Nkx1-2 is a transcriptional repressor and is essential for the activation of Brachyury in P19 mouse embryonal carcinoma cell.
Nkx1-2 is a transcriptional repressor and is essential for the activation of Brachyury in P19 mouse embryonal carcinoma cell.
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DOI：
10.1016/j.diff.2012.02.010
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发表时间：
2012-06
期刊：
影响因子：
2.9
通讯作者：
Marikawa, Yusuke
中科院分区：
文献类型：
--
作者：
Tamashiro, Dana Ann A.;Alarcon, Vernadeth B.;Marikawa, Yusuke
关键词：
Activation of Wnt/β-catenin signaling is crucial for the differentiation of pluripotent stem cells, namely the epiblast, embryonic stem, and embryonal carcinoma cells, into mesendoderm. However, downstream events of Wnt/β-catenin signaling that control the formation of mesendoderm are still unclear. In the present study, we used mouse P19 embryonal carcinoma cells as a model, and identified a homeodomain protein Nkx1-2 as a key regulator of mesendoderm formation. In the mouse embryo, Nkx1-2 was expressed in the primitive streak, in which the nascent mesendoderm emerges. In P19 cells, the expression of Nkx1-2 was activated by Wnt/β-catenin signaling independently of Brachyury, an evolutionary conserved early mesendoderm gene. In contrast, the expression of Nkx1-2 was both necessary and sufficient for the activation of Brachyury. Nkx1-2 acted as a transcriptional repressor to mediate the action of Wnt/β-catenin signaling to activate the Brachyury expression. We found Tcf3 as a potential target of gene repression by Nkx1-2, and the down-regulation of Tcf3 was partly required for effective activation of Brachyury by Wnt/β-catenin signaling. These results suggest that Nkx1-2 is a critical component of the gene regulatory network that operates downstream of Wnt/β-catenin signaling to regulate the formation of mesendoderm.
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