Pulmonary EC transfected with non-specific or FPR1, FPR2/ALX, or FPR3 specific siRNAs were treated with thrombin (0.5 U/ml), with or without OxPAPC pretreatment (15 μg/ml, 30 min). A - Analysis of EC permeability for macromolecules using FITC-labeled avidin as a tracer; n=6, *P < 0.01 vs. thrombin alone. B - MLC di-phosphorylation was evaluated using phospho-MLC specific antibody in control, thrombin, or OxPAPC treated EC. C - Effects of OxPAPC and LXA4 (100 nM) on thrombin-induced MLC phosphorylation were evaluated by Western blotting. Probing for β-tubulin was used as a normalization control. Numerical data depict results of quantitative densitometry; n=4; p<0.05 vs. thrombin alone.