Particulate matter in cigarette smoke alters iron homeostasis to produce a biological effect

American Journal of Respiratory and Critical Care Medicine
Andrew J GhioKent E Pinkerton

Abstract

Lung injury after cigarette smoking is related to particle retention. Iron accumulates with the deposition of these particles. We tested the postulate that (1) injury after smoking correlates with exposure to the particulate fraction of cigarette smoke, (2) these particles alter iron homeostasis, triggering metal accumulation, and (3) this alteration in iron homeostasis affects oxidative stress and inflammation. Rats and human respiratory epithelial cells were exposed to cigarette smoke, filtered cigarette smoke, and cigarette smoke condensate (the particulate fraction of smoke), and indices of iron homeostasis, oxidative stress, and inflammatory injury were determined. Comparable measures were also evaluated in nonsmokers and smokers. After exposure of rats to cigarette smoke, increased lavage concentrations of iron and ferritin, serum ferritin levels, and nonheme iron concentrations in the lung and liver tissue all increased. Lavage ascorbate concentrations were decreased, supporting an oxidative stress. After filtering of the cigarette smoke to remove particles, most of these changes were reversed. Exposure of cultured respiratory epithelial cells to cigarette smoke condensate caused a similar accumulation of iron, metal-dep...Continue Reading

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