The Subnuclear Three-dimensional Image Analysis of Androgen Receptor Fused to Green Fluorescence Protein*

The Subnuclear Three-dimensional Image Analysis of Androgen Receptor Fused to Green Fluorescence Protein*
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与绿色荧光蛋白融合的雄激素受体的亚核三维图像分析*

DOI:
10.1074/jbc.m101755200
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发表时间:
2001
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
H. Nawata
H. Nawata
中科院分区:
--
文献类型:
--
作者:
A. Tomura;K. Goto;H. Morinaga;M. Nomura;T. Okabe;T. Yanase;R. Takayanagi;H. Nawata

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为了建立新的方法,以区分转录活性的雄激素受体(AR)从转录非活性的AR,我们进行了三维共聚焦显微镜图像的核内AR的建设。该方法清楚地区分了转录活性AR标记的绿色荧光蛋白(AR-GFP)的亚核定位从转录非活性AR-GFP。具有转录活性的AR-GFP主要在常染色质和异染色质之间的边界区域产生250-400个荧光灶。虽然AR-GFP结合到这样的抗雄激素,如羟基芴醇或比卡鲁胺易位到细胞核,他们均匀地散布在整个细胞核,不产生任何荧光灶。抗雄激素的环境干扰化学品,如1,1-二氯-2,2-双(对氯苯基)乙烯,乙烯唑啉,或除草醚,也破坏了核内荧光灶。点突变(T877 A)导致AR-GFP中配体特异性的丧失。即使在这种突变体受体中,激动剂,如双氢睾酮,羟氟沙星,或孕酮,在细胞核中产生的荧光灶,而转录失活的突变体结合比卡鲁胺被观察到均匀分布在细胞核中。两者合计,我们的研究结果表明,核转位后,AR可能位于在核中的特定区域,同时展示集群紧密依赖于激动剂诱导的反式激活能力。
To establish the novel approach in order to distinguish the transcriptionally active androgen receptor (AR) from the transcriptionally inactive AR, we performed the three-dimensional construction of confocal microscopic images of intranuclear AR. This method clearly distinguished the subnuclear localization of transcriptionally active AR tagged with green fluorescent protein (AR-GFP) from the transcriptionally inactive AR-GFP. Transcriptionally active AR-GFP mainly produced 250–400 fluorescence foci in the boundary region between euchromatin and heterochromatin. Although the AR-GFP bound to such antiandrogens as hydroxyflutamide or bicalutamide translocated to the nucleus, they homogeneously spread throughout the nucleus without producing any fluorescence foci. Antiandrogenic environmental disrupting chemicals, such as 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene, vinclozolin, or nitrofen, also disrupted the intranuclear fluorescence foci. A point mutation (T877A) resulted in the loss of ligand specificity in AR-GFP. Even in this mutant receptor, agonists, such as dihydrotestosterone, hydroxyflutamide, or progesterone, produced the fluorescence foci in the nucleus, whereas the transcriptionally inactive mutant binding bicalutamide was observed to be spread homogeneously in the nucleus. Taken together, our findings suggest that, after nuclear translocation, AR is possibly located in the specific region in the nucleus while demonstrating clustering tightly depending on the agonist-induced transactivation competence.
DOI: --
发表时间: 1986
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影响因子: --
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