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Oxidative stress-induced mitochondrial dysfunction drives inflammation and airway smooth muscle remodeling in patients with chronic obstructive pulmonary disease

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journal contribution
posted on 17.02.2016, 11:15 by C. H. Wiegman, C. Michaeloudes, G. Haji, P. Narang, C. J. Clarke, K. E. Russell, W. Bao, S. Pavlidis, P. J. Barnes, J. Kanerva, A. Bittner, N. Rao, M. P. Murphy, P. A. Kirkham, K. F. Chung, I. M. Adcock, Christopher Edward Brightling, D. E. Davies, D. K. Finch, A. J. Fisher, A. Gaw, A. J. Knox, R. J. Mayer, M. Polkey, M. Salmon, D. Singh
Background Inflammation and oxidative stress play critical roles in patients with chronic obstructive pulmonary disease (COPD). Mitochondrial oxidative stress might be involved in driving the oxidative stress-induced pathology. Objective We sought to determine the effects of oxidative stress on mitochondrial function in the pathophysiology of airway inflammation in ozone-exposed mice and human airway smooth muscle (ASM) cells. Methods Mice were exposed to ozone, and lung inflammation, airway hyperresponsiveness (AHR), and mitochondrial function were determined. Human ASM cells were isolated from bronchial biopsy specimens from healthy subjects, smokers, and patients with COPD. Inflammation and mitochondrial function in mice and human ASM cells were measured with and without the presence of the mitochondria-targeted antioxidant MitoQ. Results Mice exposed to ozone, a source of oxidative stress, had lung inflammation and AHR associated with mitochondrial dysfunction and reflected by decreased mitochondrial membrane potential (ΔΨm), increased mitochondrial oxidative stress, and reduced mitochondrial complex I, III, and V expression. Reversal of mitochondrial dysfunction by the mitochondria-targeted antioxidant MitoQ reduced inflammation and AHR. ASM cells from patients with COPD have reduced ΔΨm, adenosine triphosphate content, complex expression, basal and maximum respiration levels, and respiratory reserve capacity compared with those from healthy control subjects, whereas mitochondrial reactive oxygen species (ROS) levels were increased. Healthy smokers were intermediate between healthy nonsmokers and patients with COPD. Hydrogen peroxide induced mitochondrial dysfunction in ASM cells from healthy subjects. MitoQ and Tiron inhibited TGF-β-induced ASM cell proliferation and CXCL8 release. Conclusions Mitochondrial dysfunction in patients with COPD is associated with excessive mitochondrial ROS levels, which contribute to enhanced inflammation and cell hyperproliferation. Targeting mitochondrial ROS represents a promising therapeutic approach in patients with COPD.

History

Citation

Journal of Allergy and Clinical Immunology, 2015, 136 (3), pp. 769-780

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Medicine/Department of Infection, Immunity and Inflammation

Version

VoR (Version of Record)

Published in

Journal of Allergy and Clinical Immunology

Publisher

Elsevier (Mosby) for American Academy of Allergy, Asthma and Immunology

issn

0091-6749

eissn

1097-6825

Acceptance date

30/01/2015

Copyright date

2015

Available date

17/02/2016

Publisher version

http://www.sciencedirect.com/science/article/pii/S0091674915002651

Language

en