The Glucocorticoid Receptor Regulates the ANGPTL4 Gene in a CTCF-Mediated Chromatin Context in Human Hepatic Cells.

The Glucocorticoid Receptor Regulates the ANGPTL4 Gene in a CTCF-Mediated Chromatin Context in Human Hepatic Cells.
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DOI:
10.1371/journal.pone.0169225
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Nakao M
Nakao M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Nakamoto M;Ishihara K;Watanabe T;Hirosue A;Hino S;Shinohara M;Nakayama H;Nakao M

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糖皮质激素通过糖皮质激素受体(GR)的信号转导在应激反应和能量代谢中起着重要作用。这种激素作用以细胞类型特异性和条件依赖性的方式整合到GR靶基因的转录控制中。在本研究中,我们发现GR调节血管生成素样4基因(ANGPTL4)在CCCTC结合因子(CTCF)介导的染色质背景下,在人肝HepG2细胞。在ANGPTL4基因座内存在至少四个CTCF富集位点和两个GR结合位点。其中,主要的CTCF富集位点位于结合GR的ANGPTL4增强子附近。我们表明,CTCF是诱导和随后沉默ANGPTL4表达所必需的,以响应地塞米松(Dex),并且在用Dex长期治疗后转录减少。虽然ANGPTL4基因座在Dex存在和不存在下保持稳定的高阶染色质构象,但Dex结合的GR通过ANGPTL4增强子、启动子和CTCF位点之间的相互作用激活ANGPTL4的转录,但不激活相邻三个基因的转录。这些结果表明,配体GR时空控制ANGPTL4的转录在染色体的情况下。
Glucocorticoid signaling through the glucocorticoid receptor (GR) plays essential roles in the response to stress and in energy metabolism. This hormonal action is integrated to the transcriptional control of GR-target genes in a cell type-specific and condition-dependent manner. In the present study, we found that the GR regulates the angiopoietin-like 4 gene (ANGPTL4) in a CCCTC-binding factor (CTCF)-mediated chromatin context in the human hepatic HepG2 cells. There are at least four CTCF-enriched sites and two GR-binding sites within the ANGPTL4 locus. Among them, the major CTCF-enriched site is positioned near the ANGPTL4 enhancer that binds GR. We showed that CTCF is required for induction and subsequent silencing of ANGPTL4 expression in response to dexamethasone (Dex) and that transcription is diminished after long-term treatment with Dex. Although the ANGPTL4 locus maintains a stable higher-order chromatin conformation in the presence and absence of Dex, the Dex-bound GR activated transcription of ANGPTL4 but not that of the neighboring three genes through interactions among the ANGPTL4 enhancer, promoter, and CTCF sites. These results reveal that liganded GR spatiotemporally controls ANGPTL4 transcription in a chromosomal context.
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