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Tbx2 confers poor prognosis in glioblastoma and promotes temozolomide resistance with change of mitochondrial dynamics

Authors Yi F, Du J, Ni W, Liu W

Received 6 October 2016

Accepted for publication 30 November 2016

Published 20 February 2017 Volume 2017:10 Pages 1059—1069

DOI https://doi.org/10.2147/OTT.S124012

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Ashok Kumar Pandurangan

Peer reviewer comments 4

Editor who approved publication: Dr Yao Dai

Fuxin Yi, Jianzhou Du, Weimin Ni, Weixian Liu

Department of Neurosurgery, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, People’s Republic of China

Abstract: Tbx2 is a cancer-related protein that was found to be overexpressed in several human malignancies. The present study aims to investigate the clinical significance and biological role of Tbx2 in human astrocytoma. We examined its protein expression in 102 cases of astrocytoma tissues using immunohistochemical staining. Negative Tbx2 staining was observed in normal astrocytes, and positive nuclear staining was found in 41 out of 102 astrocytoma specimens. The rate of Tbx2 overexpression in pylocytic astrocytoma, diffuse astrocytoma, anaplastic astrocytoma, and glioblastoma multiform (GBM) were 0%, 26.1%, 40%, and 52%, respectively. Tbx2 overexpression correlated with poor prognosis in patients with astrocytoma or GBM. Tbx2 plasmid transfection was performed in A172 cells, and Tbx2 siRNA knockdown was carried out in U251 cells. Cell Counting Kit-8, cell cycle analysis, and matrigel invasion assay showed that Tbx2 overexpression upregulated cell proliferation, G1-S transition, and invasion, with corresponding change of cyclin D1, p21, and MMP 2 and 9. Importantly, we demonstrated that Tbx2 reduced apoptosis and conferred resistance to temozolomide in GBM cell lines. Further experiments showed that Tbx2 could regulate mitochondrial fission/fusion balance. Western blot showed that Tbx2 overexpression reduced caspase 3 cleavage, while it induced Bcl-2 and p-Drp1 upregulation. In conclusion, our results indicated that Tbx2 might serve as an indicator for poor prognosis and also be useful as an important therapeutic in human GBM, which inhibits apoptosis through regulation of mitochondrial function.

Keywords: Tbx2, immunohistochemistry, glioblastoma, mitochondrial function

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