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lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2

  • Authors:
    • Yiqiang Cao
    • Wenying Chai
    • Yonggang Wang
    • Dang Tang
    • Dongchuan Shao
    • Hai Song
    • Jiang Long
  • View Affiliations / Copyright

    Affiliations: Department of Neurosurgery, First People's Hospital of Kunming, Kunming, Yunnan 650032, P.R. China, Department of Breast Surgery, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
    Copyright: © Cao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 533
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    Published online on: May 25, 2021
       https://doi.org/10.3892/mmr.2021.12172
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Abstract

Temozolomide (TMZ) is currently one of the first‑line drugs used for the treatment of high‑grade gliomas. However, TMZ resistance results in unsatisfactory therapeutic effects in gliomas. Cancer stem cells (CSCs) have recently been determined to serve a pivotal regulatory role in tumor metastasis, recurrence and chemoresistance. In addition, numerous reports have shown that long non‑coding RNAs (lncRNAs) exert an essential role in the occurrence and development of tumors, and can be used as biomarkers for tumor diagnosis and treatment. Among them, studies have revealed that taurine upregulated gene 1 (TUG1) exhibits an important regulatory effect on the malignant biological behavior of glioma cells. Moreover, it has been reported that enhancer of Zeste homolog 2 polycomb repressive complex subunit 2 (EZH2) promotes tumorigenesis, including in glioma. However, the underlying mechanism of the interaction of TUG1 and EZH2 with CSCs of glioma remains elusive, and thus requires further clarification. The present study aimed to explore the role of TUG1 and EZH2 in TMZ resistance in glioma. Cell Counting Kit‑8, colony formation,sphere formation and Annexin V‑FITC/PI assays were used to detect the proliferation, clone formation efficiency, stemness and apoptosis of TMZ‑resistant glioma cells. Xenograft tumor assay was used to detect the effect of TUG1 on the tumorigenesis of TMZ‑resistant glioma cells. The present findings demonstrated that TUG1 exhibited a low expression in glioma cells, while EZH2 expression was the opposite. Moreover, it was observed that A172/TMZ cells possessed higher CSCs‑like properties compared with parent cells, and that TUG1 and EZH2 were abnormally expressed in A172/TMZ cells. Knockdown of TUG1 or overexpression of EZH2 promoted A172/TMZ cell proliferation and CSCs‑like properties, as well as inhibited their apoptosis, thereby enhancing the TMZ resistance of A172/TMZ cells. Furthermore, it was found that TUG1 alleviated the TMZ resistance of A172/TMZ cells by inhibiting EZH2 expression. Of note, overexpression of TUG1 inhibited the tumorigenicity of A172/TMZ cells by downregulating EZH2 expression in vivo. Collectively, the present study demonstrated that TUG1 served an essential regulatory role in TMZ resistance of gliomas.
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Copy and paste a formatted citation
Spandidos Publications style
Cao Y, Chai W, Wang Y, Tang D, Shao D, Song H and Long J: lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2. Mol Med Rep 24: 533, 2021.
APA
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., & Long, J. (2021). lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2. Molecular Medicine Reports, 24, 533. https://doi.org/10.3892/mmr.2021.12172
MLA
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., Long, J."lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2". Molecular Medicine Reports 24.1 (2021): 533.
Chicago
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., Long, J."lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2". Molecular Medicine Reports 24, no. 1 (2021): 533. https://doi.org/10.3892/mmr.2021.12172
Copy and paste a formatted citation
x
Spandidos Publications style
Cao Y, Chai W, Wang Y, Tang D, Shao D, Song H and Long J: lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2. Mol Med Rep 24: 533, 2021.
APA
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., & Long, J. (2021). lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2. Molecular Medicine Reports, 24, 533. https://doi.org/10.3892/mmr.2021.12172
MLA
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., Long, J."lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2". Molecular Medicine Reports 24.1 (2021): 533.
Chicago
Cao, Y., Chai, W., Wang, Y., Tang, D., Shao, D., Song, H., Long, J."lncRNA TUG1 inhibits the cancer stem cell‑like properties of temozolomide‑resistant glioma cells by interacting with EZH2". Molecular Medicine Reports 24, no. 1 (2021): 533. https://doi.org/10.3892/mmr.2021.12172
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