ABSTRACT
Aim To investigate the possible mechanism of antitumor in human lung cancer cell lines A549 and NCI-H460 induced by lumiracoxib.Methods The expression of COX-2 was detected by Western blot and the levels of PGE2 and cAMP was determined by radioimmunoassay (RIA).Results COX-2 protein was highly expressed in A549 and NCI-H460 cells.After treatment with 15~240 ?mol?L-1 LUM for 24 hrs,LUM significantly decreased the level of COX-2 in A549 cells,but not in NCI-H460 cells.Compared with the control,the PGE2 production was reduced and the level of cAMP was increased after the treatment with 15,30,60,120,240 ?mol?L-1 of LUM,respectively.Conclusion The effect of Lumiracoxib on antitumor is in COX-2-dependent or-independent manner. The antitumor effect of LUM may be related to inhibiting the COX-2 activities by decreasing its secretion,up-regulating the level of cAMP,and down-regulating the level of PGE2.