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pubmed-article:10484466pubmed:abstractTextSurfactant protein A (SP-A) is a member of the collectin family of host defense molecules expressed primarily in the epithelial cells of the lung. To determine the role of SP-A in pulmonary adenoviral infection, SP-A-deficient (SP-A -/-) mice were intratracheally infected with a replication-deficient recombinant adenovirus, Av1Luc1. Lung inflammation was markedly increased in SP-A -/- compared with SP-A +/+ mice and was associated with increased hemorrhage and epithelial cell injury. Polymorphonuclear cells in bronchoalveolar lavage fluid (BALF) were increased in SP-A -/- mice after administration of adenovirus. Coadministration of adenovirus and purified human SP-A ameliorated adenoviral-induced lung inflammation in SP-A -/- mice. Concentrations of tumor necrosis factor-alpha (TNF-alpha), interleukin (IL)-6, and IL-1beta were increased in BALF of SP-A -/- mice. Likewise, TNF-alpha, IL-6, macrophage inflammatory protein (MIP)-1alpha, monocyte chemotactic protein-1, and MIP-2 mRNAs were increased in lung homogenates from SP-A -/- mice 6 and 24 h after viral administration. Clearance of adenoviral DNA from the lung and uptake of fluorescent-labeled adenovirus by alveolar macrophages were decreased in SP-A -/- mice. SP-A enhances viral clearance and inhibits lung inflammation during pulmonary adenoviral infection, providing support for the importance of SP-A in antiviral host defense.lld:pubmed
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pubmed-article:10484466pubmed:articleTitleSP-A enhances viral clearance and inhibits inflammation after pulmonary adenoviral infection.lld:pubmed
pubmed-article:10484466pubmed:affiliationChildren's Hospital Medical Center, Division of Neonatology and Pulmonary Biology, Cincinnati, Ohio 45229, USA.lld:pubmed
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