Sex differences in the development of airway epithelial tolerance to naphthalene

K. M. Sutherland, P. C. Edwards, T. J. Combs, L. S. van Winkle

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Exposure to air pollution has been linked to pulmonary diseases. Naphthalene (NA), an abundant polycyclic aromatic hydrocarbon in tobacco smoke and urban air, is a model toxicant for air pollution effects in the lung. Repeated exposures to NA in male mice result in tolerance, defined as the emergence of a resistant cell phenotype after prior exposure. Tolerance has not been studied in females. Females have sex differences in airway epithelial responses and in the prevalence of certain airway diseases. Male and female mice were exposed to a toleranceinducing regimen of NA, and lungs were examined by airway level to characterize the cellular changes associated with repeated NA exposure and to assess the expression of genes and proteins involved in NA bioactivation and detoxification. The airway epithelium in treated males resembled that of controls. Females in the tolerant state were characterized by dense populations of ciliated cells in midlevel, distal, and bifurcating airways and a lower abundance of Clara cells at all airway levels. Cytotoxicity following a secondary challenge dose was also greater in females than males. Furthermore, females had decreased gene/protein expression of CYP2F2, a P-450 that metabolizes NA to a toxic epoxide, and glutamate-cysteine ligase, the rate-limiting enzyme in glutathione synthesis, than NA-tolerant males at all airway levels examined. We conclude that, while females develop tolerance, sex differences exist in the tolerant state by airway level, and females remain more susceptible than males to repeated exposures to NA.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume302
Issue number1
DOIs
StatePublished - Jan 2012

Fingerprint

Sex Characteristics
Air Pollution
Glutamate-Cysteine Ligase
Lung
naphthalene
Poisons
Polycyclic Aromatic Hydrocarbons
Epoxy Compounds
Smoke
Lung Diseases
Tobacco
Glutathione
Proteins
Epithelium
Air
Phenotype
Gene Expression
Enzymes
Population

Keywords

  • Injury and repair
  • Lung
  • Polycyclic aromatic hydrocarbons
  • Xenobiotics

ASJC Scopus subject areas

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

Cite this

Sex differences in the development of airway epithelial tolerance to naphthalene. / Sutherland, K. M.; Edwards, P. C.; Combs, T. J.; van Winkle, L. S.

In: American Journal of Physiology - Lung Cellular and Molecular Physiology, Vol. 302, No. 1, 01.2012.

Research output: Contribution to journalArticle

Sutherland, K. M. ; Edwards, P. C. ; Combs, T. J. ; van Winkle, L. S. / Sex differences in the development of airway epithelial tolerance to naphthalene. In: American Journal of Physiology - Lung Cellular and Molecular Physiology. 2012 ; Vol. 302, No. 1.
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