Oncotarget

Research Papers:

SphK2 over-expression promotes osteosarcoma cell growth

Dawei Xu, Hao Zhu, Chengniu Wang, Wei Zhao, Genxiang Liu, Guofeng Bao, Daoran Cui, Jianbo Fan, Fei Wang, Huricha Jin and Zhiming Cui _

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Oncotarget. 2017; 8:105525-105535. https://doi.org/10.18632/oncotarget.22314

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Abstract

Dawei Xu1,*, Hao Zhu2,*, Chengniu Wang3, Wei Zhao1, Genxiang Liu2, Guofeng Bao1, Daoran Cui1, Jianbo Fan1, Fei Wang1, Huricha Jin1 and Zhiming Cui1

1Department of Orthopaedics, The Second Affiliated Hospital of Nantong University, Nantong, China

2Department of Orthopaedics, The Fourth Affiliated Hospital of Nantong University, Yancheng, China

3Basic Medical Research Centre, Medical College, Nantong University, Nantong, China

*These authors have contributed equally to this work

Correspondence to:

Zhiming Cui, email: zhimingcui_orth1@163.com

Keywords: osteosarcoma; sphk2; microRNA-19a-3p; oncotarget

Received: May 30, 2017     Accepted: July 13, 2017     Published: November 06, 2017

ABSTRACT

It is needed to explore novel biological markers for early diagnosis and treatment of human osteosarcoma. Sphingosine kinase 2 (SphK2) expression and potential functions in osteosarcoma were studied. We demonstrate that SphK2 is over-expressed in multiple human osteosarcoma tissues and established human osteosarcoma cell lines. Silence of SphK2 by targeted-shRNAs inhibited osteosarcoma cell growth, and induced cell apoptosis. On the other hand, exogenous over-expression of SphK2 could further promote osteosarcoma cell growth. Notably, microRNA-19a-3p (“miR-19a-3p”) targets the 3’ UTR (untranslated region) of SphK2 mRNA. Remarkably, forced-expression of miR-19a-3p silenced SphK2 and inhibited osteosarcoma cell growth. In vivo, SphK2 silence, by targeted-shRNA or miR-19a-3p, inhibited U2OS tumor growth in nude mice. These results suggest that SphK2 could be a novel and key oncotarget protein for OS cell progression.


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