MicroRNA-214 regulates osteosarcoma survival and growth by directly targeting phosphatase and tensin homolog

Wang,Xuming; Sun,Jiabing; Fu,Chunjiang; Wang,Dewei; Bi,Zhenggang

doi:10.3892/mmr.2014.2616

MicroRNA-214 regulates osteosarcoma survival and growth by directly targeting phosphatase and tensin homolog

Authors:
- Xuming Wang
- Jiabing Sun
- Chunjiang Fu
- Dewei Wang
- Zhenggang Bi
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Affiliations: Department of Orthopedics, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
Published online on: October 9, 2014 https://doi.org/10.3892/mmr.2014.2616
Pages: 3073-3079

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Abstract

An increasing number of microRNAs (miRNAs) have been identified as diagnostic and prognostic biomarkers, as well as additional therapeutic tools, in skeletal diseases. Recent studies have established the pathophysiological role of miR‑214, using human osteoporotic bone specimens. However, miR‑214 expression levels and the underlying regulatory mechanism in human osteosarcoma remain unclear. Quantitative polymerase chain reaction (qPCR) was used to examine the expression of miR‑214 in human osteosarcoma tissues and cells. Transfection of the cells with either a miR‑214 expressing‑plasmid, mimic or inhibitor was performed, in order to investigate the role of miR‑214 in osteosarcoma. In this study, miR‑214 was shown to be significantly increased in the majority of 15 examined osteosarcoma tissues and in the Saos‑2 human osteosarcoma cell line. Overexpression of miR‑214 in Saos‑2 cells induced cell proliferation, while inhibition of miR‑214 promoted Saos‑2 cell apoptosis in vitro. Furthermore, ectopic expression of miR‑214 markedly promoted osteosarcoma development in a subcutaneous xenotransplantation model in BALB/c athymic nude mice. The role of miR‑214 in osteocarcinogenesis was further investigated and phosphatase and tensin homolog (PTEN) was determined to be a direct target of miR‑214 in Saos‑2 cells. The proliferation‑promoting effect of PTEN knockdown was similar to that of miR‑214 overexpression. This study revealed that miR‑214 exerted a crucial role in promoting osteosarcoma progression and this suggests that modulation of miR‑214 levels may provide a novel therapeutic approach in cancer treatment.

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