The anti-tumor activity of curcumin against androgen-independent prostate cancer cells in vitro and the possible mechanism were investigated.After curcumin treatment,the effect of curcumin on the proliferation of pros...The anti-tumor activity of curcumin against androgen-independent prostate cancer cells in vitro and the possible mechanism were investigated.After curcumin treatment,the effect of curcumin on the proliferation of prostate cancer PC-3 cells was assessed by CFSE staining.Flow cytometery(FCM) was performed to analyze the cell cycle and the induction of apoptosis of tumor cells.A luciferase reporter gene assay was used to determine the effects of curcumin on the activities of intracellular NF-κB and AP-1 signaling pathways.The results showed curcumin could effectively inhibit the proliferation of PC-3 cells in vitro(P0.05).Cells were arrested at G2/M phase.After curcumin treatment,the percentage of apoptotic cells was significantly higher than in control group(P0.05).The results of the luciferase assay revealed that curcumin selectively inhibited the activities of the NF-κB and AP-1 signaling pathways in PC-3 cells significantly.It was suggested that curcumin could exert anti-tumor activity against androgen-independent prostate cancer cells in vitro by inhibiting cellular proliferation and inducing apoptosis,which was probably contributed to the inhibition of transcription factors NF-κB and AP-1.展开更多
Objective: The aim of this study was to investigate whether astrecyte elevated gene 1 (AEG1) regulates COX-2 expression in human hepatoma HepG2 cells and related pathways involved in this process. Methods: Human h...Objective: The aim of this study was to investigate whether astrecyte elevated gene 1 (AEG1) regulates COX-2 expression in human hepatoma HepG2 cells and related pathways involved in this process. Methods: Human hepatoma HepG2 cells were transfected with pcDNA3.1(-)-AEG1 plasmid or psilencer2.0-AEGl-shRNA1 plasmid to up/down-regulate AEG1 expression, pcDNA3.1(-) and psilencer 2.0 empty vector plasmids were transfected respectively as control. Real-time RT-PCR was carried out to measure the expression levels of AEG1 and COX-2 mRNA. The expression levels of AEG1 and COX-2 protein were detected by Western blot. NF-KB signaling was blocked by PDTC, and AP-1 signaling was blocked by curcumin. Results: AEG1 mRNA and protein levels were increased after pcDNA3.1(-)-AEG1 transfection, and decreased after psilencer2.0-AEGl-shRNAs transfection. COX-2 mRNA and protein levels were increased in AEGl-overexpressing cells and decreased in AEGl-knockdown cells. Phosphorylations of p65 and c-jun were up-regulated in AEGl-overexpressing cells. Both PDTC and curoumin reduced COX-2 expression in HepG2 cells with AEG1 overexpression. Conclusion: AEG1- overexpressing and -knockdown HepG2 cells are established successfully. AEG1 could induce COX-2 expression though activating NF-KB and AP-1 in human hepatoma HepG2 cells.展开更多
基金supported by a grant from the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20090142120096)
文摘The anti-tumor activity of curcumin against androgen-independent prostate cancer cells in vitro and the possible mechanism were investigated.After curcumin treatment,the effect of curcumin on the proliferation of prostate cancer PC-3 cells was assessed by CFSE staining.Flow cytometery(FCM) was performed to analyze the cell cycle and the induction of apoptosis of tumor cells.A luciferase reporter gene assay was used to determine the effects of curcumin on the activities of intracellular NF-κB and AP-1 signaling pathways.The results showed curcumin could effectively inhibit the proliferation of PC-3 cells in vitro(P0.05).Cells were arrested at G2/M phase.After curcumin treatment,the percentage of apoptotic cells was significantly higher than in control group(P0.05).The results of the luciferase assay revealed that curcumin selectively inhibited the activities of the NF-κB and AP-1 signaling pathways in PC-3 cells significantly.It was suggested that curcumin could exert anti-tumor activity against androgen-independent prostate cancer cells in vitro by inhibiting cellular proliferation and inducing apoptosis,which was probably contributed to the inhibition of transcription factors NF-κB and AP-1.
基金Supported by grants from the National Science Foundation of China (No.81070333)the Natural Science Foundation of Hubei Province of China (No.2012FFB02318)
文摘Objective: The aim of this study was to investigate whether astrecyte elevated gene 1 (AEG1) regulates COX-2 expression in human hepatoma HepG2 cells and related pathways involved in this process. Methods: Human hepatoma HepG2 cells were transfected with pcDNA3.1(-)-AEG1 plasmid or psilencer2.0-AEGl-shRNA1 plasmid to up/down-regulate AEG1 expression, pcDNA3.1(-) and psilencer 2.0 empty vector plasmids were transfected respectively as control. Real-time RT-PCR was carried out to measure the expression levels of AEG1 and COX-2 mRNA. The expression levels of AEG1 and COX-2 protein were detected by Western blot. NF-KB signaling was blocked by PDTC, and AP-1 signaling was blocked by curcumin. Results: AEG1 mRNA and protein levels were increased after pcDNA3.1(-)-AEG1 transfection, and decreased after psilencer2.0-AEGl-shRNAs transfection. COX-2 mRNA and protein levels were increased in AEGl-overexpressing cells and decreased in AEGl-knockdown cells. Phosphorylations of p65 and c-jun were up-regulated in AEGl-overexpressing cells. Both PDTC and curoumin reduced COX-2 expression in HepG2 cells with AEG1 overexpression. Conclusion: AEG1- overexpressing and -knockdown HepG2 cells are established successfully. AEG1 could induce COX-2 expression though activating NF-KB and AP-1 in human hepatoma HepG2 cells.