Objective:The aim of this study was to investigate the synergistic effects of oxaliplatin and teniposide on proliferation and apoptosis of gastric cancer cell line BGC-823.Methods:MTT assay was carried to examine the ...Objective:The aim of this study was to investigate the synergistic effects of oxaliplatin and teniposide on proliferation and apoptosis of gastric cancer cell line BGC-823.Methods:MTT assay was carried to examine the inhibition rate of oxaliplatin and teniposide on gastric cancer cell line BGC-823 with various concentrations separately and associatively.The apoptosis rate of BGC-823 cells under the treatment of oxaliplatin or/and teniposide was examined by flow cytometry.The expression level of livin, an apoptosis-associated protein, was explored by western blot.Results:Oxaliplatin or teniposide could remarkably inhibit the BGC-823 gastric cancer cell growth with a dose-response manner, separately and associatively.The inhibition rate of oxaliplatin combined with teniposide on BGC-823 cells was higher than that of single oxaliplatin or single teniposide(P < 0.05), with 0.46 as combination index(CI) value.The apoptosis rates of cells treated by oxaliplatin for 12 h, 24 h and 48 h were 6.13%, 13.86% and 21.48%, respectively, while which of teniposide were 4.60%, 10.72%, 17.07%.But when the two medicines were carried associatively, the apoptosis rates for 12 h, 24 h and 48 h were 11.73%, 24.14% and 44.75%, respectively.Western blot showed that the expression level of livin was more down-regulated when cells were treated by oxaliplatin + teniposide than by oxaliplatin singly.Conclusion:The combination of oxaliplatin and teniposide can exert a synergistic effect on gastric cancer cell BGC-823.展开更多
Objective: To determine the effects on the cell growth, tumorigenicity and chemosensitivity of p16/CDK4I in human glioma. Methods: p16 gene was transfected into U251 cells by lipofectin. Expression of exogenous p16 ge...Objective: To determine the effects on the cell growth, tumorigenicity and chemosensitivity of p16/CDK4I in human glioma. Methods: p16 gene was transfected into U251 cells by lipofectin. Expression of exogenous p16 gene was confirmed by immunohistochemistry and Northern blot. The effects of exogenous p16 gene on the growth and chemosensitivity to teniposide were examined. Results: Expression of exogenous p16 gene inhibited the growth dramatically in vitro. G1 arrest of tumor cells was observed. However, wt p16-positive U251 was less sensitive than control cell lines and the number of apoptotic cells after chemotherapy was reduced. Conclusion: The expression of exogenous p16 gene could inhibit the growth of glioma. On the other hand, the chemosensitivity to teniposide of p16-positive U251 was decreased.展开更多
文摘Objective:The aim of this study was to investigate the synergistic effects of oxaliplatin and teniposide on proliferation and apoptosis of gastric cancer cell line BGC-823.Methods:MTT assay was carried to examine the inhibition rate of oxaliplatin and teniposide on gastric cancer cell line BGC-823 with various concentrations separately and associatively.The apoptosis rate of BGC-823 cells under the treatment of oxaliplatin or/and teniposide was examined by flow cytometry.The expression level of livin, an apoptosis-associated protein, was explored by western blot.Results:Oxaliplatin or teniposide could remarkably inhibit the BGC-823 gastric cancer cell growth with a dose-response manner, separately and associatively.The inhibition rate of oxaliplatin combined with teniposide on BGC-823 cells was higher than that of single oxaliplatin or single teniposide(P < 0.05), with 0.46 as combination index(CI) value.The apoptosis rates of cells treated by oxaliplatin for 12 h, 24 h and 48 h were 6.13%, 13.86% and 21.48%, respectively, while which of teniposide were 4.60%, 10.72%, 17.07%.But when the two medicines were carried associatively, the apoptosis rates for 12 h, 24 h and 48 h were 11.73%, 24.14% and 44.75%, respectively.Western blot showed that the expression level of livin was more down-regulated when cells were treated by oxaliplatin + teniposide than by oxaliplatin singly.Conclusion:The combination of oxaliplatin and teniposide can exert a synergistic effect on gastric cancer cell BGC-823.
基金the National Natural Science Foundation of China! (No. 39700143).
文摘Objective: To determine the effects on the cell growth, tumorigenicity and chemosensitivity of p16/CDK4I in human glioma. Methods: p16 gene was transfected into U251 cells by lipofectin. Expression of exogenous p16 gene was confirmed by immunohistochemistry and Northern blot. The effects of exogenous p16 gene on the growth and chemosensitivity to teniposide were examined. Results: Expression of exogenous p16 gene inhibited the growth dramatically in vitro. G1 arrest of tumor cells was observed. However, wt p16-positive U251 was less sensitive than control cell lines and the number of apoptotic cells after chemotherapy was reduced. Conclusion: The expression of exogenous p16 gene could inhibit the growth of glioma. On the other hand, the chemosensitivity to teniposide of p16-positive U251 was decreased.
