Circular RNA 0102049 suppresses the progression of osteosarcoma through modulating miR-520g-3p/PLK2 axis

ABSTRACT

Circular RNAs (circRNAs) are a type of non-coding RNAs generated from back splicing to enhance or inhibit the progression of multiple human cancers including osteosarcoma (OS). Although circ_0102049 has been found to be highly expressed in OS cell lines, the role and specific mechanism of circ_0102049 in OS remains unclear. Here, we found that silence of circ_0102049 could significantly exacerbate the tumorigenesis of OS in vivo through sponging microRNA-520g-3p. Polo-like kinase 2 (PLK2) was predicted to be a target of miR-520g-3p, and luciferase reporter assay revealed that overexpression of miR-520g-3p dramatically suppressed the expression of PLK2, whereas miR-520g-3p inhibitor promoted the PLK2 expression. Moreover, the silence of circ_0102049 could markedly promote the proliferation, invasion, migration and cell-cycle promotion while inhibiting the apoptosis of OS cell line MG63 cells in vitro through regulating miR-520g-3p/PLK2 axis. Taken together, the present study indicated that circ_0102049 suppressed the progression of osteosarcoma via modulating miR-520g-3p/PLK2/TAp73 axis, providing a potential therapeutic target for OS.

Graphical abstract

KEYWORDS:

• Osteosarcoma
• circ_0102049
• miR-520g-3p
• PLK2

Highlights

1. Silence of circ_0102049 promotes the tumorigenesis of OS by targeting miR-520g-3p.

2. Circ_0102049 regulates OS cell proliferation, migration and invasion through miR-520g-3e/PLK2 axis.

3. Circ_0102049 and miR-520g-3e might be novel therapeutic target of OS.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data of this study are available from the corresponding author upon reasonable request.

Additional information

Funding

This work was supported by the grants from the Natural Science Foundation of China (No.81974323,81871355), Natural Science Foundation of Guangdong Province (No. 2017A030307012, 2018A0303070013、 2019A1515011638、 2020A1515010055 and S2012040007947); Guangzhou Science and Technology Program Project (No. 201804010082 and 202002030485)、 The Scientific Research Foundation for Youth Scholars of Southern Medical University, Grant/Award Number: B1012045.