BAP1 suppresses prostate cancer progression by deubiquitinating and stabilizing PTEN.

BAP1 suppresses prostate cancer progression by deubiquitinating and stabilizing PTEN.
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BAP1 通过去泛素化和稳定 PTEN 抑制前列腺癌进展

DOI:
10.1002/1878-0261.12844
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发表时间:
2021-01
期刊:
影响因子:
6.6
通讯作者:
Yu J
Yu J
中科院分区:
医学2区
文献类型:
--
作者:
Deng R;Guo Y;Li L;He J;Qiang Z;Zhang H;Chen R;Wang Y;Zhao X;Yu J

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去泛素化酶BAP 1在多种恶性肿瘤中是一种重要的肿瘤抑制因子,但其在前列腺癌(PCa)中的功能和关键底物尚不清楚。在这里,我们报告,BAP 1的mRNA和蛋白表达水平下调,在临床PCa标本。BAP 1可以物理结合并去泛素化PTEN,这抑制了PTEN的泛素化介导的降解,从而稳定了PTEN蛋白。在PCa细胞中异位表达的BAP 1增加PTEN蛋白水平,随后抑制AKT信号通路,从而抑制PCa进展。相反,PCa细胞中BAP 1的敲除会导致PTEN蛋白水平下降和Akt信号通路激活,从而促进恶性转化和癌症转移。然而,这些可以通过PTEN的重新表达来逆转。更重要的是,我们发现BAP 1蛋白水平与相当一部分人类癌症中的PTEN正相关。这些发现表明,BAP 1是PTEN的一种重要的去泛素化酶,其稳定性和BAP 1-PTEN信号传导轴在肿瘤抑制中起着至关重要的作用。
Deubiquitinase BAP1 is an important tumor suppressor in several malignancies, but its functions and critical substrates in prostate cancer (PCa) remain unclear. Here, we report that the mRNA and protein expression levels of BAP1 are downregulated in clinical PCa specimens. BAP1 can physically bind to and deubiquitinate PTEN, which inhibits the ubiquitination‐mediated degradation of PTEN and thus stabilizes PTEN protein. Ectopically expressed BAP1 in PCa cells increases PTEN protein level and subsequently inhibits the AKT signaling pathway, thus suppressing PCa progression. Conversely, knockdown of BAP1 in PCa cells leads to the decrease in PTEN protein level and the activation of the Akt signaling pathway, therefore promoting malignant transformation and cancer metastasis. However, these can be reversed by the re‐expression of PTEN. More importantly, we found that BAP1 protein level positively correlates with PTEN in a substantial fraction of human cancers. These findings demonstrate that BAP1 is an important deubiquitinase of PTEN for its stability and the BAP1‐PTEN signaling axis plays a crucial role in tumor suppression.
DOI: 10.1126/science.1194472
发表时间: 2010-12-03
期刊: Science (New York, N.Y.)
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