Oncotarget

Research Papers:

Silencing of R-Spondin1 increases radiosensitivity of glioma cells

Xuefeng Gu, Xuefeng Wang, Hong Xiao, Guoda Ma, Lili Cui, You Li, Haihong Zhou, Wandong Liang, Bin Zhao and Keshen Li _

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Oncotarget. 2015; 6:9756-9765. https://doi.org/10.18632/oncotarget.3395

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Abstract

Xuefeng Gu1,2,*, Xuefeng Wang3,*, Hong Xiao3,*, Guoda Ma1, Lili Cui1, You Li2, Haihong Zhou4, Wandong Liang5, Bin Zhao2, Keshen Li1

1Institute of Neurology, Guangdong Medical College, Zhanjiang 524001, China

2Guangdong Key Laboratory of Age-Related Cardiac and Cerebral Diseases, Affiliated Hospital of Guangdong Medical College, Zhanjiang 524001, China

3Department of Neurosurgery, Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, China

4Department of Neurology, Affiliated Hospital of Guangdong Medical College, Zhanjiang 524001, China

5Renji College, Wenzhou Medical University, Wenzhou 325000, China

*These authors have contributed equally to this work

Correspondence to:

Keshen Li, e-mail: [email protected]

Bin Zhao, e-mail: [email protected]

Keywords: Rspo1, glioma, radiation

Received: December 22, 2014     Accepted: February 17, 2015     Published: March 12, 2015

ABSTRACT

Although radiation therapy is the most effective postoperative adjuvant treatment, it does not substantially improve the long-term outcomes of glioma patients because of the characteristic radioresistance of glioma. We found that R-Spondin1 (Rspo1) expression was elevated in high-grade gliomas and was associated with worse overall survival and disease-free survival. Rspo1 expression was also associated with reduced survival rates in glioma patients after treatment with radiotherapy and temozolomide (RT-TMZ). Importantly, Rspo1 was dramatically upregulated after radiation treatment in patients with glioma. Rspo1 silencing by shRNA potentiated glioma cell death upon radiation treatment. In a xenograft nude mouse model, combining radiation and silencing of Rspo1 potentiated tumor growth inhibition. Thus, combining radiotherapy with silencing of Rspo1 is a potential therapeutic approach.


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