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Autophagy is selectively activated and correlates with airway remodeling in asthma

Citation

McAlinden, KD and Deshpande, DA and Ghavami, S and Xenaki, D and Sohal, SS and Oliver, BG and Haghi, M and Sharma, P, Autophagy is selectively activated and correlates with airway remodeling in asthma, American Journal of Respiratory Cell and Molecular Biology, 60, (5) pp. 541-553. ISSN 1535-4989 (2019) [Refereed Article]

Copyright Statement

Copyright © 2019 by the American Thoracic Society

DOI: doi:10.1165/rcmb.2018-0169OC

Abstract

Current asthma therapies fail to target airway remodeling that correlates with asthma severity driving disease progression that ultimately leads to loss of lung function. Macroautophagy (hereinafter "autophagy") is a fundamental cell-recycling mechanism in all eukaryotic cells; emerging evidence suggests that it is dysregulated in asthma. We investigated the interrelationship between autophagy and airway remodeling and assessed preclinical efficacy of a known autophagy inhibitor in murine models of asthma. Human asthmatic and nonasthmatic lung tissues were histologically evaluated and were immunostained for key autophagy markers. The percentage area of positive staining was quantified in the epithelium and airway smooth muscle bundles using ImageJ software. Furthermore, the autophagy inhibitor chloroquine was tested intranasally in prophylactic (3 wk) and treatment (5 wk) models of allergic asthma in mice. Human asthmatic tissues showed greater tissue inflammation and demonstrated hallmark features of airway remodeling, displaying thickened epithelium (P < 0.001) and reticular basement membrane (P  < 0.0001), greater lamina propria depth (P < 0.005), and increased airway smooth muscle bundles (P  < 0.001) with higher expression of Beclin-1 (P < 0.01) and ATG5 (autophagy-related gene 5) (P  < 0.05) together with reduced p62 (P < 0.05) compared with nonasthmatic control tissues. Beclin-1 expression was significantly higher in asthmatic epithelium and ciliated cells (P  < 0.05), suggesting a potential role of ciliophagy in asthma. Murine asthma models demonstrated effective preclinical efficacy (reduced key features of allergic asthma: airway inflammation, airway hyperresponsiveness, and airway remodeling) of the autophagy inhibitor chloroquine. Our data demonstrate cell context–dependent and selective activation of autophagy in structural cells in asthma. Furthermore, this pathway can be effectively targeted to ameliorate airway remodeling in asthma.

Item Details

Item Type:Refereed Article
Keywords:asthma, COPD, remodeling, autophagy, airways, epithelium, Beclin-1, immunohistochemistry
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Respiratory Diseases
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Respiratory System and Diseases (incl. Asthma)
UTAS Author:Sohal, SS (Dr Sukhwinder Sohal)
ID Code:133269
Year Published:2019
Web of Science® Times Cited:3
Deposited By:Health Sciences
Deposited On:2019-06-20
Last Modified:2019-08-23
Downloads:0

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