Regional variation in iron and iron-binding proteins within the lungs of smokers

Michael E. Nelson, Amy R. O'Brien-Ladner, Lewis J. Wesselius

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The lungs of cigarette smokers are known to contain increased concentrations of extracellular ferritin-bound iron. Reductants present in cigarette smoke may mobilize alveolar ferritin-bound iron, which could then promote oxidative injury to lung cells. Because iron-mediated oxidative injury may be relevant to the pathogenesis of emphysema and lung cancer, which have a predilection for upper lobes, we sought to determine whether concentrations of extracellular iron, ferritin, and transferrin differed in upper and lower lobes of cigarette smokers. Bronchoalveolar lavage (BAL) was performed in the upper and lower lobes of 15 asymptomatic smokers and six healthy nonsmokers. BAL fluid recovered from upper lobes of smokers contained higher concentrations of iron (p < 0.01) and ferritin (p < 0.006) and lower concentrations of transferrin (p < 0.003) compared with the lower lobes. In contrast, BAL fluid recovered from upper and lower lobes of nonsmokers contained much lower concentrations of iron and ferritin, and concentrations were similar in both sites. These findings indicate that, compared with the lower lobes, upper lobes of the lungs of smokers contain higher extracellular concentrations of ferritin-bound iron and decreased concentrations of transferrin. This distribution of lung iron and iron-binding proteins may promote oxidative injury in the upper lobes of smokers.

Original languageEnglish (US)
Pages (from-to)1353-1358
Number of pages6
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume153
Issue number4
StatePublished - 1996
Externally publishedYes

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Iron-Binding Proteins
Ferritins
Iron
Lung
Transferrin
Tobacco Products
Bronchoalveolar Lavage Fluid
Reducing Agents
Emphysema
Wounds and Injuries
Lung Injury
Bronchoalveolar Lavage
Smoke
Lung Neoplasms

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

Cite this

Regional variation in iron and iron-binding proteins within the lungs of smokers. / Nelson, Michael E.; O'Brien-Ladner, Amy R.; Wesselius, Lewis J.

In: American Journal of Respiratory and Critical Care Medicine, Vol. 153, No. 4, 1996, p. 1353-1358.

Research output: Contribution to journalArticle

Nelson, Michael E. ; O'Brien-Ladner, Amy R. ; Wesselius, Lewis J. / Regional variation in iron and iron-binding proteins within the lungs of smokers. In: American Journal of Respiratory and Critical Care Medicine. 1996 ; Vol. 153, No. 4. pp. 1353-1358.
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