Destruction of full-length androgen receptor by wild-type SPOP, but not prostate-cancer-associated mutants.

Destruction of full-length androgen receptor by wild-type SPOP, but not prostate-cancer-associated mutants.
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野生型 SPOP 破坏全长雄激素受体,但前列腺癌相关突变体则不然。

DOI:
10.1016/j.celrep.2014.01.013
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发表时间:
2014-02-27
期刊:
影响因子:
8.8
通讯作者:
Huang H
Huang H
中科院分区:
生物学1区
文献类型:
--
作者:
An J;Wang C;Deng Y;Yu L;Huang H

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SPOP E3泛素连接酶基因在人前列腺癌中经常发生突变。在这里,我们证明,SPOP识别雄激素受体(AR)的铰链结构域中的丝氨酸/苏氨酸丰富的降解决定子,并诱导全长AR的降解和抑制AR介导的基因转录和前列腺癌细胞生长。AR剪接变体,其中大多数缺乏铰链结构域,逃避SPOP介导的降解。前列腺癌相关的SPOP突变体不能结合并促进AR破坏。此外,雄激素拮抗SPOP介导的AR降解,而抗雄激素促进这一过程。本研究确定AR为SPOP的真正底物,并阐明了SPOP突变在前列腺癌中的作用,从而暗示了该途径在前列腺癌抗雄激素治疗抵抗中的重要性。
The SPOP E3 ubiquitin ligase gene is frequently mutated in human prostate cancers. Here, we demonstrate that SPOP recognizes a Ser/Thr-rich degron in the hinge domain of androgen receptor (AR)and induces degradation of full-length AR and inhibition of AR-mediated gene transcription and prostate cancer cell growth. AR splicing variants, most of which lack the hinge domain, escape SPOP-mediated degradation. Prostate-cancer-associated mutants of SPOP cannot bind to and promote AR destruction. Furthermore, androgens antagonize SPOP-mediated degradation of AR, whereas antiandrogens promote this process. This study identifies AR as a bona fide substrate of SPOP and elucidates a role of SPOP mutations in prostate cancer, thus implying the importance of this pathway in resistance to antiandrogen therapy of prostate cancer.
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