|Year : 2016 | Volume
| Issue : 1 | Page : 4-11
Clinical correlation of oxidant-antioxidant balance and Vitamin D in asthmatic patients
Swarajya Singh1, Brijendra Pratap Mishra2, VK Arora1, Jyoti Batra3, Jhansi Lakshmi Lingidi2
1 Department of T.B. and Chest, Santosh Medical College, Ghaziabad, Uttar Pradesh, India
2 Department of Biochemistry, Mayo Institute of Medical Sciences, Barabanki, Uttar Pradesh, India
3 Department of Biochemistry, Santosh Medical College, Ghaziabad, Uttar Pradesh, India
|Date of Web Publication||2-Aug-2016|
Brijendra Pratap Mishra
Department of Biochemistry, Mayo Institute of Medical Sciences, Barabanki, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
Asthma is a chronic inflammatory lung disease that results in airflow limitation, hyperreactivity, and airway remodeling. There is strong evidence that an imbalance between the reducing and oxidizing systems lead more oxidative state in asthma. Endogenous and exogenous reactive oxygen species and reactive nitrogen species play a major role in the airway inflammation and cause of severe pathogenesis. Atmospheric pollution, dietary changes, changes in allergen load, improvements in health and hygiene, and lifestyle changes have all been proposed for asthma. It has been observed, poor antioxidant rich nutrition and lack of Vitamin D are also a common cause for pathogenesis of asthma. Vitamin D as lung immunomodulator and Vitamins A, C, E as antioxidants improves the complications of inflamed airflow in asthma. In this review study, we will summarize the current knowledge and discuss the current pharmacological strategies regarding the role of antioxidant activity and Vitamin D in favor to regulate and prognose to inflammatory asthma.
Keywords: Antioxidant, asthma, oxidative stress, Vitamin D
|How to cite this article:|
Singh S, Mishra BP, Arora V K, Batra J, Lingidi JL. Clinical correlation of oxidant-antioxidant balance and Vitamin D in asthmatic patients. Indian J Allergy Asthma Immunol 2016;30:4-11
|How to cite this URL:|
Singh S, Mishra BP, Arora V K, Batra J, Lingidi JL. Clinical correlation of oxidant-antioxidant balance and Vitamin D in asthmatic patients. Indian J Allergy Asthma Immunol [serial online] 2016 [cited 2020 Jan 24];30:4-11. Available from: http://www.ijaai.in/text.asp?2016/30/1/4/187551
| Introduction|| |
Asthma is the most common chronic inflammatory disorder with an unknown etiology associated with increased reactive oxygen species (ROS) and characterized by cough, wheezing, and dyspnea. ,, Airway reactivity and airflow limitations are the result of complex involvement between numerous cell types and mediators in asthma ,,,, [Figure 1]. According to a recently proposed hierarchical oxidative stress, , a low level of oxidative stress, such as exposure to diesel exhaust products for 6 h at a concentration of 10-50 mg/mL,  leads to the activation of the transcription factor, nuclear erythroid 2 p45-related factor 2 (Nrf2), which encodes more than 200 genes. These gene products are responsible for a wide range of antioxidant, anti-inflammatory, cytoprotective, and detoxification functions and include catalase, superoxide dismutase (SOD)-3, heme oxygenase-1, glutathione-S-transferases, nicotinamide adenine dinucleotide phosphate (NAD (P) H) quinone oxidoreductase 1, glutathione peroxidase, and glucuronosyltransferase-1a6 (UGT-1a6).  Antioxidants can restore cellular redox homeostasis at low level of oxidative stress. Enhancement in the level of oxidative stress could be triggering a cytotoxic response initiating in the mitochondria and may lead to cellular apoptosis or necrosis. ROS is one of the most important components of oxidative stress produced in asthmatic inflammatory process. Activated eosinophils, neutrophils, monocytes, and macrophages generate superoxides (O 2− ) via a membrane-associated NADPH-dependent complex. The subsequent dismutation of O 2− can result in the formation of hydrogen peroxide (H 2 O 2 ). O 2− and H 2 O 2 are moderate oxidants, and both are critical in the formation of potent cytotoxic-free radicals in biological systems through their interactions with other molecules.  This process is involved in asthmatic inflammation; moreover, the concentration of nitric oxide (NO) is increased in airways of asthmatic subjects.  Excess production of ROS is harmful because these induced oxidation of DNA, lipids, and proteins which may result to direct damage and evoke cellular responses through the production of secondary reactive species.  The influence of nutrition on chronic bronchial asthma has an important place in the management of this disease. Evidence suggests that specific inflammatory abnormalities exist in the airways of subjects suffering from mild-to-moderate persistent asthma, in whom an inflammatory state is often associated with increased generation of ROS and the damaging effects of free radicals. For this reason, oxidant stress may be an important pathogenic factor in the progress of the disease. The role of nutrition in bronchial asthma is related to Vitamin D and antioxidant Vitamins A, C, E, etc.
