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Am J Physiol Lung Cell Mol Physiol 279: L1083-L1090, 2000;
1040-0605/00 $5.00
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Vol. 279, Issue 6, L1083-L1090, December 2000

Neutrophil recruitment and increased permeability during acute lung injury induced by lipopolysaccharide

M. Chignard and V. Balloy

Unité de Pharmacologie Cellulaire, Unité Institut National de la Santé et de la Recherche Médicale/Pasteur 485, Institut Pasteur, 75015 Paris, France

The intranasal administration of lipopolysaccharide (LPS) to mice triggers a huge influx of polymorphonuclear neutrophils (PMNs) into the airway spaces, with a peak at 48 h. The increase in protein concentration, an index of microvascular permeability, displayed a different pattern, i.e., a first increase with a plateau between 3 and 24 h followed by a second increase peaking at 72 h. When mice were depleted of circulating PMNs, the increase in protein concentration was inhibited at 3 h but not at 24 h. The lack of PMN involvement at 24 h was confirmed by 1) in situ activation of exudated PMNs present in the air spaces on intranasal administration of LPS and 2) induction of the migration of PMNs sequestered in lung vessels on intraperitoneal administration of LPS. These findings show that the increase in microvascular permeability during lung inflammation is due to at least two distinct mechanisms, an early one related to the neutrophil influx and a delayed one occurring even under neutropenic conditions.

mice; pulmonary inflammation; anti-granulocyte antibody; bronchoalveolar fluid


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