Transcriptional repressor Kaiso promotes epithelial to mesenchymal transition and metastasis in prostate cancer through direct regulation of miR-200c.

Transcriptional repressor Kaiso promotes epithelial to mesenchymal transition and metastasis in prostate cancer through direct regulation of miR-200c.
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DOI:
10.1016/j.canlet.2018.04.044
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发表时间:
2018-09-01
期刊:
影响因子:
9.7
通讯作者:
Yates C
Yates C
中科院分区:
医学1区
文献类型:
--
作者:
Abisoye-Ogunniyan A;Lin H;Ghebremedhin A;Salam AB;Karanam B;Theodore S;Jones-Trich J;Davis M;Grizzle W;Wang H;Yates C

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DNA 甲基化导致 miR-200 家族丧失,导致癌细胞经历上皮间质转化 (EMT) 和转移。在这项研究中,我们确定转录抑制因子 Kaiso 直接结合 miR-200 家族的甲基化区域,并且通过 5-aza 处理可以逆转这种情况。 sh-Kaiso PC-3 细胞显示 miR-200-a/b/c、miR-141 和 miR-429 表达增加,其中 miR-200c 表现出最显着的增加。有趣的是,EGFR 的过度表达或 EGF 治疗会降低 miR-200c 的表达,而在使用 EGFR 特异性激酶抑制剂 PD153035 治疗后,这种情况会逆转。然而,EGF 对 sh-Kaiso DU-145 或 PC-3 细胞系中的 miR-200c 没有显着影响,表明 Kaiso 通过激活 EGFR 信号传导来沉默 miR-200c。 LNCaP 细胞中 Kaiso 的过表达导致 miR-200-a/b/c、miR-141 和 miR-429 的表达降低,同时 ZEB1、p-EGFR 和总 EGFR 水平的表达增加。 PC-3 细胞中 miR200c 的过表达导致 EGFR、ZEB1、ERK1/2 和 Kaiso 的表达降低。此外,sh-Kaiso PC-3 还表现出减少体内肿瘤形成和转移的作用。因此,我们的数据表明 EGFR 信号传导通过 Kaiso 与启动子中的甲基化区域结合来调节 miR-200 家族的沉默。
The loss of miR-200 family, through DNA methylation, results in cancer cells undergoing an epithelial to mesenchymal transition (EMT), and metastasis. In this study, we established that the transcriptional repressor Kaiso directly binds methylated regions of the miR-200 family, and this is reversed with 5-aza treatment. sh-Kaiso PC-3 cells display increased miR-200-a/b/c, miR-141, and miR-429 expression, with miR-200c demonstrating the most significant increase. Interestingly, overexpression of EGFR or treatment with EGF decreases miR-200c expression and this is reversed after treatment with EGFR specific kinase inhibitor PD153035. However, EGF did not have a significant effect on miR-200c in sh-Kaiso DU-145 or PC-3 cell lines, suggesting Kaiso silences miR-200c through the activation of EGFR signaling. Overexpression of Kaiso in LNCaP cells results in decreased expression of miR-200-a/b/c, miR-141, and miR-429, along with increased expression of ZEB1, p-EGFR and total EGFR levels. Overexpression of miR200c in PC-3 cells results in decreased expression of EGFR, ZEB1, ERK1/2 and Kaiso. Additionally, sh-Kaiso PC-3 demonstrates reduced in vivo tumor formation and metastasis. Thus, our data suggests that EGFR signaling regulates the silencing of miR-200 family through Kaiso binding to methylated regions in the promoter.
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