The aim of this review study is to conclude the correlation of oxidant-antioxidant balance (oxidative stress) with regard to the role of Vitamin D in asthmatic patients.
| Pathophysiology of asthma|| |
The etiology of allergy
When the tolerance power against the allergens fail, then the development of allergy occurs.  Although this process may occur at any age, it typically occurs in early infancy. The process of tolerance is facilitated largely in the neonatal and infant gut and is referred to as oral tolerance. Three factors are instrumental in the success of oral tolerance: Normal microbial gut flora colonization, antigen encounter, and a host of nonspecific immunomodulatory factors. It appears that all of these factors operating together promote oral and systemic allergen tolerance. It is supposed the development of allergy is result of delay processing of antigen tolerance; this process operates on a genetically predetermined basis. The possible etiological factors for asthma listed in [Table 1].
Possible factors for the rising prevalence of asthma
Atmospheric pollution, dietary changes, changes in allergen load, improvements in health and hygiene (the hygiene hypothesis), and lifestyle changes have all been proposed for this phenomenon.  It is studied that no one factor is responsible for asthma etiology and that the condition is probably multifactorial in etiology as well as clinical expression. There is potential role of overlapping genetic predispositions for the development of asthma. These include predisposition to abnormal lung growth, resulting in lower lung function; delayed immune maturation; predisposition to lower respiratory viral infections; early allergic sensitization; and predisposition to bronchial hyperresponsiveness. Networks of genes and environmental modification of gene expression via epigenetic mechanisms are also likely to be important. Antenatal exposures that increase the risk of asthma include tobacco smoke and ambient and indoor air pollution. Early-life environmental exposures may also increase the risk of asthma via impacts on lung growth and immune maturation. Synergistic interactions between viral lower respiratory infections and allergic sensitization in early life appear to be especially important in increasing the risk of subsequent asthma.
Oxidative stress in asthma
Free radicals are short-lived and independent chemicals that have at least one unpaired electron in their outer most orbit. Free radicals try to make more stable structures by reacting with other molecules.  Few factors and metabolic pathways are the path for the generation of free radicals.  Molecular oxygen is main source for the formation of free radicals within an organism. In certain pathological conditions, the quantity of free radicals may increase due to the formation of a large number of free oxygen radicals or inability of an organism's defense system to cope. These radicals interact with various cellular components and macromolecules and cause metabolic, structural, and functional damage that may lead to cell death. It is thought that cell damage caused by free oxygen radicals contributes to the pathogenesis of several chronic diseases including asthma.
