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Journal Article
Research Support, Non-U.S. Gov't
Improved host defense against pneumococcal pneumonia in platelet-activating factor receptor-deficient mice.
Journal of Infectious Diseases 2004 Februrary 16
Platelet-activating factor (PAF) is a phospholipid with proinflammatory properties that binds to a specific receptor (PAF receptor [PAFR]) that is expressed on many different cell types. PAFR is able to bind phosphorylcholine, which is present in both PAF and the pneumococcal cell wall. Activation of respiratory epithelial cells in vitro results in up-regulation of PAFR, which, in turn, facilitates invasion of Streptococcus pneumoniae. To determine the role of PAFR in host defense against pneumococcal pneumonia, PAFR-deficient (PAFR(-/-)) and wild-type (wt) mice were inoculated intranasally with S. pneumoniae. PAFR(-/-) mice were relatively resistant to pneumococcal pneumonia, as indicated by delayed and reduced mortality, diminished outgrowth of pneumococci in lungs, and reduced dissemination of the infection (all P<.05, vs. wt mice). PAFR(-/-) mice also had less pulmonary inflammation. These data provide evidence that PAFR is used by S. pneumoniae to induce lethal pneumonia.
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