Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, Shaanxi Province, China.
Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, Shaanxi Province, China.
Biochem Biophys Res Commun. 2019 Apr 9;511(3):619-625. doi: 10.1016/j.bbrc.2019.02.112. Epub 2019 Feb 28.
The abnormal expression of microRNAs (miRNAs) contributes to the development and progression of cancer. Recent studies have reported that miRNA-520e (miR-520e) is dysregulated in multiple cancers and is associated with tumor progression. However, the role of miR-520e in glioma has not been fully investigated. In this study, we investigated the function of miR-520e and its regulation by a molecular mechanism in gliomas. Our results showed that miR-520e expression was significantly downregulated in glioma tissues and cell lines. The overexpression of miR-520e repressed the proliferation, colony formation, and invasive potential of glioma cells, while the inhibition of miR-520e showed the opposite effect. The oncogenic gene fibroblast growth factor 19 (FGF19) was identified as a downstream target gene of miR-520e. The knockdown of FGF19 restricted the proliferation and invasion of glioma cells. Moreover, FGF19 knockdown or miR-520e overexpression decreased the expression of β-catenin and suppressed the transcriptional activity of Wnt/β-catenin signaling. Notably, the restoration of FGF19 expression partially reversed the miR-520e-mediated antitumor effect. In conclusion, our results demonstrate that miR-520e restricts the proliferation and invasion of glioma cells through the downregulation of FGF19/Wnt/β-catenin signaling, highlighting an importance of miR-520e/FGF19/Wnt/β-catenin signaling in gliomagenesis and suggesting miR-520e as a potential therapeutic target for gliomas.
miRNAs(miRNAs)的异常表达有助于癌症的发展和进展。最近的研究报告称,miRNA-520e(miR-520e)在多种癌症中失调,与肿瘤进展有关。然而,miR-520e 在神经胶质瘤中的作用尚未得到充分研究。在这项研究中,我们研究了 miR-520e 在神经胶质瘤中的功能及其通过分子机制的调节。我们的结果表明,miR-520e 在神经胶质瘤组织和细胞系中的表达显著下调。miR-520e 的过表达抑制神经胶质瘤细胞的增殖、集落形成和侵袭能力,而 miR-520e 的抑制则表现出相反的效果。成纤维细胞生长因子 19(FGF19)被鉴定为 miR-520e 的下游靶基因。FGF19 的敲低限制了神经胶质瘤细胞的增殖和侵袭。此外,FGF19 敲低或 miR-520e 的过表达降低了β-catenin 的表达并抑制了 Wnt/β-catenin 信号的转录活性。值得注意的是,FGF19 表达的恢复部分逆转了 miR-520e 介导的抗肿瘤作用。总之,我们的结果表明,miR-520e 通过下调 FGF19/Wnt/β-catenin 信号来限制神经胶质瘤细胞的增殖和侵袭,突出了 miR-520e/FGF19/Wnt/β-catenin 信号在神经胶质瘤发生中的重要性,并表明 miR-520e 作为神经胶质瘤的潜在治疗靶点。
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