title: Comparison of airway wall remodeling in asthma and COPD: biopsy findings.
abstract: BACKGROUND
  Bronchial remodeling is currently known to affect not only patients with asthma, but also COPD patients. Some studies have demonstrated that basement membrane thickening and destruction of the bronchial epithelium are also found in COPD. The aim of the study was to compare  the basement membrane thickness (BMT) and epithelial damage in biopsy specimens from patients with asthma and COPD.
  
  
  METHODS
  The study was performed in 20 subjects with asthma and 12 subjects with COPD, who had not been treated with corticosteroids for at least 3 months before study enrollment.  Subjects' characteristics were based on the results of clinical assessment, allergic skin-prick tests, lung function testing, and methacholine bronchial challenge. All subjects underwent bronchoscopy with forceps biopsies of bronchial mucosa. Light-microscope and semi-automatic software were  used to measure BMT in hematoxylin-eosin stained sections. Total (denudation) and partial epithelial damage were assessed independently by 2 pathologists.
  
  
  RESULTS
  The mean BMT in subjects with asthma was 12.54 ± 2.8 μm, and only 7.81 ± 2.0 μm in COPD patients (P  < .001). Overall percentage of the basement membrane length lined with damaged epithelium was 45 ± 20% in the asthma group and 47 ± 22% in the COPD group (difference not significant). Complete and partial epithelial damage did not differ between the groups.
  
  
  CONCLUSIONS
  BMT  might be a histopathological parameter helpful in distinguishing asthma and COPD patients, whereas the extent and pattern of epithelial damage is not.
authors: Department of Internal Medicine, The Biostructure Centre, Medical University of Warsaw, Warsaw, Poland. j_kosciuch@o2.pl
authors: Justyna
authors: J
authors: Kosciuch
authors: Rafal
authors: R
authors: Krenke
authors: Katarzyna
authors: K
authors: Gorska
authors: Wojciech
authors: W
authors: Baran
authors: Marek
authors: M
authors: Kujawa
authors: Katarzyna
authors: K
authors: Hildebrand
authors: Ryszarda
authors: R
authors: Chazan
mesh_terms: D000328:Adult; D001249:Asthma / Q000473:pathology*; D001485:Basement Membrane / Q000473:pathology; D001980:Bronchi / Q000473:pathology*; D001999:Bronchoscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000473:pathology*; D055815:Young Adult