Multiple tumor suppressor microRNAs regulate telomerase and TCF7, an important transcriptional regulator of the Wnt pathway.

Multiple tumor suppressor microRNAs regulate telomerase and TCF7, an important transcriptional regulator of the Wnt pathway.
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DOI:
10.1371/journal.pone.0086990
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Bose HR Jr
Bose HR Jr
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hrdličková R;Nehyba J;Bargmann W;Bose HR Jr

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人类TERT (hTERT) 基因编码端粒酶催化亚基,在端粒酶调节中发挥作用。端粒酶在超过 90% 的人类恶性肿瘤中被激活,了解端粒酶的调控方式对于实施成功的抗癌疗法至关重要。 microRNA (miRNA) 是真核细胞基因表达的重要调节因子,但其在端粒酶调节中的作用的证据尚未有记录。为了确定 hTERT 活性是否受多个 miRNA 调节,在荧光素酶测定中使用含有 hTERT 3'UTR 的报告基因评估了在 hTERT 3'UTR 中具有推定结合位点的 8 个 miRNA 以及 miR-138-5p。六种 miRNA(let-7g*、miR-133a、miR-138-5p、miR-342-5p、miR-491-5p 和 miR-541-3p)特异性抑制报告荧光素酶驱动构建体的表达,let-7g*、miR-133a、miR-138-5p 和 miR-491-5p 也下调内源性细胞中的端粒酶活性。此外,所有六种 miRNA 均显着抑制细胞增殖。 miRNA(miR-133a、miR-138-5p、342-5p、491-5p、541-3p)还预测了参与 Wnt 信号传导的三个基因(TCF7、MSI1 和 PAX5)3'UTR 内的结合位点。这些 miRNA 抑制含有这些基因 3'UTR 的荧光素酶报告构建体的表达,并下调 TCF7 转录因子的蛋白表达,该转录因子介导经典 Wnt 通路。总之,这些结果表明存在涉及 hTERT 和 Wnt 通路的 miRNA 调控网络。
The human TERT (hTERT) gene encodes the telomerase catalytic subunit which plays a role in telomerase regulation. Telomerase is activated in more than 90% of all human malignancies and understanding how telomerase is regulated is necessary for implementation of successful anti-cancer therapies. microRNAs (miRNAs) are important regulators of gene expression in eukaryotic cells but evidence of their role in telomerase regulation has not been documented. To determine whether hTERT activity is regulated by multiple miRNAs, eight miRNAs which have putative binding sites in the hTERT 3′UTR together with miR-138-5p were evaluated in luciferase assays with a reporter containing the hTERT 3′UTR. Six miRNAs (let-7g*, miR-133a, miR-138-5p, miR-342-5p, miR-491-5p, and miR-541-3p) specifically inhibited the expression of the reporter luciferase-driven constructs and let-7g*, miR-133a, miR-138-5p, and miR-491-5p also downregulated endogenous telomerase activity in cells. Moreover, all six miRNAs significantly inhibited cell proliferation. miRNAs (miR-133a, miR-138-5p, 342-5p, 491-5p, 541-3p) also have predicted binding sites within the 3′UTR of three genes involved in Wnt signaling (TCF7, MSI1, and PAX5). These miRNAs inhibited the expression of the luciferase reporter constructs containing 3′UTRs of these genes and downregulated protein expression of the TCF7 transcription factor, which mediates the canonical Wnt pathway. Together, these results suggest the existence of a miRNA regulatory network involving the hTERT and Wnt pathway.
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