DNAJC5 promotes hepatocellular carcinoma cells proliferation though regulating SKP2 mediated p27 degradation.

DNAJC5 promotes hepatocellular carcinoma cells proliferation though regulating SKP2 mediated p27 degradation.
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DNAJC5 通过调节 SKP2 介导的 p27 降解促进肝细胞癌细胞增殖。

DOI:
10.1016/j.bbamcr.2021.118994
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发表时间:
2021-03
影响因子:
5.1
通讯作者:
Luo Shiwen
Luo Shiwen
中科院分区:
生物学2区
文献类型:
--
作者:
Wang Hailong;Luo Jiayu;Tian Xuesi;Xu Linlin;Zhai Zhenyu;Cheng Minzhang;Chen Limin;Luo Shiwen

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DNAJC 5(DnaJ heat shock protein family,Hsp 40),又称半胱氨酸串联蛋白(casein tandem protein,CSPα),是维持神经组织正常功能的重要蛋白,但其致癌功能尚不清楚。在这里,我们报告了一个独特的机制,潜在的致癌功能的DNAJC 5。DNAJC 5蛋白表达在人肝细胞癌(HCC)组织中高度可检测,并且与HCC患者的不良预后密切相关。DNAJC 5过表达可促进肝癌细胞增殖,并降低细胞周期中G1期细胞的比例。此外,DNAJC 5与SKP 2相互作用,并通过促进SKP 2-p27复合物的形成来增强p27(细胞周期蛋白依赖性激酶受体1B)的降解。相比之下,DNAJC 5敲低挽救了SKP 2介导的p27蛋白水平的降低。这些结果表明DNAJC 5-SKP 2-p27通路是DNAJC 5在HCC中致癌功能的新机制。
DNAJC5 (DnaJ heat shock protein family (Hsp40) member C5), also known as cysteine tandem protein (CSPα), is important for maintaining the normal function of nerve tissues, but its oncogenic function remains unknown. Here, we report a unique mechanism underlying the oncogenic function of DNAJC5. DNAJC5 protein expression is highly detectable in human hepatocellular carcinoma (HCC) tissues and is strongly related to a poor prognosis among HCC patients. DNAJC5 overexpression promotes HCC cell proliferation and reduced the ratio of cells in G1phase of the cell cycle. Furthermore, DNAJC5 interacts with SKP2 and enhances the degradation of p27 (a cyclin-dependent kinase inhibitor1B) by promoting formation of the SKP2-p27 complex. In contrast, DNAJC5 knockdown rescues the SKP2-mediated decrease in p27 protein levels. These results reveal that the DNAJC5-SKP2-p27 pathway is a novel mechanism for the oncogenic function of DNAJC5 in HCC.
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