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LncRNA GAS5-AS1 inhibits glioma proliferation, migration, and invasion via miR‐106b-5p/TUSC2 axis

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Abstract

Glioma is one of the most common malignant tumors and shows a high metastasis rate and poor prognosis. Abnormal expression of long non-coding RNAs (lncRNAs) contributes to various human tumors including gliomas. This study aimed to investigate the regulatory role of the antisense RNA of growth arrest special 5 (GAS5-AS1), a novel lncRNA, in gliomas. Expression of GAS5-AS1 and microRNA-106b-5p (miR-106b-5p) in glioma tissues and cells was detected by quantitative reverse transcription PCR, northern blotting, or fluorescent in situ hybridization. Cell proliferation, migration, and invasion were analyzed by CCK-8 and Transwell assays. BALB/c nude mice were used to establish a glioma xenograft animal model by subcutaneous injection of U251 cells transfected with small interfering RNA targeting GAS5-AS1. A dual-luciferase reporter assay was conducted to confirm the targeting relationship between GAS5-AS1 and miR-106b-5p. GAS5-AS1 expression was downregulated in glioma tissues and cells, and upregulation of GAS5-AS1 expression inhibited glioma cell proliferation, migration, and invasion. GAS5-AS1 expression was correlated with the glioma tumor grade. In nude mice, upregulation of GAS5-AS1 markedly suppressed glioma tumor growth. GAS5-AS1 overexpression significantly increased the miR-106b-5p level in glioma cells, and GAS5-AS1 expression was negatively related to miR-106b-5p expression in glioma tissues. Overexpression of miR-106b-5p reversed the inhibitory effects of GAS5-AS1 upregulation on glioma cell proliferation and metastasis, while restoration of TUSC2 rescued the proliferation and invasion of glioma cells transfected with miR-106b-5p mimics. In summary, lncRNA GAS5-AS1 inhibited glioma proliferation, migration, and invasion by sponging miR-106b-5p and regulating the expression of TUSC2. Our results suggest GAS5-AS1 as a novel target for the treatment and prognosis prediction of gliomas.

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Funding

This work was supported by National Natural Science Foundation of China (81302181) and the Key Research and Development Program of Jiangsu Province (No. BE2019652).

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FL conceived and designed research; WH and YS performed experiments; BH analyzed data; QW interpreted results of experiments; BZ prepared figures; CQ drafted, edited, and revised manuscript.

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Correspondence to Fang Liu.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving animals were in accordance with the ethical standards of Nanjing University. All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of Changzhou No. 2 People’s Hospital, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Huang, W., Shi, Y., Han, B. et al. LncRNA GAS5-AS1 inhibits glioma proliferation, migration, and invasion via miR‐106b-5p/TUSC2 axis. Human Cell 33, 416–426 (2020). https://doi.org/10.1007/s13577-020-00331-z

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