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- W2104772105 abstract "Surfactant protein (SP)-A is a member of the collectin family of proteins. In vitro, SP-A binds influenza A virus (IAV), neutralizes infectivity, and enhances uptake by macrophages. SP-D also binds and neutralizes certain strains of IAV. To determine if SP-A has a role in protecting the intact animal against IAV infection, we inoculated gene-targeted SP-A-deficient mice (-/-) and littermate controls (+/+) with either saline or increasing doses of an IAV strain that binds SP-A but not SP-D. IAV was more virulent in SP-A-/- compared with +/+ mice, with a significantly lower mean lethal dose (LD(50)) and significantly greater weight loss during infection. SP-A-/- mice also had increased airway epithelial injury and more alveolar cellular infiltrates than +/+ mice. On Day 2, SP-A-/- mice had more neutrophils and higher MIP-2 levels in the lung than +/+ mice. We conclude the altered host response and increased susceptibility to X-79Delta167 infection in SP-A-/- mice reflects a protective role for SP-A in regulating the host response to IAV. Because the recovery of virus from lung homogenates on Days 2 and 6 after inoculation was comparable in -/- and +/+ mice, we speculate SP-A reduces IAV virulence independently of direct viral neutralization." @default.
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- W2104772105 date "2002-03-01" @default.
- W2104772105 modified "2023-09-25" @default.
- W2104772105 title "Surfactant Protein-A–Deficient Mice Display an Exaggerated Early Inflammatory Response to a β -Resistant Strain of Influenza A Virus" @default.
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- W2104772105 doi "https://doi.org/10.1165/ajrcmb.26.3.4584" @default.
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