Objective:To evaluate the effect and possible mechanism of B-cell-specific moloney murine leukemia virus insertion site 1(BMI-1) on the radiosensitivity of pancreatic cancer SW1990 cell line.Methods:According to our previous study results, 4 Gy X-ray and down-regulation of BMI-1 expression were adopted as intervention conditions. The effect on the proliferation of SW1990 cells was assessed by clony formation assay. The effect on cell apoptosis and cell cycle was evaluated by flow cytometry. The effect upon the epithelial-mesenchymal transition (EMT) was determined by Western blot.Results:Clony formation assay and flow cytometry found that the lowest cell proliferation ability and the highest apoptotic rate were obtained after BMI-1 down-regulation and 4 Gy X-ray compared with other groups (all P<0.05). Flow cytometry revealed that the proportion of G 0/G 1 phase was significantly decreased, whereas the G 2/M phase was remarkably increased in pancreatic cancer stem cells treated with 4 Gy X-ray compared with the control group (both P<0.05). Nevertheless, opposite results were obtained after down-regulation of BMI-1 expression. Western blot showed that the expression of E-cadherin was up-regulated, whereas that of Vimentin was down-regulated following 4 Gy X-ray (both P<0.05). Conclusion:Downregulation of BMI-1 expression can enhance the radiosensitivity of pancreatic cancer SW1990 cells, and its mechanism may be related to cell cycle and EMT.

【Objective】 To investigate the effect of lentinan on Sorafenib resistance in hepatocellular carcinoma (HCC) cells BEL-7402/S and its mechanism. 【Methods】 CCK-8 method was used to detect the proliferation-toxicity of lentinan and Sorafenib on BEL-7402 and BEL-7402/S cells, and the drug resistance reversal multiple of Sorafenib. The effects of lentinan on mRNA and protein expressions of vascular endothelial growth factor (VEGF) and hypoxia-inducible factor (HIF-1α) in BEL-7402/S cells were determined by RT-qPCR and Western blotting. 【Results】 Lentinan reduced the proliferation of BEL-7402 and BEL-7402/S cells. Lentinan showed at least a partial reversal of drug resistance to sorafenib in BEL-7402/S cells and down-regulated the mRNA and protein expressions of VEGF and HIF-1α in BEL-7402/S cells. 【Conclusion】 Lentinan can partially reverse the effect of BEL-7402/S cells on Sorafenib resistance, and the mechanism may be related to the down-regulation of VEGF and HIF-1α expressions.