Proinflammatory cytokines induce bronchial hyperplasia and squamous metaplasia in smokers: implications for chronic obstructive pulmonary disease therapy

American Journal of Respiratory Cell and Molecular Biology
Michael HerfsPhilippe Delvenne

Abstract

Tracheobronchial squamous metaplasia is common in smokers, and is associated with both airway obstruction in chronic obstructive pulmonary disease (COPD) and increased risk of lung cancer. Although this reversible epithelial replacement is almost always observed in association with chronic inflammation, the role of inflammatory mediators in the pathogenesis of squamous metaplasia remains unclear. In the present study, we investigated the implication of cigarette smoke-mediated proinflammatory cytokine up-regulation in the development and treatment of tracheobronchial epithelial hyperplasia and squamous metaplasia. Using immunohistological techniques, we showed a higher epithelial expression of TNF-α, IL-1β, and IL-6, as well as an activation of NF-κB and activator protein-1/mitogen-activated protein kinase signaling pathways in the respiratory tract of smoking patients, compared with the normal ciliated epithelium of nonsmoking patients. In addition, we demonstrated that these signaling pathways strongly influence the proliferation and differentiation state of in vitro-generated normal human airway epithelial basal cells. Finally, we exposed mice to cigarette smoke for 16 weeks, and demonstrated that anti-TNF-α (etanercept), an...Continue Reading

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