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B Activation and Neutrophil Recruitment Require IL-1 and TNF Receptor Signaling during Pneumococcal Pneumonia1
Physiology Program, Harvard School of Public Health, Boston, MA 02115
Pulmonary inflammation is an essential component of the host defense against Streptococcus pneumoniae infection of the lungs. The early response cytokines, TNF-
and IL-1, are rapidly induced upon microbial exposure. Mice deficient in all TNF- and IL-1-dependent signaling receptors were used to determine the roles of these cytokines during pneumococcal pneumonia. The deficiency of signaling receptors for TNF and IL-1 decreased bacterial clearance. Neutrophil recruitment to alveolar air spaces was impaired by receptor deficiency, as was pulmonary expression of the neutrophil chemokines KC and MIP-2. Because NF-
B mediates the expression of both chemokines, we assessed NF-B activation in the lungs. During pneumococcal pneumonia, NF-B proteins translocate to the nucleus and activate gene expression; these functions were largely abrogated by the deficiency of receptors for TNF- and IL-1. Thus, the combined deficiency of TNF and IL-1 signaling reduces innate immune responses to S. pneumoniae in the lungs, probably due to essential roles for these receptors in activating NF-B.
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