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The present study aimed to investigate the involvement of long intergenic non-coding RNA for kinase activation (LINK-A) long non-coding RNA (lncRNA) in osteosarcoma. Plasma levels of LINK-A lncRNA and transforming growth factor β1 (TGF-β1) were measured by reverse transcription-quantitative polymerase chain reaction and ELISA, respectively. Correlation between LINK-A lncRNA and TGF-β1 was analyzed by Pearson correlation coefficient. LINK-A lncRNA and TGF-β1 were upregulated in patients with osteosarcoma compared with healthy controls. LINK-A lncRNA and TGF-β1 were positively correlated in the two groups. LINK-A lncRNA short hairpin RNAs (shRNAs) were transfected into osteosarcoma cell lines and Transwell migration assay, Matrigel invasion assay and flow cytometry were used to evaluate cell migration, invasion and stemness, respectively. Effects of LINK-A lncRNA silencing and overexpression on TGF-β1 expression were analyzed by western blotting. LINK-A lncRNA shRNA silencing inhibited, whereas TGF-β1 treatment promoted cell migration, invasion and stemness. LINK-A lncRNA silencing inhibited TGF-β1 expression, whereas TGF-β1 treatment had no effects on LINK-A lncRNA expression. TGF-β1 reduced the inhibitory effects of LINK-A lncRNA knockdown on cancer cell migration, invasion and stemness. These data indicated that LINK-A lncRNA is upregulated in osteosarcoma and may regulate migration, invasion and stemness of osteosarcoma cells through TGF-β1.

LINK‑A lncRNA is upregulated in osteosarcoma and regulates migration, invasion and stemness of osteosarcoma cells