However, requirement for Gsk3 inhibition is dictated by expression of T-cell factor 3 (Tcf3) and mediated by direct interaction with β-catenin. Tcf3 local-izes to many pluripotency genes in embryonic stem cells. Our findings confirm that Tcf3 acts as a transcriptional repressor and reveal that β-catenin directly abrogates Tcf3 function. We conclude that Gsk3 inhibition stabilizes the embryonic stem cell state primarily by reducing repressive influence on the core pluripotency network.