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

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• 作者：Coen H. Wiegman ; PhD^a ; ^&lowast ; ; ^{c.wiegman@imperial.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Charalambos Michaeloudes ; PhD^a ; ^&lowast ; ; Gulammehdi Haji ; MD^a ; ^&lowast ; ; Priyanka Narang ; PhD^a ; Colin J. Clarke ; MSc^a ; Kirsty E. Russell ; PhD^a ; Wuping Bao ; MD^a ; Stelios Pavlidis ; PhD^b ; Peter J. Barnes ; MD^a ; Justin Kanerva ; MSc^c ; Anton Bittner ; PhD^c ; Navin Rao ; PhD^c ; Michael P. Murphy ; PhD^d ; Paul A. Kirkham ; PhD^a ; Kian Fan Chung ; MD^a ; Ian M. Adcock ; PhD^a ; on behalf of COPDMAP^&Dagger ; Christopher E. Brightling ; Donna E. Davies ; Donna K. Finch ; Andrew J. Fisher ; Alasdair Gaw ; Alan J. Knox ; Ruth J. Mayer ; Michael Polkey ; Michael Salmon ; David Singh
• 关键词：Ozone ; inflammation ; airway smooth muscle ; mitochondria ; chronic obstructive pulmonary disease ; airway hyperresponsiveness ; oxidative stress ; antioxidant ; proliferation ; MitoQ
• 刊名：Journal of Allergy and Clinical Immunology
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：136
• 期：3
• 页码：769-780
• 全文大小：1960 K

文摘

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 (螖唯m), 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 螖唯m, 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-尾–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.