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Basement membrane remodelling in COPD responds to inhaled corticosteroids
conference contribution
posted on 2023-05-24, 10:43 authored by Soltani, A, Sukhwinder SohalSukhwinder Sohal, Reid, D, Weston, S, Muller, HK, Wood-Baker, R, Eugene WaltersEugene WaltersIntroduction Our knowledge about the effects of inhaled corticosteroids (ICS) on airway remodelling in chronic obstructive pulmonary disease (COPD) is limited. We have previously reported that in bronchial biopsies (BB) from COPD subjects the reticular basement membrane (Rbm) is fragmented and hypervascular. In this study we have examined the effects of ICS on these airway remodelling changes in COPD. Methods In a double blind and randomised study we compared the effects of 6 months of fluticasone propionate (FP, 0.5 mg/twice daily) with placebo. BB were stained with collagen IV antibody to mark vessel endothelial basement membrane. The length of Rbm splits and the number and area of vessels in the Rbm were compared before and after treatment. Results COPD subjects were randomized 2 : 1 to receive either FP (n = 15) or placebo (n = 7). There were no differences between the groups before treatment. The length of Rbm splitting, as an index of Rbm fragmentation, was significantly decreased by FP [median (range) 19.1 (0.2–42.8) before vs. 2.6 (0–88.6) lm/lm Rbm · 100 after, p < 0.03] but not by placebo [24 (6.6–109) before vs. 26.9 (2.5–48.5) lm/lm Rbm · 100 after, p = 0.7]. The number and area of vessels within the Rbm did not change following either FP or placebo. Conclusion We have proposed that Rbm fragmentation is the result of local proteinase activity involved in active epithelial- mesenchymal transition (EMT). The results are likely to represent a suppression of this process by ICS, but this needs confirmation by further investigation of specific EMT markers.
History
Publication title
The Thoracic Society of Australia & New Zealand Annual Scientific MeetingDepartment/School
Menzies Institute for Medical ResearchEvent title
The Thoracic Society of Australia & New Zealand Annual Scientific MeetingEvent Venue
Brisbane, AustraliaDate of Event (Start Date)
2010-04-01Date of Event (End Date)
2010-04-01Repository Status
- Restricted