Inflammatory and immune cells, including macrophages, neutrophils, and eosinophils, produce more ROS in asthma patients than in healthy individuals. , Many characteristic traits of asthma occur due to the production of hyper-ROS. Oxygen radicals are known to cause β-receptor dysfunction,  bronchial smooth muscle contraction,  bronchial hypersensitivity, ,, increased mucin secretion, , and a rise in vascular permeability. , Numerous studies suggest that in asthma oxidative stress caused by overproduction of various free radicals or by an insufficient antioxidant defense system contributes to the tissue damage induced by inflammatory cells. ,,,,,,,,
From basic and clinical oxidative stress in asthma
It has been studied with strong evidence that the exogenous and endogenous ROS and reactive nitrogen species (RNS) play a major role in the determination of asthma severity and airway inflammation ,,,, [Figure 1]. According to a recently proposed hierarchical oxidative stress, , a low level of oxidative stress, such as exposure to diesel exhaust products for 6 h at a concentration of 10-50 mg/mL,  leads to the activation of the transcription factor, Nrf2, which encodes more than 200 genes. These gene products are responsible for a wide range of anti-inflammatory, cytoprotective, antioxidant, and detoxification functions and include catalase, heme oxygenase-1, and UGT-1a6.  At low level of oxidative stress, antioxidants can restore cellular redox homeostasis. When high levels of oxidative stimuli are present, additional sets of intracellular signaling cascades are triggered that are potentially pro-inflammatory. These include mitogen-activated protein kinase and nuclear factor-kB, which lead to the expression of inflammatory cytokines, chemokines, and adhesion molecules. A further increase in the level of oxidative stress could ultimately trigger a cytotoxic response originating in the mitochondria and lead to cellular apoptosis or necrosis [Figure 2].
|Figure 2: The hierarchical oxidative stress model. Adapted with permission from Riedl and Nel|
Click here to view
Exposure to endogenous reactive oxygen species and asthma
ROS may be generated by inflammatory cells (such as activated eosinophils, neutrophils, monocytes, and macrophages) and resident cells (such as epithelial and smooth muscle cells). ,, Mitochondrial respiratory chain, the cytosolic xanthine oxidase system, NADPH oxidase-dependent complex are the sources for the production of O 2− . Superoxides (O 2− ) and H 2 O 2 react with each other in the presence of iron and other metal ions and form OH− in biological systems. ,, Eosinophils, neutrophils, and monocytes contain peroxidases that catalyze the interaction between H 2 O 2 and halides leading to the formation of hypohalides such as HOCl. In addition, superoxide anion may also react with NO to form peroxynitrite (ONOO− ), a potent ROS. ,,,,
ROS react with proteins to form carbonyls product, whereas it reacts with nitrogen species and tyrosine to form nitrotyrosine. In murine and human studies, tyrosine nitration was shown to increase after allergen exposure in sensitized mice or atopic asthmatic humans.  ROS also reacts with lipids to liberate isoprostane and ethane. ,, As a result, 8-isoprostane, a biomarker of lipid peroxidation, is elevated in the exhaled breath condensate in adults and children with asthma. Similar to the airways and systemic circulation, urinary levels of bromotyrosine and F2-isoprostanes are elevated in patients with asthma  and are associated with an increased risk of having asthma.
NO is the principal nitrogen species produced in lung. Autoxidation of NO with oxygen results in the formation of nitrite, a substrate for eosinophil peroxidase (EPO) and myeloperoxidase (MPO).  Nitric oxide reacts with superoxide to form ONOO− , which can nitrate tyrosine residues and thus damage enzymes, and structural and functional proteins. ,,, It has been observed that the higher NO levels are associated with higher risk of asthma, prompt asthma severity, and greater response to bronchodilator agents. ,
A link also exists between the increase in ROS and asthma severity. ROS production by neutrophils correlates with the severity of the reactivity of airways.  Increased levels of EPO and MPO correlate with the numbers and activation of eosinophils and neutrophils, respectively. ,, The level of 3-bromotyrosine, a unique product of EPO and eosinophils, was found to be 3 times higher in the bronchoalveolar lavage (BAL) fluid of individuals with asthma compared with that in the control subjects.  In the Intensive Care Unit, the level of 3-bromotyrosine in airways of severe asthma patients was 100-fold higher than that in individuals hospitalized for nonasthma causes.  The 2- to 3-fold elevations in chlorotyrosine are detected from allergen-challenged subsegments in asthmatic subjects [Figure 3]. 
