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Inflammatory cell availability affects ozone-induced lung damage.

D Bassett1, C Elbon-Copp, S Otterbein

  • 1Department of Occupational and Environmental Health Sciences, Wayne State University, Detroit, Michigan 48202, USA. David.Bassett@wayne.edu

Journal of Toxicology and Environmental Health. Part A
|January 5, 2002
PubMed
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Neutrophils in circulating blood, not those in lung tissue, are key to ozone-induced acute lung injury. Reducing circulating neutrophils protects against lung damage from ozone exposure.

Area of Science:

  • Toxicology
  • Pulmonary Medicine
  • Immunology

Background:

  • Acute lung epithelial injury from inhaled irritants is a significant health concern.
  • The precise role of neutrophils in the early stages of such injury remains under investigation.

Purpose of the Study:

  • To investigate the role of circulating neutrophils in acute lung injury induced by ozone exposure.
  • To determine if reducing circulating neutrophil availability mitigates ozone-induced lung damage.

Main Methods:

  • Rats were treated with cyclophosphamide or neutrophil antiserum to deplete circulating neutrophils.
  • Animals were exposed to varying concentrations and durations of ozone or air.
  • Neutrophil counts in blood and lung tissue, and bronchoalveolar lavage (BAL) fluid for neutrophils and albumin, were measured.

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Main Results:

  • Cyclophosphamide depleted circulating neutrophils but not lung-marginated neutrophils; it reduced ozone-induced BAL neutrophils and albumin.
  • Neutrophil antiserum significantly reduced both circulating and lung neutrophils; it prevented ozone-induced neutrophil accumulation but not lung permeability damage.
  • Reduced circulating neutrophil availability correlated with decreased ozone-induced lung damage.

Conclusions:

  • Circulating neutrophils, rather than tissue-resident neutrophils, play a critical role in ozone-induced acute lung injury.
  • Reducing circulating neutrophil levels can ameliorate lung damage caused by ozone exposure.
  • These findings highlight potential therapeutic targets for managing irritant-induced lung injury.