Coactivators enable glucocorticoid receptor recruitment to fine-tune estrogen receptor transcriptional responses.

Coactivators enable glucocorticoid receptor recruitment to fine-tune estrogen receptor transcriptional responses.
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DOI:
10.1093/nar/gkt100
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发表时间:
2013-04
影响因子:
14.9
通讯作者:
Mancini MA
Mancini MA
中科院分区:
生物学2区
文献类型:
--
作者:
Bolt MJ;Stossi F;Newberg JY;Orjalo A;Johansson HE;Mancini MA

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核受体(NR)是病理生理过程的中央调节器;然而,它们的反应如何干扰仍然没有完全理解。本研究的目的是确定在共激动剂治疗下类固醇NR是否以及如何影响彼此的活性。我们使用了一种独特的系统,该系统由雌激素受体反应单元的多拷贝整合组成,该系统允许直接可视化和定量雌激素受体α(ERα)DNA结合、共调节因子募集和转录读出。我们发现ERα DNA负载是双重激动剂治疗后其他I型核受体共同募集所必需的。我们关注ERα/糖皮质激素受体的相互作用,并证明它需要类固醇受体辅激活剂(SRC-2,SRC-3)和介质组分MED 14。然后,我们验证了乳腺癌细胞中内源性靶基因的这种合作相互作用。总之,这项工作突出了另一层机制的复杂性,通过该机制,NR在多种激素刺激下在染色质上相互串扰。
Nuclear receptors (NRs) are central regulators of pathophysiological processes; however, how their responses intertwine is still not fully understood. The aim of this study was to determine whether and how steroid NRs can influence each other’s activity under co-agonist treatment. We used a unique system consisting of a multicopy integration of an estrogen receptor responsive unit that allows direct visualization and quantification of estrogen receptor alpha (ERα) DNA binding, co-regulator recruitment and transcriptional readout. We find that ERα DNA loading is required for other type I nuclear receptors to be co-recruited after dual agonist treatment. We focused on ERα/glucocorticoid receptor interplay and demonstrated that it requires steroid receptor coactivators (SRC-2, SRC-3) and the mediator component MED14. We then validated this cooperative interplay on endogenous target genes in breast cancer cells. Taken together, this work highlights another layer of mechanistic complexity through which NRs cross-talk with each other on chromatin under multiple hormonal stimuli.
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