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Review: Oxidant—antioxidant imbalance in asthma: scientific evidence, epidemiological data and possible therapeutic options

Department of Physiology and Pharmacology, Health Sciences Center North West Virginia University Morgantown WV 26506, USA, anadeem{at}hsc.wvu.edu

Anbrin Masood

Behavioral Medicine & Psychiatry, Health Sciences Center West Virginia University Morgantown West Virginia, USA

Nahid Siddiqui

Institute of Biotechnology, Amity University, Sector 44 Noida, India

Prevalence of asthma has increased considerably in recent decades throughout the world especially in developed countries. Airway inflammation is thought to be prime cause for repeated episodes of airway obstruction in asthmatics. Several studies have shown that reactive oxygen species (ROS) play a key role in initiation as well as amplification of inflammation in asthmatic airways. Excessive ROS production in asthma leads to alteration in key enzymatic as well as nonenzymatic antioxidants such as glutathione, vitamins C and E, beta-carotene, uric acid, thioredoxin, superoxide dismutases, catalase, and glutathione peroxidases leading to oxidant—antioxidant imbalance in airways. Oxidant—antioxidant imbalance leads to pathophysiological effects associated with asthma such as vascular permeability, mucus hypersecretion, smooth muscle contraction, and epithelial shedding. Epidemiological data also support the scientific evidence of oxidant—antioxidant imbalance in asthmatics. Therefore, the supplementation of antioxidants to boost the endogenous antioxidants or scavenge excessive ROS production could be utilized to dampen/prevent the inflammatory response in asthma by restoring oxidant—antioxidant balance. This review summarizes the scientific and epidemiological evidence linking asthma with oxidant—antioxidant imbalance and possible antioxidant strategies that can be used therapeutically for better management of asthma.

Key Words: Antioxidants • Asthma • Inflammation • Oxidative • Stress

Therapeutic Advances in Respiratory Disease, Vol. 2, No. 4, 215-235 (2008)
DOI: 10.1177/1753465808094971


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