Mitochondrial structural changes and dysfunction are associated with experimental allergic asthma

The Journal of Immunology : Official Journal of the American Association of Immunologists
Ulaganathan MabalirajanBalaram Ghosh

Abstract

An imbalance between Th1 and Th2 immune response is crucial for the development of pathophysiological features of asthma. A Th2-dominant response produces oxidative stress in the airways, and it is thought to be one of the crucial components of asthma pathogenesis. Although mitochondrion is a crucial organelle to produce endogenous reactive oxygen species, its involvement in this process remains unexplored as yet. We demonstrate in this study that OVA-induced experimental allergic asthma in BALB/c mice is associated with mitochondrial dysfunction, such as reduction of cytochrome c oxidase activity in lung mitochondria, reduction in the expression of subunit III of cytochrome c oxidase in bronchial epithelium, appearance of cytochrome c in the lung cytosol, decreased lung ATP levels, reduction in the expression of 17 kDa of complex I in bronchial epithelium, and mitochondrial ultrastructural changes such as loss of cristae and swelling. However, there was no change in the expression of subunits II and III of cytochrome c oxidase. Interestingly, administration of IL-4 mAb reversed these mitochondrial dysfunction and structural changes. In contrast, IFN-gamma mAb administration neither reversed nor further deteriorated the mitocho...Continue Reading

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