Differential suppression of the aryl hydrocarbon receptor nuclear translocator-dependent function by an aryl hydrocarbon receptor PAS-A-derived inhibitory molecule.

Differential suppression of the aryl hydrocarbon receptor nuclear translocator-dependent function by an aryl hydrocarbon receptor PAS-A-derived inhibitory molecule.
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芳烃受体 PAS-A 衍生的抑制分子对芳烃受体核转位子依赖性功能的差异抑制。

DOI:
10.1016/j.bcp.2014.01.021
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发表时间:
2014
影响因子:
5.8
通讯作者:
Chan,WilliamK
Chan,WilliamK
中科院分区:
医学2区
文献类型:
--
作者:
Xie,Jinghang;Huang,Xin;Park,MikiS;Pham,HangM;Chan,WilliamK

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芳烃受体 (AhR) 与芳烃受体核转位子 (Arnt) 异二聚化以进行转录调节。我们生成了三个大小为 12-24 kDa 的人类 AhR N 端删除结构,即 D1、D2 和 D3,以抑制 Arnt 功能。我们观察到所有三个缺失都以相似的亲和力与人类 Arnt 相互作用。 D2 含有部分 AhR PAS-A 结构域并与 Arnt 的 PAS-A 结构域相互作用,抑制 AhR 凝胶移位复合物的形成。 D2 抑制 Hep3B 细胞中 3-甲基胆蒽诱导、二恶英反应元件 (DRE) 驱动的荧光素酶活性,外源性 Arnt 可以逆转这种 D2 抑制。 D2 在 Hep3B 细胞中在信息和蛋白质水平上抑制 CYP1A1 的诱导;然而,CYP1B1 诱导不受影响。 D2 抑制 Arnt 向 cyp1a1 启动子的募集,但不抑制向 cyp1b1 启动子的募集,部分原因是 AhR/Arnt 异二聚体与 cyp1b1DRE 的结合比与 cyp1a1DRE 的结合更好。有趣的是,D2 对氯化钴诱导的、缺氧诱导因子 1 (HIF-1) 依赖性的 vegf、aldolasec 和 ldh 信息的表达没有影响。我们的数据表明,DRE 的侧翼序列有助于 AhR/Arnt 异二聚体与其内源增强子的结合亲和力,并且 AhR 和 HIF-1 的功能可以被 D2 抑制分子差异抑制。
The aryl hydrocarbon receptor (AhR) heterodimerizes with the aryl hydrocarbon receptor nuclear translocator (Arnt) for transcriptional regulation. We generated three N-terminal deletion constructs of the human AhR of 12–24 kDa in size – namely D1, D2, and D3 – to suppress the Arnt function. We observed that all three deletions interact with the human Arnt with similar affinities. D2, which contains part of the AhR PAS-A domain and interacts with the PAS-A domain of Arnt, inhibits the formation of the AhR gel shift complex. D2 suppresses the 3-methylcholanthrene-induced, dioxin response element (DRE)-driven luciferase activity in Hep3B cells and exogenous Arnt reverses this D2 suppression. D2 suppresses the induction of CYP1A1 at both the message and protein levels in Hep3B cells; however, the CYP1B1 induction is not affected. D2 suppresses the recruitment of Arnt to thecyp1a1promoter but not to thecyp1b1promoter, partly because the AhR/Arnt heterodimer binds better to thecyp1b1DRE than to thecyp1a1DRE. Interestingly, D2 has no effect on the cobalt chloride-induced, hypoxia inducible factor-1 (HIF-1)-dependent expression ofvegf,aldolasec, andldh-amessages. Our data reveal that the flanking sequences of the DRE contribute to the binding affinity of the AhR/Arnt heterodimer to its endogenous enhancers and the function of AhR and HIF-1 can be differentially suppressed by the D2 inhibitory molecule.
差异配体依赖性激活以及 Y322 在芳基烃受体介导的基因表达调节中的作用。
DOI: --
发表时间: 2011
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
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