Expression of COX-1, COX-2 and PGE
in lung cancer cell lines. (A). Expression of COX-1 and COX-2 by a panel of lung cancer cell lines was determined by Western blotting. 30 μg of total protein was loaded from each sample. These results are representative of three independent experiments (B). PGE2 production was measured in 48 h conditioned medium by competitive ELISA. Each bar is the mean ± SEM of three determinations.