Clara cell secretory protein decreases lung inflammation after acute virus infection.
Clara cell secretory protein (CCSP) is an abundant 10-kDa polypeptide synthesized and secreted primarily by nonciliated bronchiolar epithelial cells in the mammalian lung. To determine the potential role of CCSP in pulmonary inflammation after acute viral infection, CCSP gene-targeted (CCSP-deficient [CCSP(-/-)]) mice were exposed to a recombinant E1- and E3-deficient adenoviral vector, Av1Luc1, intratracheally. Lung inflammation was markedly increased in CCSP(-/-) mice compared with wild-type control mice and was associated with an increased number of polymorphonuclear cell infiltrates and epithelial cell injury in both conducting airways and alveolar regions. Histological evidence of pulmonary inflammation in CCSP(-/-) mice was associated with increased production of cytokine (interleukin-1beta and -6 and tumor necrosis factor-alpha) mRNA and protein, as well as chemokine (macrophage inflammatory protein-1alpha and -2 and monocyte chemoattractant protein-1) mRNA expression within the lung in response to adenoviral infection. Adenoviral-mediated gene transfer was decreased in CCSP(-/-) mice relative to wild-type mice as measured by luciferase enzyme activity in lung homogenates. The present study suggests that CCSP is involved in modulating lung inflammation during viral infection and supports a role for CCSP in lung host defense.
Harrod
K S
KS
Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA.
Mounday
A D
AD
Stripp
B R
BR
Whitsett
J A
JA
D000256:Adenoviridae / Q000235:genetics; D000257:Adenoviridae Infections / Q000473:pathology / Q000503:physiopathology*; D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D017931:DNA Primers; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D007249:Inflammation / Q000503:physiopathology* / Q000517:prevention & control / Q000821:virology; D008156:Luciferases / Q000096:biosynthesis / Q000235:genetics; D008171:Lung Diseases / Q000473:pathology / Q000503:physiopathology* / Q000821:virology; D051379:Mice; D008815:Mice, Inbred Strains; D018345:Mice, Knockout; D009504:Neutrophils / Q000502:physiology*; D011506:Proteins / Q000235:genetics / Q000502:physiology*; D011994:Recombinant Proteins / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014598:Uteroglobin
D017931:DNA Primers; D011506:Proteins; D011994:Recombinant Proteins; C556390:Scgb1a1 protein, mouse; D014598:Uteroglobin; D008156:Luciferases