CircGLIS3 Promotes High-Grade Glioma Invasion via Modulating Ezrin Phosphorylation.

CircGLIS3 Promotes High-Grade Glioma Invasion via Modulating Ezrin Phosphorylation.
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CircGLIS3 通过调节 Ezrin 磷酸化促进高级别胶质瘤侵袭

DOI:
10.3389/fcell.2021.663207
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发表时间:
2021
影响因子:
5.5
通讯作者:
Ke Y
Ke Y
中科院分区:
生物学2区
文献类型:
--
作者:
Li Y;Chen J;Chen Z;Xu X;Weng J;Zhang Y;Mo Y;Liu Y;Wang J;Ke Y

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高级别胶质瘤具有高度侵袭性和恶性性,对综合治疗耐药,易复发。进一步了解高级别胶质瘤中环状RNA(circRNA)的生物学功能有助于提高治疗效果。在此,通过微阵列和实时定量逆转录PCR(qRT-PCR)验证了仅在高级别胶质瘤中上调的circRNA,circGLIS 3(hsa_circ_0002874,源自GLIS 3的外显子2)。通过体外和体内的功能实验来评估circGLIS 3在胶质瘤中的作用。采用原位杂交、RNA下拉、RNA免疫沉淀和免疫组化等方法研究其作用机制。共培养的脑内皮细胞与胶质瘤探讨了外泌体衍生的circGLIS 3在胶质瘤微环境中的作用。我们发现,上调circGLIS 3促进胶质瘤细胞的迁移和侵袭,并在荷瘤小鼠中表现出攻击性特征。机制上,我们发现circGLIS 3可以促进Ezrin T567磷酸化水平。此外,circGLIS 3可通过exosomes被胶质瘤分泌并诱导内皮细胞血管生成。我们的研究结果表明,circGLIS 3在高级别胶质瘤中上调,并通过调节Ezrin T567磷酸化来促进胶质瘤的侵袭和血管生成。
High-grade glioma is highly invasive and malignant, resistant to combined therapies, and easy to relapse. A better understanding of circular RNA (circRNA) biological function in high-grade glioma might contribute to the therapeutic efficacy. Here, a circRNA merely upregulated in high-grade glioma, circGLIS3 (hsa_circ_0002874, originating from exon 2 ofGLIS3), was validated by microarray and Real-time quantitative reverse transcription PCR (qRT-PCR). The role of circGLIS3 in glioma was assessed by functional experiments bothin vitroandin vivo. Fluorescencein situhybridization (FISH), RNA pull-down, RNA immunoprecipitation (RIP), and immunohistochemical staining were performed for mechanistic study. Cocultured brain endothelial cells with glioma explored the role of exosome-derived circGLIS3 in the glioma microenvironment. We found that upregulation of circGLIS3 promoted glioma cell migration and invasion and showed aggressive characteristics in tumor-bearing mice. Mechanistically, we found that circGLIS3 could promote the Ezrin T567 phosphorylation level. Moreover, circGLIS3 could be excreted by glioma through exosomes and induced endothelial cell angiogenesis. Our findings indicate that circGLIS3 is upregulated in high-grade glioma and contributes to the invasion and angiogenesis of glioma via modulating Ezrin T567 phosphorylation.
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