氯美昔布抗肺癌细胞增殖作用的机制探讨

目的探讨氯美昔布(lumiracoxib,LUM)抗肺癌作用的可能机制。方法采用Western blot法检测不同浓度的LUM作用于A549和NCI-H460细胞COX-2表达及放射免疫法(RIA)检测PGE2及cAMP水平。结果A549细胞中随着LUM浓度的增加,COX-2的表达水平逐渐下降。而NCI-H460细胞中不同剂量组间COX-2的表达水平并无明显的变化。不同浓度的LUM作用于A549和NCI-H460细胞后,发现PGE2的水平下降、cAMP的水平升高均呈剂量依赖性(P<0.01)。结论LUM在体外的抗肺癌细胞增殖作用机制可能涉及到COX-2依赖性和非依赖性两种途径,并通过PGE2的合成减少和cAMP的水平升高来实现的。

Mechanisms of lumiracoxib on antitumor in human lung cancer cells

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 μmol·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 μmol·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.