Small interference of transcription factor Snail contribute to enhanced cisplatin sensitivity on human laryngeal resistant cancer cells

: Objective:To study the relationship between transcription factor Snail and the sensitivity of cisplatin on human laryngeal resistant cancer cells.Method:siRNA interference of Snail was transfected by small RNA interference technology. The interference efficiency on mRNA level were detected by RT-qPCR assay; the expression of Snail protein level was assessed by immunofluorescence. The inhibition ratio of different cisplatin concentration (0, 1, 2, 4, 8, 16 μg/ml) was detected by CCK-8 assay; the protein level of Snail, E-cadherin, MDR1were detected by Western blot assay.Result:RT-qPCR assay show the expression of Snail on mRNA level was decreased to (67.85±9.50)% after transfection in Hep-2/CDDP cell(P<0.05). Immunofluorescence show fluorescence intensity of si-Hep-2/CDDP group was reduced both in nucleus and cytoplasm; CCK-8 assay show the inhibitory ratio of transfected group was increased compared to negative control and Hep-2/CDDP group in different cisplatin concentration (0, 1, 2, 4, 8, 16 μg/ml) (P<0.05). Western blot assay show the protein expression of Snail and MDR1 were down-regulated in transfected Hep-2/CDDP cells (allP<0.05), while epithelial marker E-cadherin was up-regulated in protein level (P<0.05).Conclusion:Small interference of transcription factor Snail could increase the expression of E-cadherin while decrease the expression of MDR1, and it was confirmed that interference Snail contribute to enhanced cisplatin sensitivity on human laryngeal resistant cancer cells.