Yin Yang 1 regulates the transcriptional activity of androgen receptor.

Yin Yang 1 regulates the transcriptional activity of androgen receptor.
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DOI:
10.1038/onc.2009.231
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发表时间:
2009-10-22
期刊:
影响因子:
8
通讯作者:
Sui, G.
Sui, G.
中科院分区:
医学1区
文献类型:
--
作者:
Deng, Z.;Wan, M.;Cao, P.;Rao, A.;Cramer, S. D.;Sui, G.

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多功能蛋白阴阳1(YY1)在基因表达的表观遗传调控中起着重要作用。YY1在各种类型的癌症中高度表达,包括前列腺癌。目前,YY1在前列腺癌发生中的作用机制尚不清楚。在本报告中,我们研究了YY1与雄激素受体(AR)之间的功能相互作用,以及YY1对AR介导的转录的影响。我们发现YY1在无细胞系统和培养细胞中都与AR发生物理相互作用。YY1是AR在促进前列腺特异性抗原(PSA)启动子转录方面的最佳转录活性所必需的。然而,YY1在LNCaP细胞中的异位表达并没有进一步增强PSA启动子驱动的报告基因,这表明在前列腺癌细胞中已经建立了YY1的最佳水平。一直以来,LNCaP细胞中YY1的缺失降低了内源性PSA水平,但过度表达YY1并没有显著增加PSA的表达。我们还观察到YY1-AR相互作用对于YY1介导的AR转录活性是必不可少的,YY1是与雄激素反应元件(ARE)结合的复合体中的一个必要成分。因此,我们的研究表明YY1与AR相互作用并调节其转录活性。
The multifunctional protein Yin Yang 1 (YY1) plays an important role in epigenetic regulation of gene expression. YY1 is highly expressed in various types of cancers, including prostate cancer. Currently, the mechanism underlying the functional role of YY1 in prostate tumorigenesis remains unclear. In this report, we investigated the functional interplay between YY1 and androgen receptor (AR), and the effect of YY1 on AR-mediated transcription. We found that YY1 physically interacts with AR both in a cell-free system and in cultured cells. YY1 is required for the optimal transcriptional activity of AR in promoting the transcription of the prostate specific antigen (PSA) promoter. However, ectopic YY1 expression in LNCaP cells did not further enhance the reporter driven by the PSA promoter, suggesting an optimal level of YY1 is already established in prostate tumor cells. Consistently, YY1 depletion in LNCaP cells reduced endogenous PSA levels, but overexpressed YY1 did not significantly increase PSA expression. We also observed that YY1-AR interaction is essential to YY1-mediated transcription activity of AR and YY1 is a necessary component in the complex binding to the androgen response element (ARE). Thus, our study demonstrates that YY1 interacts with AR and regulates its transcriptional activity.
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