Fig. 7From: Aspirin-Triggered Lipoxins (15-epi-LX) Are Generated by the Human Lung Adenocarcinoma Cell Line (A549)–Neutrophil Interactions and Are Potent Inhibitors of Cell Proliferation Lipoxin inhibits cell proliferation (A) DNA synthesis. A549 cells were grown for 72 hr in the presence of test compounds (5–500 nM). Twenty-four hours before the assay, methyl-[3H]-thymidine (2 µCi/ml) was added to each well. Cells were subsequently washed four times with DPBS2+ (4°C), lysed with 0.25 N NaOH, and radioactivity incorporation was monitored. Values represent mean ± SEM of three different experiments performed in quadruplicate. Results are expressed as the percentage of [3H]-thymidine incorporation relative to vehicle alone. *p < 0.05 and **p < 0.005 for compounds versus vehicle. (B) Direct cell count. A549 cells were seeded in 12-well culture plates in the presence of compounds (1 µM) and cell counts were obtained at 72 hr by enumerating the trypan-blue excluding cells. Values represent mean ± SEM of three different experiments. Results are expressed as the percentage inhibition of proliferation relative to buffer. *p < 0.05 for compounds versus vehicle.Back to article page