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OBJECTIVES To further investigate the effects of miR-497 on the biological behavior of human medulloblastoma cell line in vitro. METHODS Human medulloblastoma cell lines, Daoy and D341, were used in this study, and the miR-497 expression in the cells was measured by Quantitative PCR with fluorescence. The Daoy cells were divided into the mimics group (Daoy cells treated with mimics), inhibitor group (Daoy cells treated with inhibitor), normal Daoy cells, ARHGDIA siRNA group (Daoy cells transfected with ARHGDIA siRNA), ARHGDIA control group (Daoy cells did not receive any treatment), and negative control group (normal cells transfected with ARHGDIA siRNA). The expression of miR-497 and ARHGDIA mRNA was measured by Quantitative PCR with fluorescence, while the level of ARHGDIA protein was measured by Western blot. The binding capability of ARHGDIA and miR-497 was assessed by luciferase assay, the migration of cells was assessed by wound healing assay, and the invasion of cells was assessed by Transwell assay. RESULTS Compared to D341 cells, the miR-497 level was significantly higher in the Daoy cells (P<0.01). The dual-luciferase reporter assay showed that miR-497 targets ARHGDIA. Transfecting the normal Daoy cells with miR-497 mimics significantly reduced the expression of ARHGDIA protein (P<0.05), while transfecting normal Daoy cells with miR-497 inhibitor significantly increased the expression of ARHGDIA protein (P<0.05). Consequently, the migration and invasion capability of cells increased significantly after transfection with miR-497 mimic (P<0.05), and decreased significantly after transfection with miR-497 inhibitor (P<0.05). In addition, the migration and invasion capabilities of the cells also increased significantly after transfection with ARHGDIA siRNA (P<0.05). CONCLUSIONS miR-497/ARHGDIA axis participates in the in vitro migration and invasion of human medulloblastoma cell lines.