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- W2053609448 abstract "The extracellular signal-regulated kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) pathway plays a critical role in the anticancer action in vitro. ERK1/2 activation or phosphorylation is responsible for increased cyclooxygenase-2 (COX-2) protein expression in some cancer cells treated with selective COX-2 inhibitor NS398. We determined the effect of NS398 on ERK signaling and the synergistic effect of combined treatment with NS398 and a specific MEK inhibitor U0126 on three human endometrial cancer cell lines: Ishikawa, HEC-1A and AN3CA cells. Results showed that NS398 and U0126 individually, and especially the combination of both exhibited profound anti-proliferation of all three cell lines in a time- and concentration-dependent manner by [3-(4, 5)-dimethylthiazol-z-yl]-2, 5-diphenyl tetrazolium bromide (MTT) assay. The phosphorylated ERK1/2 was up-regulated in HEC-1A and AN3CA cells, but the COX-2 protein expression was unchanged in the three cancer cell lines treated with NS398 alone. However, both phosphorylated ERK1/2 and COX-2 protein expression were concentration-dependently decreased in all three cell types by combined treatment with NS398 and U0126 assessed by western blot analysis. Simultaneously, the combination of NS398 and U0126 resulted in 2-fold increase in apoptosis of all three lines over that by the individual alone, and enhanced G0/G1 phase arrest of Ishikawa and HEC-1A cells induced by U0126 treatment determined by flow cytometry. The synergistic and complementary effects of combining NS398 and U0126 were found to be associated with activation of caspase-3, alterations of Bcl-2 family proteins and cell cycle regulatory proteins detected by western blot analysis. Taken together, these findings correlate with blocking MEK-ERK signaling cascade and down-regulating COX-2 protein expression in endometrial cancer cells with combination treatment of NS398 and U0126, suggesting that the combinatory use of NS398 and specific MEK inhibitors may be valuable for chemotherapy or chemoprevention of human endometrial cancer." @default.
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- W2053609448 date "2005-03-01" @default.
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- W2053609448 title "Significant anti-proliferation of human endometrial cancer cells by combined treatment with a selective COX-2 inhibitor NS398 and specific MEK inhibitor U0126" @default.
- W2053609448 doi "https://doi.org/10.3892/ijo.26.3.737" @default.
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