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Wnt-promoted Isl1 expression through a novel TCF/LEF1 binding site and H3K9 acetylation in early stages of cardiomyocyte differentiation of P19CL6 cells

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Abstract

Islet 1 (ISL1), a marker of second heart field progenitors, plays a crucial role in cardiomyocyte differentiation and proliferation. However, little is known about transcriptional regulating mechanisms on Isl1 gene expression. Recent studies have demonstrated that Wnt/β-catenin signaling regulates Isl1 expression during heart development. However, the detailed mechanisms still remain unclear. In the present study performed during differentiation of P19CL6 into cardiomyocytes, we explored the underlying regulating mechanisms on Wnt/β-catenin-mediated Isl1 expression after we first confirmed that Wnt/β-catenin signaling promoted cardiomyocyte differentiation partly through Isl1 activation. We found a novel TCF/LEF1 binding site that was located 2300 bp upstream of the Isl1 ATG. Furthermore, Wnt/β-catenin signaling upregulated histone H3K9 acetylation on TCF/LEF1 binding sites on the Isl1 promoter, resulting in upregulation of Isl1 expression. This Wnt-mediated H3K9 acetylation on the Isl1 promoter was modulated by the acetyltransferase CREB-binding protein (CBP), instead of p300, through interaction with β-catenin. Collectively, these results suggest that in early stages of cardiomyocyte differentiation Wnt/β-catenin signaling promotes Isl1 expression via two ways: a novel TCF/LEF1 binding site and H3K9 acetylation conducted by CBP on the Isl1 promoter. To our knowledge, this is the first study reporting Wnt/β-catenin-regulated H3K9 acetylation on promoters of its target genes. And this study gives new insights into transcriptional regulating mechanisms of Wnt-mediated Isl1 expression during cardiomyocyte differentiation.

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Acknowledgments

We thank Prof. Yunzeng Zou, Fu Dan University, Shanghai, China for providing us the P19CL6 cell line. This work was supported by the National Natural Sciences Foundation of China (81370236, 30871253, 90919022, 81170713, 30400242), the Leading Academic Discipline Project of Beijing Education Bureau, and the 111 Project of Ministry of Education of China (B07001). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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The authors declare no conflicts of interest.

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  1. Yanming Li

    Present address: Department of Cardiology, Henan University Huaihe Hospital, Kaifeng, Henan, 475000, China

Authors and Affiliations

  1. Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education of China, Peking University, 38 Xueyuan Road, Beijing, 100191, China

    Huafei Lu, Yanming Li, Yang Wang, Yinan Liu, Weiping Wang, Zhuqing Jia, Ping Chen, Kangtao Ma & Chunyan Zhou

  2. Peking University Stem Cell Research Center and Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China

    Yinan Liu

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Lu, H., Li, Y., Wang, Y. et al. Wnt-promoted Isl1 expression through a novel TCF/LEF1 binding site and H3K9 acetylation in early stages of cardiomyocyte differentiation of P19CL6 cells. Mol Cell Biochem 391, 183–192 (2014). https://doi.org/10.1007/s11010-014-2001-y

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