SPOP suppresses prostate cancer through regulation of CYCLIN E1 stability.

SPOP suppresses prostate cancer through regulation of CYCLIN E1 stability.
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SPOP 通过调节 CYCLIN E1 稳定性来抑制前列腺癌。

DOI:
10.1038/s41418-018-0198-0
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发表时间:
2019-06
影响因子:
12.4
通讯作者:
Wu M
Wu M
中科院分区:
生物学1区
文献类型:
--
作者:
Ju LG;Zhu Y;Long QY;Li XJ;Lin X;Tang SB;Yin L;Xiao Y;Wang XH;Li L;Zhang L;Wu M

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SPOP是CUL 3/SPOP/RBX 1复合物的重要亚基之一,与肿瘤的发生密切相关。然而,它在不同癌症中的确切作用仍然存在争议。在这里,我们确定细胞周期蛋白E1,作为一种新的底物SPOP。SPOP直接与细胞周期蛋白E1相互作用,并特异性调节其在前列腺癌细胞系中的稳定性。SPOP/CUL 3/RBX 1复合物通过多聚泛素化调节细胞周期蛋白E1的稳定性CDK 2与SPOP竞争细胞周期蛋白E1的相互作用,表明SPOP可能调节无CDK 2的细胞周期蛋白E1的稳定性。细胞周期蛋白E1表达挽救了SPOP抑制的前列腺癌细胞的增殖、迁移和肿瘤形成。此外,我们还发现SPOP在前列腺癌和CCRC细胞系中选择性地调节底物的稳定性和信号通路,这表明SPOP调节底物特异性存在复杂的机制。总而言之,我们揭示了SPOP抑制前列腺癌的新机制,并提供证据表明SPOP在前列腺癌和CCRC中具有双重功能。
SPOP is one of the important subunits for CUL3/SPOP/RBX1 complex tightly connected with tumorigenesis. However, its exact roles in different cancers remain debatable. Here, we identify CYCLIN E1, as a novel substrate for SPOP. SPOP directly interacts with CYCLIN E1 and specific regulates its stability in prostate cancer cell lines. SPOP/CUL3/RBX1 complex regulates CYCLIN E1 stability through poly-ubiquitination. CDK2 competes with SPOP for CYCLIN E1 interaction, suggesting that SPOP probably regulates the stability of CDK2-free CYCLIN E1. CYCLIN E1 expression rescued proliferation, migration, and tumor formation of prostate cancer cell suppressed by SPOP. Furthermore, we found SPOP selectively regulates the substrates’ stability and signaling pathways in prostate cancer and CCRC cell lines, suggesting that complicated mechanisms exist for SPOP to regulate substrate specificity. Altogether, we have revealed a novel mechanism for SPOP in suppressing prostate cancer and provided evidence to show SPOP has dual functions in prostate cancer and CCRC.
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