Downregulation of miRNA-214 inhibits cisplatin resistance, cell migration, and epithelial interstitial transformation in gastric cancer SGC-7901/DDP cells

BACKGROUND

Gastric cancer (GC) is one of the common tumors of the digestive system, and resistance to chemotherapy is the bottleneck that restricts the therapeutic effect of chemotherapy in GC. Therefore, it is of great significance to explore the mechanism of reversal of chemotherapy resistance.

AIM

To investigate the effect of miRNA-214 (miR-214) knockdown on cisplatin resistance, cell migration, and epithelial mesenchymal transformation (EMT) in GC SGC-7901/DDP cells, and to explore the preliminary mechanism.

METHODS

After transfection of SGC-7901/DDP cells with miR-214 inhibitor using the Lipofectamine^TM2000 method, the change of cell resistance to cisplatin was evaluated by the CCK-8 assay, cell migration was evaluated by wound healing assay, and the protein expression levels of E-cadherin (E-cad), Vimentin, N-cadherin (N-cad), NF-κB, and Bcl-2 were detected by Western blot.

RESULTS

After transfection with miR-214 inhibitor, the resistance of SGC-7901/DDP cells to cisplatin was significantly reduced (P < 0.05), and the ability of cell migration was obviously decreased (P < 0.05). The expression level of E-cad protein was significantly increased (P < 0.05), while the expression levels of Vimentin and N-cad proteins were significantly decreased (P < 0.05). Moreover, the expression levels of NF-κB and Bcl-2 protein in SGC-7901/DDP cells were significantly decreased (P < 0.05).

CONCLUSION

Down-regulation of miR-214 can reduce the resistance of SGC-7901/DDP cells to cisplatin and inhibit cell migration and EMT. This effect may be related to the down-regulation of NF-κB and Bcl-2 expression.