Ibuprofen attenuates hypochlorous acid production from neutrophils in porcine acute lung injury

Abstract Hypochlorous acid (HOCI), a neutrophil-generated oxidant, has been implicated in tissue destruction in sepsis induced acute lung injury (ALI). Ibuprofen, a cyclooxygenase inhibitor, successfully attenuates many of the physiological derangements in ALI. The aim of this study was to examine the role of PMN hypochlorous acid in sepsis-induced ALI and evaluate the effect of ibuprofen therapy. Neutrophils from three groups of young (15–25 kg), anesthetized swine were studied: controls ( C , n = 7) received 0.9% NaCl, septic animals ( Ps , n = 8) received live Pseudomonas aeruginosa (5 × 10 8 CFU/ml at 0.3 ml/20 kg/min) for 60 min, and ibuprofen-treated animals (Ps + I , n = 6) received Ps plus ibuprofen 12.5 mg/kg administered at 0 and 120 min. Neutrophils were isolated from peripheral blood at 0, 60, and 300 min and the rate and total production of HOCl were assessed on the basis of the ability of the amino acid taurine to trap HOCl. Results: Septic (Ps) PMNs produce 32% more HOCl, P t = 0 vs 16.03 ± 2.6 ml/kg, t = 300, P t = 0 vs 633 ± 104 μg/ml, t = 300, P P P