Tumour suppressor TRIM33 targets nuclear β-catenin degradation.

Tumour suppressor TRIM33 targets nuclear β-catenin degradation.
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DOI:
10.1038/ncomms7156
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发表时间:
2015-02-02
影响因子:
16.6
通讯作者:
Huang, Suyun
Huang, Suyun
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Xue, Jianfei;Chen, Yaohui;Wu, Yamei;Wang, Zhongyong;Zhou, Aidong;Zhang, Sicong;Lin, Kangyu;Aldape, Kenneth;Majumder, Sadhan;Lu, Zhimin;Huang, Suyun

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细胞核中β-连环蛋白的异常激活与多种人类癌症有关,但细胞核β-连环蛋白的命运尚不清楚。在这里,我们证明了三重基序包含蛋白33(TRIM 33),作为一个E3泛素连接酶,减少核β-连环蛋白的丰度。TRIM 33介导的β-连环蛋白是不稳定的,并且是GSK-3β或β-TrCP非依赖性的。TRIM 33与核β-连环蛋白相互作用并使其泛素化。此外,TRIM 33-β-连环蛋白相互作用需要蛋白激酶Cδ,其直接磷酸化Ser 715处的β-连环蛋白。TRIM 33在抑制肿瘤细胞增殖和脑肿瘤发展中的功能取决于TRIM 33促进的β-连环蛋白降解。在人胶质母细胞瘤样本中,内源性TRIM 33水平与β-连环蛋白负相关。总之,我们的发现将TRIM 33鉴定为肿瘤抑制因子,其可以通过降解核β-连环蛋白来消除肿瘤细胞增殖和肿瘤发生。这项工作提出了一种新的治疗策略,对人类癌症引起的异常激活的β-连环蛋白。
Aberrant activation of β-catenin in the nucleus has been implicated in a variety of human cancers but the fate of nuclear β-catenin is unknown. Here we demonstrate that tripartite motif-containing protein 33 (TRIM33), acting as an E3 ubiquitin ligase, reduces the abundance of nuclear β-catenin protein. TRIM33-mediated β-catenin is destabilized and is GSK-3β or β-TrCP independent. TRIM33 interacts with and ubiquitylates nuclear β-catenin. Moreover, protein kinase Cδ, which directly phosphorylates β-catenin at Ser715, is required for the TRIM33–β-catenin interaction. The function of TRIM33 in suppressing tumour cell proliferation and brain tumour development depends on TRIM33-promoted β-catenin degradation. In human glioblastoma specimens, endogenous TRIM33 levels are inversely correlated with β-catenin. In summary, our findings identify TRIM33 as a tumour suppressor that can abolish tumour cell proliferation and tumorigenesis by degrading nuclear β-catenin. This work suggests a new therapeutic strategy against human cancers caused by aberrant activation of β-catenin.
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