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Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039
Clara cell secretory protein
(CCSP) is a 16-kDa homodimeric polypeptide secreted by respiratory
epithelial cells in the conducting airways of the lung. To assess the
role of CCSP in bacterial inflammation and to discern whether CCSP
expression is influenced by bacterial infection, CCSP-deficient
[(
/
)] gene-targeted mice and wild-type mice were given
Pseudomonas aeruginosa intratracheally. Infiltration by
polymorphonuclear cells was significantly increased in the lungs of
CCSP(
/
) mice 6 and 24 h after the administration of the
bacteria. The number of viable bacteria isolated from the lungs in
CCSP(
/
) mice was decreased compared with that in wild-type mice.
Concentrations of the proinflammatory cytokines interleukin-1
and
tumor necrosis factor-
were modestly increased after 6 and 24 h, respectively, in CCSP(
/
) mice. The concentration of CCSP protein
in lung homogenates decreased for 1-5 days after infection and
recovered by 14 days after infection. Likewise, CCSP mRNA and
immunostaining for CCSP markedly decreased in respiratory epithelial
cells after infection. CCSP deficiency was associated with enhanced
pulmonary inflammation and improved killing of bacteria after acute
pulmonary infection with P. aeruginosa. The finding that
Pseudomonas infection inhibited CCSP expression provides further support for the concept that CCSP plays a role in the modulation of pulmonary inflammation during infection and recovery.
Clara cell secretory protein; mucosal immunity; bacterial infection
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