Reviews and Feature ArticlesOxidative stress in allergic respiratory diseases☆,☆☆
Section snippets
Reactive oxygen species defined
The major function of the respiratory and cardiovascular system is the delivery of oxygen for use in aerobic energy production by means of oxidative phosphorylation. The features that make oxygen ideal for aerobic energy production (ie, atmospheric abundance and a high affinity for electrons) are also its Achilles' heel. For instance, one electron addition to oxygen produces superoxide, a second electron yields hydrogen peroxide, and a third electron leads to the formation of the hydroxyl
Sources of reactive oxygen species
Normal metabolic processes in all cells are the major source of reactive oxygen species (Fig 3).
Measurement and toxicity of reactive oxygen species
Electron spin resonance is the only method that directly measures free radicals, but the evanescent nature of many reactive oxygen species has made them difficult to measure in vivo, and instead many investigators use spin trapping to trap the free radical in a more stable molecule that can be readily measured in biologic systems. Recently, the ability to collect and analyze exhaled condensates has allowed for the direct assessment of hydrogen peroxide and nitric oxide in allergic respiratory
Antioxidant defenses
The primary defense against reactive oxygen species is endogenous antioxidants, which can be subdivided into enzymatic and nonenzymatic categories. The enzymatic antioxidants include the families of superoxide dismutase (SOD), catalase, glutathione peroxidase, glutathione S-transferase, and thioredoxin. Furthermore, each family has isozymes that are distinguished primarily by their distribution. For instance, the 3 mammalian SODs are cytosolic (SOD1), mitochondrial (SOD2), and extracellular
Asthma
Many observations suggest that oxidative stress plays an important role in the pathogenesis of asthma. Although it is difficult to get direct measurements of reactive oxygen species in asthmatic patients, recent studies of exhaled gases from asthmatic patients have shown increased hydrogen peroxide13, 53, 54 and nitric oxide55 levels. Furthermore, an increase in reactive oxygen species production is inversely correlated with FEV1.14 Airway inflammatory cells are the likely source of these
Therapeutic implications
There are 2 strategies for treating oxidative stress asthma: reducing exposure to reactive oxygen species and augmenting antioxidant defenses. There are already several studies suggesting that reducing exposure to environmental oxidants, such as nitrites and ozone, might decrease asthmatic exacerbations through the attenuation of the activity of pulmonary inflammatory cells.81, 82 For instance, ozone decreases FEV1 by 12.5% compared with filtered air,82 and children playing sports (hence more
Acknowledgements
We thank Drs E. Rand Sutherland, Brian J. Day, and Elizabeth Regan for their critical reading of the manuscript.
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Supported by National Institutes of Health grants HL-04407 (R.P.B.), HL-31992 (J.D.C), and HL-42444 (J.D.C) and by Incara Pharmaceuticals Inc. Dr Crapo is a consultant for and holds equity in Incara Pharmaceuticals.
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Reprint requests: Russell P. Bowler, MD, PhD, National Jewish Medical and Research Center, K736a, 1400 Jackson St, Denver, CO 80206.