PLZF mediates the PTEN/AKT/FOXO3a signaling in suppression of prostate tumorigenesis.

PLZF mediates the PTEN/AKT/FOXO3a signaling in suppression of prostate tumorigenesis.
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PLZF 介导 PTEN/AKT/FOXO3a 信号传导抑制前列腺肿瘤发生。

DOI:
10.1371/journal.pone.0077922
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Feng L
Feng L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cao J;Zhu S;Zhou W;Li J;Liu C;Xuan H;Yan J;Zheng L;Zhou L;Yu J;Chen G;Huang Y;Yu Z;Feng L

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早幼粒细胞白血病锌指(PLZF)蛋白表达与包括前列腺癌(PCa)在内的人类癌症的进展密切相关。然而,PLZF抑制前列腺肿瘤发生的信号通路的相应背景仍然非常未知。在这里,我们报告,PLZF是前列腺癌中的PTEN信号通路的下游介质。我们发现,PLZF的表达与PTEN的表达在前列腺癌标本的队列密切相关。有趣的是,PTEN拯救和磷酸肌醇3-激酶(PI 3 K)抑制剂LY 294002处理都增加了前列腺癌细胞系中PLZF的表达。荧光素酶报告基因检测和染色质免疫沉淀检测结果表明,经PI 3 K/AKT磷酸化的转录因子FOXO 3a可与PLZF基因启动子直接结合。这些结果表明,PTEN通过AKT/FOXO 3a调节PLZF表达。此外,我们的动物实验也证明PLZF能够抑制体内前列腺肿瘤的发生。总之,我们的研究定义了一个PTEN/PLZF通路,并将为开发前列腺癌的治疗策略提供新的思路。
Promyelocytic leukemia zinc finger (PLZF) protein expression is closely related to the progression of human cancers, including prostate cancer (PCa). However, the according context of a signaling pathway for PLZF to suppress prostate tumorigenesis remains greatly unknown. Here we report that PLZF is a downstream mediator of the PTEN signaling pathway in PCa. We found that PLZF expression is closely correlated with PTEN expression in a cohort of prostate cancer specimens. Interestingly, both PTEN rescue and phosphoinositide 3-kinase (PI3K) inhibitor LY294002 treatment increase the PLZF expression in prostate cancer cell lines. Further, luciferase reporter assay and chromatin immunoprecipitation assay demonstrate that FOXO3a, a transcriptional factor phosphorylated by PI3K/AKT, could directly bind to the promoter of PLZF gene. These results indicate that PTEN regulates PLZF expression by AKT/FOXO3a. Moreover, our animal experiments also demonstrate that PLZF is capable of inhibiting prostate tumorigenesis in vivo. Taken together, our study defines a PTEN/PLZF pathway and would shed new lights for developing therapeutic strategy of prostate cancer.
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