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. 1996 Apr;117(8):1792–1796. doi: 10.1111/j.1476-5381.1996.tb15356.x

Effect of cyclo-oxygenase inhibitors and modulators of cyclic AMP formation on lipopolysaccharide-induced neutrophil infiltration in mouse lung.

V L Goncalves de Moraes 1, B Boris Vargaftig 1, J Lefort 1, A Meager 1, M Chignard 1
PMCID: PMC1909558  PMID: 8732293

Abstract

1. The adult respiratory distress syndrome (ARDS) is an acute lung inflammation developed after direct or indirect contact with pathogenic agents. In the present study, a mouse model was developed to mimic this condition using aerosolized bacterial lipopolysaccharide (LPS) and to investigate the mechanisms involved in the lung inflammatory response. 2. Inhalation of LPS led to a time and dose-dependent increase in tumour necrosis factor-alpha (TNF-alpha) production and neutrophil recruitment into the bronchoalveolar lavage fluid (BALF) of Balb/c mice. Under the same conditions, neutrophil infiltration was also found in the BALF of the LPS-sensitive mouse strain C3H/HeN, but was absent in the LPS-resistant strain C3H/HeJ. Intranasal administration of murine recombinant TNF-alpha also triggered neutrophil recruitment. 3. One hour after inhalation of LPS, half of the maximal level of TNF-alpha was measured in the BALF, but only a few neutrophils were detected at this time. The peak TNF-alpha concentration was reached at 3 h, when the neutrophil amount started to increase. At 24 h, maximal neutrophil number was found in the BALF and TNF-alpha was no longer present. 4. Pretreatment of mice under different experimental conditions demonstrated that: (a) cycloheximide almost completely blocks both neutrophil recruitment and TNF-alpha production; (b) anti TNF-alpha antibodies block neutrophil recruitment; (c) indomethacin or aspirin enhance by two fold neutrophil recruitment; (d) indomethacin significantly increases TNF-alpha production 1 h after inhalation of LPS; (e) dibutyryl cyclic AMP and prostaglandin E2 (PGE2) block both neutrophil recruitment and TNF-alpha production. 5. It is concluded that aerosolized LPS in mice triggers an acute lung inflammation which can be used as a potential model of inhalational ARDS and that, strategies leading to the elevation of cyclic AMP levels in vivo can be effective in modulating LPS-induced TNF-alpha synthesis and neutrophil recruitment.

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Selected References

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