CD14 is an essential mediator of LPS-induced airway disease

David M. Brass, John W. Hollingsworth, Erin McElvania-Tekippe, Stavros Garantziotis, Imtaz Hossain, David A. Schwartz

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Chronic lipopolysaccharide (LPS) inhalation in rodents recapitulates many classic features of chronic obstructive pulmonary disease seen in humans, including airways hyperresponsiveness, neutrophilic inflammation, cytokine production in the lung, and small airways remodeling. CD14-deficient mice (C57BL/6CD14-/-) have an altered response to systemic LPS, and yet the role of CD14 in the response to inhaled LPS has not been defined. We observed that C57BL/6CD14-/- mice demonstrate no discernable physiological or inflammatory response to a single LPS inhalation challenge. However, the physiological (airways hyperresponsiveness) and inflammatory (presence of neutrophils and TNF-α in whole lung lavage fluid) responsiveness to inhaled LPS in C57BL/6CD14-/- mice was restored by instilling soluble CD14 intratracheally. Intratracheal instillation of wild-type macrophages into C57BL/6CD14-/- mice restored neutrophilic inflammation only and failed to restore airways hyperresponsiveness or TNF-α protein in whole lung lavage. These findings demonstrate that CD14 is critical to LPS-induced airway disease and that macrophage CD14 is sufficient to initiate neutrophil recruitment into the airways but that CD14 may need to interact with other cell types as well for the development of airways hyperresponsiveness and for cytokine production.

Original languageEnglish (US)
Pages (from-to)L77-L83
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume293
Issue number1
DOIs
StatePublished - Jul 1 2007

Keywords

  • Airways hyperresponsiveness
  • Inflammation
  • Lipopolysaccharide
  • Tumor necrosis factor

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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