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Reversibility of lung inflammation caused by SP-B deficiency. | LitMetric

Reversibility of lung inflammation caused by SP-B deficiency.

Am J Physiol Lung Cell Mol Physiol

Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA.

Published: December 2005

AI Article Synopsis

Article Abstract

Whereas decreased concentrations of surfactant protein (SP)-B are associated with lung injury and respiratory distress, potential causal relationships between SP-B deficiency and lung inflammation remain unclear. A transgenic mouse in which human SP-B expression was placed under conditional control of doxycycline via the CCSP promoter was utilized to determine the role of SP-B in the initiation of pulmonary inflammation. Adult mice, made SP-B deficient by removal of doxycycline, developed severe respiratory failure within 4 days. Deficiency of SP-B was associated with increased minimal surface tension of the surfactant and perturbed lung mechanics. Four days of SP-B deficiency did not alter SP-C content or surfactant phospholipid content or composition. SP-B deficiency was associated with lung inflammation and increased soluble L-selectin, STAT-3, and phosphorylated STAT-3 in alveolar macrophages and alveolar epithelial cells. Alveolar IL-6, IL-1beta, and macrophage inflammatory protein-2 concentrations were increased after removal of doxycycline, indicating pulmonary inflammation. Restoration of SP-B expression following administration of doxycycline rapidly reversed SP-B-dependent abnormalities in lung mechanics and inflammation. SP-B deficiency is sufficient to cause lung dysfunction and inflammation in adult mice. SP-B reversed inflammation and maintained lung function in vivo, indicating its potential utility for the prevention and treatment of pulmonary injury and surfactant deficiency.

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Source
http://dx.doi.org/10.1152/ajplung.00214.2005DOI Listing

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