Mechanism of androgen receptor corepression by CKβBP2/CRIF1, a multifunctional transcription factor coregulator expressed in prostate cancer.

Mechanism of androgen receptor corepression by CKβBP2/CRIF1, a multifunctional transcription factor coregulator expressed in prostate cancer.
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CKβBP2/CRIF1 的雄激素受体辅抑制机制,一种在前列腺癌中表达的多功能转录因子辅调节因子。

DOI:
10.1016/j.mce.2013.09.036
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发表时间:
2014
影响因子:
4.1
通讯作者:
French,FrankS
French,FrankS
中科院分区:
医学2区
文献类型:
--
作者:
Tan,Jiann-An;Bai,Suxia;Grossman,Gail;Titus,MarkA;HarrisFord,O;Pop,ElenaA;Smith,GaryJ;Mohler,JamesL;Wilson,ElizabethM;French,FrankS

文献摘要

相似文献

转录因子共调节因子酪蛋白激酶 IIβ 结合蛋白 2 或 CR6 相互作用因子 1 (CKβBP2/CRIF1) 与前列腺癌细胞中的雄激素受体 (AR) 结合,并响应二氢睾酮与前列腺特异性抗原基因增强子上的 AR 一起定位,但不结合 DNA,表明染色质中的 CKβBP2/CRIF1 定位是由 AR 决定的。在本研究中,我们还表明 CKβBP2/CRIF1 抑制野生型 AR 和 AR N 端转录活性,与 AR C 端区域结合,抑制 AR N 和 C 端结构域的相互作用(N/C 相互作用),并与 p160 共激活剂竞争与 AR C 端结构域的结合,表明 CKβBP2/CRIF1 干扰 AR 激活功能 1 和 2。 CKβBP2/CRIF1 主要在良性前列腺增生的基质细胞以及前列腺癌的基质和上皮细胞。与良性前列腺增生相比,雄激素依赖性前列腺癌上皮中的CKβBP2/CRIF1蛋白增加,与雄激素依赖性前列腺癌相比,去势复发上皮中CKβBP2/CRIF1蛋白略有减少。多功能 CKβBP2/CRIF1 是一种 STAT3 相互作用蛋白,据报道是 STAT3 的共激活因子。 CKβBP2/CRIF1 在前列腺癌中与 STAT3 一起表达,其中 STAT3 可能有助于抵消 CKβBP2/CRIF1 的 AR 抑制作用,并允许 AR 调节前列腺癌的生长。
The transcription factor coregulator Casein kinase IIβ-binding protein 2 or CR6-interacting factor 1 (CKβBP2/CRIF1) binds the androgen receptor (AR) in prostate cancer cells and in response to dihydrotestosterone localizes with AR on the prostate-specific antigen gene enhancer, but does not bind DNA suggesting CKβBP2/CRIF1 localization in chromatin is determined by AR. In this study we show also that CKβBP2/CRIF1 inhibits wild-type AR and AR N-terminal transcriptional activity, binds to the AR C-terminal region, inhibits interaction of the AR N- and C-terminal domains (N/C interaction) and competes with p160 coactivator binding to the AR C-terminal domain, suggesting CKβBP2/CRIF1 interferes with AR activation functions 1 and 2. CKβBP2/CRIF1 is expressed mainly in stromal cells of benign prostatic hyperplasia and in stroma and epithelium of prostate cancer. CKβBP2/CRIF1 protein is increased in epithelium of androgen-dependent prostate cancer compared to benign prostatic hyperplasia and decreased slightly in castration recurrent epithelium compared to androgen-dependent prostate cancer. The multifunctional CKβBP2/CRIF1 is a STAT3 interacting protein and reported to be a coactivator of STAT3. CKβBP2/CRIF1 is expressed with STAT3 in prostate cancer where STAT3 may help to offset the AR repressor effect of CKβBP2/CRIF1 and allow AR regulation of prostate cancer growth.