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首页> 外文期刊>Journal of Cellular Physiology >Epigenetic Signatures at the RUNX2-P1 and Sp7 Gene Promoters Control Osteogenic Lineage Commitment of Umbilical Cord-Derived Mesenchymal Stem Cells
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Epigenetic Signatures at the RUNX2-P1 and Sp7 Gene Promoters Control Osteogenic Lineage Commitment of Umbilical Cord-Derived Mesenchymal Stem Cells

机译:在RUNX2-P1和Sp7基因表观遗传特征启动子控制成骨的血统的承诺脐Cord-Derived的间充质干细胞

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Wharton's Jelly mesenchymal stem cells (WJ-MSCs) are an attractive potential source of multipotent stem cells for bone tissue replacement therapies. However, the molecular mechanisms involved in their osteogenic conversion are poorly understood. Particularly, epigenetic control operating at the promoter regions of the two master regulators of the osteogenic program, RUNX2/P57 and SP7 has not yet been described in WJ-MSCs. Via quantitative PCR profiling and chromatin immunoprecipitation (ChIP) studies, here we analyze the ability of WJ-MSCs to engage osteoblast lineage. In undifferentiated WJ-MSCs, RUNX2/P57 P1, and SP7 promoters are found deprived of significant levels of the histone post-translational marks that are normally associated with transcriptionally active genes (H3ac, H3K27ac, and H3K4me3). Moreover, the RUNX2 P1 promoter lacks two relevant histone repressive marks (H3K9me3 and H3K27me3). Importantly, RUNX2 P1 promoter is found highly enriched in the H3K4me1 mark, which has been shown recently to mediate gene repression of key regulatory genes. Upon induction of WJ-MSCs osteogenic differentiation, we found that RUNX2/P57, but not SP7 gene expression is strongly activated, in a process that is accompanied by enrichment of activating histone marks (H3K4me3, H3ac, and H3K27ac) at the P1 promoter region. Histone mark analysis showed that SP7 gene promoter is robustly enriched in epigenetic repressive marks that may explain its poor transcriptional response to osteoblast differentiating media. Together, these results point to critical regulatory steps during epigenetic control of WJ-MSCs osteogenic lineage commitment that are relevant for future applications in regenerative medicine. (C) 2016 Wiley Periodicals, Inc.
机译:沃顿商学院的果冻间充质干细胞(WJ-MSCs)是多功能的一个有吸引力的潜在来源干细胞在骨组织替代疗法。然而,所涉及的分子机制他们的成骨的转换是不佳理解。启动子区域的两个操作主监管机构的成骨的计划,RUNX2 / P57 SP7尚未被描述WJ-MSCs。染色质免疫沉淀反应(芯片)的研究中,在这里,我们分析WJ-MSCs参与的能力成骨细胞谱系。RUNX2 / P57 P1和SP7推动者被剥夺了重要的组蛋白的水平翻译后是正常的与基因转录活性有关(H3ac H3K27ac,和H3K4me3)。P1发起人缺少两个相关的组蛋白专制标志(H3K9me3和H3K27me3)。P1启动子中发现高纯度H3K4me1马克,最近已被证明调解基因关键调控基因的镇压。WJ-MSCs成骨诱导分化,我们发现RUNX2 / P57,但不是SP7基因表达强烈激活,在伴随着丰富的过程激活组蛋白标记(H3K4me3 H3ac,H3K27ac) P1启动子区域。分析表明,SP7基因启动子强劲丰富在表观遗传压抑的标志这可以解释它可怜的转录对成骨细胞分化的媒体。在一起,这些结果指向至关重要在表观遗传控制的监管措施WJ-MSCs成骨的血统的承诺为未来的应用再生有关医学。

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