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Lazaroid U-74389F attenuates phorbol ester-induced lung injury in rabbits

M Miniati, F Cocci, S Monti, E Filippi, R Sarnelli, M Ferdeghini, V Gattai, M Pistolesi
European Respiratory Journal 1996 9: 758-764; DOI:
M Miniati
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F Cocci
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S Monti
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E Filippi
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R Sarnelli
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M Ferdeghini
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V Gattai
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M Pistolesi
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Abstract

We examined the effect of the antioxidant lazaroid U-74389F on acute lung injury induced in rabbits by phorbol myristate acetate (PMA). Thirty minutes after receiving either U-74389F (15 mg.kg-1 i.v.) or U-74389F vehicle, rabbits (n = 60) were given PMA (60 micrograms.kg-1 i.v.). PMA vehicle injected rabbits (n = 20) served as controls. Over a 5 h period after PMA or PMA vehicle injection, we measured arterial pH, arterial oxygen tension (Pa,O2), arterial carbon dioxide tension (Pa,CO2), and the plasma concentration of the neutrophil chemoattractant interleukin-8 (IL-8). At postmortem, lungs were inspected for macroscopic injury and examined histologically. Malondialdehyde levels were assayed in lung tissue as an index of lipid peroxidation. In bronchoalveolar lavage (BAL), total and differential cell counts, protein and IL-8 concentrations were measured. Compared to normal controls, rabbits challenged with PMA alone developed arterial acidosis, hypercapnia and hypoxaemia, accompanied by significant rise in plasma IL-8 concentration. U-74389F pretreated animals did not develop significant arterial blood gas abnormalities and had significantly lower IL-8 concentration in plasma. U-74389F did not prevent PMA-induced lipid peroxidation. However, macroscopic signs of lung injury and the degree of alveolar haemorrhage and protein extravasation were significantly less severe in pretreated rabbits than in those given PMA alone. In addition, U-74389F significantly reduced IL-8 concentration and neutrophil number in BAL. By histological assessment, 80% of lung neutrophils were localized in alveolar spaces of animals receiving PMA alone. Conversely, in U-74389F pretreated animals, 75% of neutrophils were distributed within extra-alveolar blood vessels and alveolar septa. We conclude that lazaroid U-74389F attenuates lung injury in rabbits given PMA by preventing neutrophil migration into pulmonary alveoli. This effect may, in part, be related to downregulation of IL-8 production.

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Lazaroid U-74389F attenuates phorbol ester-induced lung injury in rabbits
M Miniati, F Cocci, S Monti, E Filippi, R Sarnelli, M Ferdeghini, V Gattai, M Pistolesi
European Respiratory Journal Apr 1996, 9 (4) 758-764;

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Lazaroid U-74389F attenuates phorbol ester-induced lung injury in rabbits
M Miniati, F Cocci, S Monti, E Filippi, R Sarnelli, M Ferdeghini, V Gattai, M Pistolesi
European Respiratory Journal Apr 1996, 9 (4) 758-764;
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