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Airway Remodeling: Potential Contributions of Subepithelial Fibrosis and Airway Smooth Muscle Hypertrophy/Hyperplasia to Airway Narrowing in Asthma

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Recently, much attention has been focused on the airway structural changes accompanying chronic, severe asthma, and the potential ramifications of these changes for airway function and medical management. Airway remodeling may exaggerate airway narrowing by: (i) thickening of the airway wall internal to the smooth muscle, thereby increasing the luminal obstruction generated by a given degree of smooth muscle shortening; (ii) increasing the amount of smooth muscle, thereby increasing shortening; and/or (iii) reducing the load on the smooth muscle, either by increasing the compliance of the airway wall or by reducing airway-parenchymal interdependence. The possibility also exists that airway remodeling represents a protective mechanism against excessive airway narrowing. The major airway structural changes occurring in asthma are subepithelial protein deposition and increased airway smooth muscle mass (hypertrophy, hyperplasia, or both). Several investigators have found correlations between the magnitudes of subepithelial thickening and smooth muscle hypertrophy/hyperplasia and the severity of airways disease, though interpretation has been made difficult by study differences in patient population, treatment, indices of disease severity, and morphometric technique. Taken together, these data suggest that increases in airway remodeling may contribute significantly to the airflow obstruction observed in patients with asthma. However, data proving a causal relationship between airway remodeling and asthma severity remain elusive.
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Document Type: Research Article

Publication date: November 1, 1998

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma and by having the potential to directly impact the quality of patient care. AAP welcomes the submission of original works including peer-reviewed original research and clinical trial results. Additionally, as the official journal of the Eastern Allergy Conference (EAC), AAP will publish content from EAC poster sessions as well as review articles derived from EAC lectures.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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