Exposure to exogenous reactive oxygen species and asthma
Large surface area of respiratory system that is in contact with the environment. Airborne pollutants such as sulfur dioxide, nitrogen dioxide, ozone, or cigarette smoke particulate matter in the air can trigger symptoms of asthma.  Recently, a clear relationship between traffic density and asthma exacerbations was demonstrated.  Ultrafine particles with a diameter of 0.1 mm may directly induce mitochondrial damage and make it difficult for the lungs to cope with oxidative stress.  Cigarette smoke is related to asthma exacerbations, especially in young children, rate and severity of asthma are directly related to the extent of exposure to cigarette smoke and rates of asthma.  Cigarette smoke is a mixture of about 4000 chemical compounds distributed in aqueous, gas, and the tar phase of the smoke. The O 2− and nitric oxide of cigarette smoke react to form highly reactive peroxynitrite.  The tar phase of the cigarette smoke contains organic radicals that react with molecular oxygen to form O 2− , OH-, and H 2 O 2 . The tar phase is an effective metal chelator that chelates iron and generates H 2 O 2 continuously. Aqueous phase of the cigarette smoke may undergo redox recycling for a period in the epithelial lining of the lungs. 
Imbalanced oxidant-antioxidant systems in asthma
Homeostasis of cellular functions during oxidative stress depends on the appropriate induction of protective antioxidant mechanisms. Antioxidants are major in vivo and in situ defense mechanisms of the cells against oxidative stress. ,,,, Naturally occurring antioxidants work to protect cells and tissues against the continuous production of ROS and RNS during normal metabolism.  Imbalance of oxidants-antioxidants system of the airway could be a determinant of asthma initiation and severity. ,, Antioxidant system mainly categorized into two groups. Ascorbic acid, glutathione, albumin, alpha-tocopherol, lycopene, and beta-carotene are nonenzymatic oxidants. ,,, The major enzymatic antioxidants of the lungs are SODs, catalase, and glutathione peroxidases as well as heme oxygenase-1, thioredoxins, peroxiredoxins, and glutaredoxins.  Asthma is characterized by the loss of antioxidant activities. Levels of the enzymes glutathione peroxidase and SOD and of the nonenzymatic components of the antioxidant system including reduced glutathione, ascorbic acid, alpha-tocopherol, lycopene, and beta-carotene were significantly lower in children with asthma compared with the healthy controls. Superoxide is the main source of ROS produced from so many sources, its dismutation by SOD is done about each and every cell. 
Catalase is a metalloprotein enzyme and the main scavenger of H 2 O 2 . It is effective in high concentrations of H 2 O 2 . Under prolonged oxidative stress, NADPH binds to the enzyme and stabilizes the structure and protects catalase from inactivation. This leads to the decrease in catalase activity.  Both animal and human studies have shown that catalase activity in BAL fluid is lower in patients with asthma as compared with that in healthy controls.  Extracellular glutathione peroxidase is higher than normal in the lungs of patients with asthma.
Enhanced oxidant-antioxidant imbalance in the airway
An increase in air pollution, an increased use of oxidant medication, and a decreased intake of antioxidants account for increased airway oxidative stress, which can cause immunity and airway inflammation.
Another explanation for the recent increase in the development of asthma may be associated with individual variations in the cellular machineries that handle intracellular antioxidants. A partial deficiency in the intracellular antioxidant defense system may critically affect oxidants when the level of increased oxidative stress goes beyond the capability of the system. ,,, Increased oxidative stress in the environment may contribute to allergic airway inflammation by inducing a break in immune tolerance in genetically predisposed individuals whose antioxidant systems are unable to handle the oxidative stress burden imposed on immune cells. The association between oxidative stress and the development of airway inflammation is depicted in [Figure 4]. It is assumed that a higher severity of asthma is also closely related to a lower ability to control oxidative stress in genetically predisposed patients. 
|Figure 4: Results of properly controlled oxidative stress and consequences of inadequately controlled intracellular oxidative stress in the pathogenesis of asthma|
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Therefore, intrinsic defects in certain intracellular molecules involved in the processes of intracellular oxidative stress signaling may be a plausible molecular mechanism explaining the crucial and direct role of oxidative stress in the pathogenesis of bronchial asthma, especially the chronic, severe asthma phenotype. Even genetic polymorphism leads to pathophysiological changes that result in the inflammation of the airways.
