Abstract
Integrity of the airway epithelium (AE) is important in the context of inhaled allergens and noxious substances, particularly during asthma-related airway inflammation where there is increased vulnerability of the AE to cell death. Apoptosis involves a number of signaling pathways which activate procaspases leading to cleavage of critical substrates. Understanding the factors which regulate AE caspases is important for development of strategies to minimize AE damage and airway inflammation, and therefore to better control asthma. One such factor is the essential dietary metal zinc. Zinc deficiency results in enhanced AE apoptosis, and worsened airway inflammation. This has implications for asthma, where abnormalities in zinc homeostasis have been observed. Zinc is thought to suppress the steps involved in caspase-3 activation. One target of zinc is the family of inhibitor of apoptosis proteins (IAPs) which are endogenous regulators of caspases. More studies are needed to identify the roles of IAPs in regulating apoptosis in normal and inflamed airways and to study their interaction with labile zinc ions. This new information will provide a framework for future clinical studies aimed at monitoring and management of airway zinc levels as well as minimising airway damage and inflammation in asthma.
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Abbreviations
- AE:
-
Airway epithelium
- AEC:
-
Airway epithelial cell
- BALF:
-
Bronchoalveolar lavage fluid
- BIR:
-
Baculoviral IAP repeat
- Cytochrome c :
-
Cyt c
- IAP:
-
Inhibitors of apoptosis
- OVA:
-
Ovalbumin
- ROS:
-
Reactive oxygen species
- RING:
-
Really Interesting New Gene
- Smac:
-
Second mitochondria-derived activator of caspase
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Acknowledgments
We would like to acknowledge Mr Joshua Hallett for assistance with the IAP immunohistochemistry studies. This work was supported in part by NHMRC grants 519206 and 627223, as well as by a Hospital Research Foundation Scholarship. CM work in PZ laboratory was supported by the Grant EU “Microgennet” (EU Project Number 269210) funded within the Marie Curie Actions—International Research Staff Exchange Scheme (IRSES), see http://www.microgennet.org. The 16HBE14o- AEC line described by Cozens et al. (Cozens et al. 1994), were kindly provided by Dr Dieter Gruenert. We would like to acknowledge The American Journal of Physiology Lung Cellular and Molecular Physiology for their kind permission for the use of our Fig. 2b.
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Roscioli, E., Hamon, R., Lester, S. et al. Zinc-rich inhibitor of apoptosis proteins (IAPs) as regulatory factors in the epithelium of normal and inflamed airways. Biometals 26, 205–227 (2013). https://doi.org/10.1007/s10534-013-9618-2
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DOI: https://doi.org/10.1007/s10534-013-9618-2