title: CCSP deficiency does not alter surfactant homeostasis during adenoviral infection.
abstract: Clara cell secretory protein (CCSP) deficiency in mice is associated with increased susceptibility to pulmonary inflammation after hyperoxia or viral infection. Because adenoviral exposure perturbs pulmonary surfactant homeostasis in vivo, we hypothesized that CCSP deficiency would influence surfactant metabolism after pulmonary infection. Alveolar and total lung saturated phosphatidylcholine pool sizes were similar in CCSP-deficient [CCSP(-/-)] and wild-type [CCSP(+/+)] mice before and 7 days after intratracheal administration of adenovirus. Radiolabeled choline and palmitate incorporation into saturated phosphatidylcholine was similar, and there was no alteration by previous infection 7 days before the incorporation measurements. Furthermore, CCSP deficiency did not influence clearance of [(14)C]dipalmitoylphosphatidylcholine and (125)I-labeled recombinant surfactant protein C. Increased persistence of alveolar capillary leak was observed in CCSP(-/-) mice after adenoviral infection. Surfactant lipid homeostasis was not influenced by CCSP before or after administration of adenovirus to the lung. Persistence of alveolar capillary leak in CCSP(-/-) mice after adenovirus provides further evidence for the role of CCSP in the regulation of pulmonary inflammation.
authors.affiliation: Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA. machiko.ikegami@chmcc.org
authors.forename: M
authors.initials: M
authors.lastname: Ikegami
authors.forename: K S
authors.initials: KS
authors.lastname: Harrod
authors.forename: J A
authors.initials: JA
authors.lastname: Whitsett
authors.forename: A H
authors.initials: AH
authors.lastname: Jobe
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000493:pharmacokinetics; D000257:Adenoviridae Infections / Q000378:metabolism*; D000418:Albumins / Q000493:pharmacokinetics; D000818:Animals; D002199:Capillary Permeability / Q000502:physiology; D002250:Carbon Radioisotopes; D002794:Choline / Q000493:pharmacokinetics; D006706:Homeostasis / Q000502:physiology*; D007457:Iodine Radioisotopes; D051379:Mice; D008822:Mice, Transgenic; D019308:Palmitic Acid / Q000493:pharmacokinetics; D011024:Pneumonia, Viral / Q000378:metabolism*; D011506:Proteins / Q000235:genetics*; D011510:Proteolipids / Q000378:metabolism*; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants / Q000378:metabolism*; D014316:Tritium; D014598:Uteroglobin
chemical_list: D000418:Albumins; D002250:Carbon Radioisotopes; D007457:Iodine Radioisotopes; D011506:Proteins; D011510:Proteolipids; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants; C556390:Scgb1a1 protein, mouse; D014316:Tritium; D015060:1,2-Dipalmitoylphosphatidylcholine; D019308:Palmitic Acid; D014598:Uteroglobin; D002794:Choline