Role of vitamins and nutrients in asthma
The results of the studies evaluating the effects of vitamins and nutrients on asthma have been controversial. ,,,,,, In a murine study, it was shown that the administration of Vitamins C and E caused decreases in ragweed extract-induced ROS levels and is associated with lower airway allergic inflammation.  In an ovalbumin-sensitized rat model, 4 days of oral treatment with gamma-tocopherol diminished eosinophil infiltration in the nose, sinuses, and nasolacrimal duct but not in the lung after allergen challenge. 
Even though epidemiological studies have suggested that children with low dietary intake of Vitamins C and E, and other antioxidants have in general more symptoms, , the results of the clinical studies have been largely disappointing. ,, Interestingly, a recent study has even suggested that vitamin supplements may increase the oxidant stress. This emphasizes that exogenous antioxidants need to block the oxidant pathways without suppressing the endogenous antioxidant mechanisms.
Vitamin D: Role in lung immunomodulation
Vitamin D is produced by the conversion of proVitamin D to preVitamin D in the skin during exposure to sunlight. Some Vitamin D comes from food sources. PreVitamin D is converted in the liver to 25-hydroxyl Vitamin D. The active form of Vitamin D is 1,25-dihydroxy Vitamin D (1,25(OH) 2 D 3 ) which is generated primarily in the kidneys.  1,25(OH) 2 D 3 binds to cell membrane Vitamin D receptors and forms a complex that is then internalized. Vitamin D receptors form part of the steroid hormone nuclear receptor complex. This complex binds to the Vitamin D promoter region of the Vitamin D responsive genes that influence the rate of RNA polymerase II-mediated transcription.
The serum 25-hydroxyvitamin D level is the best indicator of overall Vitamin D status. Skin-derived Vitamin D is variable and depends on pigmentation, latitude, season, clothing, age, sunscreen use, and local weather patterns. The enzyme, 1α-hydroxylase, is present and expressed in airway epithelium (in significant quantities) and a host of lung constitutive and inflammatory cells including alveolar macrophages, dendritic cells, and lymphocytes.  Vitamin D3 has various specific effects on different immune cells. 1,25(OH)2 D3 promotes apoptosis and inhibits maturation of bone-marrow-derived mast cell precursors. There was also a dose-dependent inhibition of mast cell differentiation by 1,25(OH)2 D3 at various stages of mast cell development. 
Vitamin D plays a role in B-cell functioning by the inhibition of plasma cell differentiation and immunoglobulin secretion (IgG and IgM), memory B-cell generation, and apoptosis of activated B cells. These mechanisms may contribute to the pathogenesis of B-lymphocyte-related diseases such as asthma.  Vitamin D inhibits proliferation of Th-lymphocytes. The effect of cholecalciferol on Th-mediated cytokines is variable, enhancing and suppressing secretion under different circumstances. The main effect of Vitamin D on cell-mediated immunity occurs indirectly through alteration of antigen-presenting cells, especially dendritic cells. Vitamin D is an important regulator of lymphocyte trafficking and homing, to sites of inflammation. ,
The Vitamin D receptor was found to be present in bronchial smooth muscle cells which are associated with active protein synthesis. 1,25(OH)2 D3 arrests the progression of airway smooth muscle cells in the S phase of the cell cycle. It is believed that matrix metalloproteinases 9 and 33 also has a role in airway remodeling, along with the aspect of airway remodeling in angiogenesis.  All these effects operating at a cellular level could be advantageous to protection against infection and the development of allergic lung diseases such as asthma. ,
Vitamin D has effects on the innate and adaptive immune system. In asthmatic children, low Vitamin D levels are associated with poor asthma control, reduced lung function, increased medication intake, and exacerbations. Vitamin D insufficiency is increasingly recognized in the general population and has been largely attributed to dietary, lifestyle, and behavioral changes. , Vitamin D might be relevant in the primary prevention of asthma, in the protection against or reduction of asthma morbidity, and in the modulation of the severity of asthma exacerbations. ,,
| Discussion|| |
Bronchial asthma is an inflammatory disease characterized by activation and accumulation of inflammatory cells in the airway. This inflammation may cause tissue damage, resulting in the pathological manifestations of disease including airflow obstruction, airway hyperresponsiveness, and permanent structural changes that include airway remodeling. Asthma is associated with strong oxidative stress that is result of both increased oxidant forces and decreased antioxidant capacity. Various bioactive mediators, factors, and cytokines are involved in the pathogenesis of asthma. ROS and RNS also have negative effects in pulmonary system that result in the tissue damage associated with asthma. It is well known that oxidative stress (imbalance in oxidant-antioxidant) is an important component in airway inflammation.
