West Asia Organization for Cancer Prevention (WAOCP), APOCP's West Asia Chapter. Asian Pacific Journal of Cancer Prevention 1513-7368 13 12 2012 12 01 RNAi-induced K-Ras Gene Silencing Suppresses Growth of EC9706 Cells and Enhances Chemotherapy Sensitivity of Esophageal Cancer 6517 6521 27266 EN Journal Article 1970 01 01 To analyze the growth, proliferation, apoptosis, invasiveness and chemotherapy sensitivity of EC9706 cellsafter K-Ras gene silencing, an expression carrier pSilencer-siK-Ras was constructed, and the EC9706 cell linewas transfected using a liposome technique. Six groups were established: Control, siRNA NC (transfected withempty vector pSilencer2.1); Ras siRNA (transfected with pSilencer-siK-Ras2); Paclitaxel; Paclitaxel + siRNANC; and Ras siRNA + Paclitaxel. After the treatment, RT-PCR, Western blotting, MTT assay, flow cytometryand the Transwell technique were used to assess expression of K-Ras mRNA and protein in EC9706 cells, aswell as cell growth, proliferation, apoptosis and invasiveness. The effect of Paclitaxel chemotherapy was alsotested. pSilencer-siK-Ras2 effectively down-regulated expression of K-Ras mRNA and protein in EC9706 cells,growth being significantly inhibited. Flow cytometry indicated obvious apoptosis of cells in the experimentalgroup, with arrest in the G1 phase; cell migration ability was also reduced. After pSilencer-siK-Ras2 transfectionor the addition of Paclitaxel, EC9706 cells were suppressed to different extents; the suppressive effect wasstrengthened by combined treatment. The results suggested that RNAi-induced K-Ras gene silencing couldenhance chemotherapy sensitivity of esophageal cancer. https://journal.waocp.org/article_27266_64e6d65c7a205ff30419497e4e88c8c3.pdf