LAUSR

OBJECTIVE As a new LncRNA, anti-differentiated non-coding RNA (DANCR) plays an important role in tumorigenesis and development, and its molecular mechanism in osteosarcoma is unclear. In this study, by investigating osteosarcoma tissue and cells, we explored the molecular mechanism by which lncRNA DANCR regulates the occurrence and development of osteosarcoma by targeting the miR-149 / MSI2 axis. PATIENTS AND METHODS In this study, osteosarcoma tissues and adjacent tissues in 109 patients were collected, and the relative expression of DANCR was detected by qPCR. The correlation between DANCR expression and clinical classification was statistically analyzed. In order to explore the potential molecular mechanism of DANCR related to tumor migration and invasion, an overexpression and silencing test was performed on the osteosarcoma cell line Saos-2, and then qPCR method was used to test the expression of miR149, and cell scratch test was used to detect invasion after DANCR silencing and miR149 overexpression. Transwell assay was used to detect the invasion after DANCR silencing and miR149 overexpression. Finally, Western blot was used to verify the expression of MSI2 protein after overexpression and silencing of miR-149. RESULTS DANCR was significantly up-regulated in both osteosarcoma tissue and cells. The high expression of DANCR was significantly positively correlated with tissue typing and advanced TNM stage. DANCR can significantly reduce the migration and invasion of osteosarcoma cells. miRNA overexpression significantly reduced osteosarcoma cell migration and invasion. When miR-149 was overexpressed, MSI2 protein expression was significantly down-regulated. When miR-149 was silenced, MSI2 protein was significantly up-regulated. CONCLUSIONS LncRNA DANCR plays an important regulatory role in the occurrence and development of osteosarcoma. It may be used as a potential target in the treatment of osteosarcoma in the future, by targeting the miR-149/MSI2 axis to regulate the occurrence and development of osteosarcoma.