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Am. J. Respir. Cell Mol. Biol., Volume 26, Number 4, April, 2002 447-452

Neutrophil Elastase Induces MUC5AC Gene Expression in Airway Epithelium via a Pathway Involving Reactive Oxygen Species

Bernard M. Fischer and Judith A. Voynow

Division of Pediatric Pulmonary Diseases, Duke University Medical Center, Durham, North Carolina

Neutrophil-predominant airway inflammation and mucus obstruction of the airways are major pathologic features of chronic airway diseases, including cystic fibrosis and chronic bronchitis. Neutrophils release elastase, a serine protease that impairs mucociliary clearance and stimulates goblet cell metaplasia and mucin production. We previously reported that neutrophil elastase increases expression of a major respiratory mucin gene, MUC5AC, by enhancing mRNA stability. However, the molecular mechanisms of elastase-regulated MUC5AC expression are not known. We hypothesized that reactive oxygen species, generated by elastase treatment, mediate MUC5AC gene expression. To test this hypothesis, A549, a respiratory epithelial cell line, was treated with elastase in the presence or absence of the oxygen radical scavenger, dimethylthiourea, or the iron chelator, desferrioxamine. MUC5AC mRNA levels were assessed by Northern analysis. Both antioxidants significantly inhibited elastase-induced MUC5AC gene expression. Dimethylthiourea also inhibited the neutrophil elastase (NE)-induced increase in MUC5AC expression in normal human bronchial epithelial cells. To determine whether elastase treatment generated reactive oxygen species, A549 and normal human bronchial epithelial cells were loaded with dichlorodihydrofluorescein, a fluorescent indicator of oxidative stress. NE treatment increased cellular fluorescence in both cell types, indicating generation of intracellular reactive oxygen species. We conclude that NE treatment increases MUC5AC gene expression by an oxidant-dependent mechanism.

Abbreviations: methoxysuccinyl-Ala-Ala-Pro-Val-chloromethyl ketone, AAPV-CMK; cystic fibrosis, CF; dichlorodihydrofluorescein, DCF; desferrioxamine, DF; dimethylthiourea, DMTU; iron-responsive element, IRE; iron-responsive element-binding protein, IRE-BP; lactate dehydrogenase, LDH; macrophage inflammatory protein-2, MIP-2; neutrophil elastase, NE; normal human bronchial epithelial cells, NHBE cells; reactive oxygen species, ROS; sodium dodecyl sulfate, SDS; saline sodium citrate, SSC.




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