الملخص
Objective:To investigate the relationship between LncRNA MALAT-1 and miR-205 in non-small cell lung cancer and the mechanism of biological behavior in lung cancer cells.Methods: The expression of LncRNA MALAT-1 in different non-small cell lung cancer was detected by qPCR.The interaction between MALAT-1 and miR-205 was detected by double luciferase reporter gene.Transwell invasion assay and scratch test were used to detect the changes of invasion and migration abilities of lung cancer cells after silencing MALAT-1 and the recovery the abilities after inhibition of miR-205 expression.The tumor volume and quality of lung cancer cells were detected by subcutaneous tumor formation in nude mice after silencing MALAT-1.Results:Compared with other lung cancer cell lines,the expression of MALAT-1 was the highest and the expression level of miR-205 was the lowest in A549 cells.The double luciferase assay confirmed that MALAT-1 could specifically bind to 3′UTR of miR-205,and could regulate the expression and activity of miR-205.Inhibition of MALAT-1 expression could reduce the migration and invasion of lung cancer cells;while inhibiting the expression of miR-205 level,the migration and invasion of lung cancer cells could recovery.The tumor volume and quality of lung cancer cells were reduced after silencing MALAT-1 in subcutaneous tumorigenesis of nude mice.Conclusion: MALAT-1 can regulate the expression of miR-205 and affect the invasion and migration of lung cancer cell line A549.