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1 From the Academic Department of Respiratory Medicine, St. Bartholomew's and the Royal London School of Medicine and Dentistry, The London Chest Hospital, London, United Kingdom
The prevalence of asthma is increasing, despite better understanding of its pathogenesis and improved treatments. During the past 10 years, the perception of asthma has shifted from a disease primarily characterized by altered smooth muscle function to one mainly characterized by chronic inflammation. This article reviews the evidence supporting the relationship of inflammation in both the upper and lower airways, focusing on intermittent seasonal disease as well as on the more chronic and severe forms of asthma, including that associated with aspirin intolerance. It also presents evidence to support a pivotal role for the epithelial cell, together with the mast cell and the eosinophil, in initiating and maintaining inflammation in the upper and lower airways.
Key Words: airway inflammation asthma eosinophil epithelial cell granulocyte-macrophage colony-stimulating factor interleukin leukotriene mast cell rhinitis tumor necrosis factor
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