Osteosarcoma is the most common primary bone tumor in children and adolescents. Understanding the basic molecular mechanisms in developing cancer can be helpful in developing alternative treatment strategies. The relationship between dysregulated non-coding RNAs' (ncRNA) expression level and osteosarcoma was detected. Among those ncRNAs, the expression levels of miR-664a were detected to be upregulated and MEG3 long non-coding RNA levels were detected to be downregulated in osteosarcoma tissue and cell lines. In this study, miR-664a inhibitor was used in order to investigate the changes in the expression levels of MEG3 gene and miR-664a in osteosarcoma cancer cell line (U2-OS) and human osteoblast cell line (hFOB 1.19). According to our results, the expression level of MEG3 gene was increased while the expression level of miR-664a was decreased, as expected. In addition, changes in expression level of MEG3 and miR-644a interferes with the migration of osteosarcoma cells migration speed of osteosarcoma cells. These results are found to be statistically significant (p < 0.05). As a result of this study, it was shown that the upregulated expression of miR-664a could have an inhibitory effect on MEG3 gene expression and migration of osteosarcoma cells.
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