Glucocorticoid receptor (GR) beta has intrinsic, GRalpha-independent transcriptional activity.

Glucocorticoid receptor (GR) beta has intrinsic, GRalpha-independent transcriptional activity.
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DOI:
10.1016/j.bbrc.2009.02.110
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发表时间:
2009-04-17
影响因子:
3.1
通讯作者:
Chrousos, George P.
Chrousos, George P.
中科院分区:
生物学4区
文献类型:
--
作者:
Kino, Tomoshige;Manoli, Irini;Kelkar, Sujata;Wang, Yonghong;Su, Yan A.;Chrousos, George P.

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人糖皮质激素受体(GR)基因通过交替使用特异性外显子9β和α分别产生C末端GRβ和GRα亚型。我们通过构建稳定表达EGFP-GRβ或EGFP的HeLa细胞来研究GRβ对内源基因的转录活性。基因芯片分析显示GRβ具有内在的基因特异性转录活性,可负性或正性调控大量基因的mRNA表达。大多数GRβ应答基因与GRα调节的基因不同,而GRβ和GRα在一个基因亚群中相互调节对方的转录活性。我们在HCT 116细胞中未观察到GRβ的核转位和RU 486对该受体的激活,RU 486是一种先前报道的结合GRβ并诱导核转位的合成类固醇。我们的研究结果表明,GRβ具有内在的,GRα独立的,基因特异性的转录活性,除了其先前报道的显性负效应GRα诱导的反式激活的GR驱动的启动子。
The human glucocorticoid receptor (GR) gene produces C-terminal GRβ and GRα isoforms through alternative use of specific exons 9β and α, respectively. We explored the transcriptional activity of GRβ on endogenous genes by developing HeLa cells stably expressing EGFP-GRβ or EGFP. Microarray analyses revealed that GRβ had intrinsic gene-specific transcriptional activity, regulating mRNA expression of a large number of genes negatively or positively. Majority of GRβ-responsive genes was distinct from those modulated by GRα, while GRβ and GRα mutually modulated each other’s transcriptional activity in a subpopulation of genes. We did not observe in HCT116 cells nuclear translocation of GRβ and activation of this receptor by RU 486, a synthetic steroid previously reported to bind GRβ and to induce nuclear translocation. Our results indicate that GRβ has intrinsic, GRα-independent, gene-specific transcriptional activity, in addition to its previously reported dominant negative effect on GRα-induced transactivation of GRE-driven promoters.
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