Long non-coding RNA LINC00525 interacts with miR-31–5p and miR-125a-5p to act as an oncogenic molecule in spinal chordoma.

LINC00525 is a new-researched long non-coding RNA (lncRNA) in a few cancers. This study aims at researching the function of LINC00525 in spinal chordoma and the underlying mechanism of action. LINC00525, microRNA-31–5p (miR-31–5p) and microRNA-125a-5p (miR-125a-5p) detection was performed by quantitative real-time polymerase chain reaction (qRT-PCR). We found the high expression of LINC00525 but the low levels of miR-31–5p and miR-125a-5p in spinal chordoma tissues. After LINC00525 was downregulated in spinal chordoma cells, there were inhibitory effects on cell proliferation, migration, invasion and EMT but a promoting effect on cell apoptosis. MiR-31–5p and miR-125a-5p were the downstream targets of LINC00525. The function of LINC00525 knockdown in spinal chordoma cells were achieved by upregulating miR-31–5p and miR-125a-5p. Tumorigenesis of spinal chordoma in vivo was also inhibited by knockdown of LINC00525 via the promotion of miR-31–5p and miR-125a-5p. All these results suggested that LINC00525 targeted miR-31–5p and miR-125a-5p to promote the tumorigenesis and progression of spinal chordoma. LINC00525 can be a novel molecular target in spinal chordoma. • LINC00525 knockdown inhibits cell proliferation and metastasis while enhances cell apoptosis in spinal chordoma cells. • LINC00525 targets miR-31–5p and miR-125a-5p. • LINC00525 contributes to tumor growth via negatively regulating miR-31–5p and miR-125a-5p in vivo. [ABSTRACT FROM AUTHOR]