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Primary ovarian cancer is one of the predominant causes of mortality from gynecological cancer. The suppression of serine/threonine p21-activated kinases (PAKs), proteins involved in cell morphology and cytoskeletal reorganization, has been hypothesized to improve the survival of patients with ovarian cancer. However, the association between microRNA-126 (miR-126) and PAK4 in the inhibition of ovarian cancer cell invasion remains to be established. The present study demonstrated changes in the level of PAK4 expression in ovarian cancer SKOV3 cells with altered miR-126 compared with normal SKOV3 cells. The SKOV3 cells that were transfected with LV3-miR-126 to increase miR-126 expression exhibited significantly downregulated expression levels of PAK4 (P&lt;0.05), whilst transfection with the LV3-hsa-miR-126 inhibitor increased the expression of PAK4 in these cells (P&lt;0.05), as assessed by immunofluorescence staining. Furthermore, western blot analysis revealed a significant increase in PAK4 expression in the SKOV3 cells transfected with the LV3-hsa-miR-126 inhibitor, and a decrease in those transfected with LV3-hsa-miR-126. The present study provides an experimental foundation for miR-126 as a potential tumor suppressor that may decrease PAK4 expression to inhibit ovarian cancer cells.

microRNA-126 suppresses PAK4 expression in ovarian cancer SKOV3 cells