As in other inflammatory conditions, oxidative burst in asthma is nonspecific event in which numerous inflammatory processes are simultaneously activated. Asthma mediators, such as lipid mediators, chemokines, adhesion molecules, and eosinophil granulocytes, are potential stimulators of oxidant production and increase ROS and RNS production. The lung possesses an advanced antioxidant system that functions to protect from exposure to harmful oxidants; however, the oxidant-antioxidant imbalance occurs in asthma. Researchers are more interested to use antioxidants agents such as Vitamins A, C, D, and E to improve clinical and pulmonary function in asthmatic patients. These agents can decrease or prevent oxidant toxicity or respiratory systems.
| Conclusion|| |
The oxidative stress can be critical contributor to asthma development and can initiate various intracellular signaling pathways that lead to break in immune tolerance and exaggerated allergic inflammation. Authors speculate that combination of antioxidant agents and Vitamin D (lung immunomodulator) supplementation may in the future, prove to be beneficial in the treatment of asthma, as adjuncts to current pharmacological strategies.
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Conflicts of interest
There are no conflicts of interest.
| References|| |
Chytil F. The lungs and Vitamin A. Am J Physiol 1992;262(5 Pt 1):L517-27.
Hu G, Cassano PA. Antioxidant nutrients and pulmonary function: The Third National Health and Nutrition Examination Survey (NHANES III). Am J Epidemiol 2000;151:975-81.
McKeever TM, Scrivener S, Broadfield E, Jones Z, Britton J, Lewis SA. Prospective study of diet and decline in lung function in a general population. Am J Respir Crit Care Med 2002;165:1299-303.
Dweik RA, Comhair SA, Gaston B, Thunnissen FB, Farver C, Thomassen MJ, et al.
NO chemical events in the human airway during the immediate and late antigen-induced asthmatic response. Proc Natl Acad Sci U S A 2001;98:2622-7.
Gaston B, Drazen JM, Loscalzo J, Stamler JS. The biology of nitrogen oxides in the airways. Am J Respir Crit Care Med 1994;149(2 Pt 1):538-51.
Haahtela T. Airway remodelling takes place in asthma - What are the clinical implications? Clin Exp Allergy 1997;27:351-3.
Calhoun WJ, Reed HE, Moest DR, Stevens CA. Enhanced superoxide production by alveolar macrophages and air-space cells, airway inflammation, and alveolar macrophage density changes after segmental antigen bronchoprovocation in allergic subjects. Am Rev Respir Dis 1992;145(2 Pt 1):317-25.
Comhair SA, Bhathena PR, Dweik RA, Kavuru M, Erzurum SC. Rapid loss of superoxide dismutase activity during antigen-induced asthmatic response. Lancet 2000;355:624.
Li N, Hao M, Phalen RF, Hinds WC, Nel AE. Particulate air pollutants and asthma. A paradigm for the role of oxidative stress in PM-induced adverse health effects. Clin Immunol 2003;109:250-65.
Riedl MA, Nel AE. Importance of oxidative stress in the pathogenesis and treatment of asthma. Curr Opin Allergy Clin Immunol 2008;8:49-56.
Li N, Alam J, Venkatesan MI, Eiguren-Fernandez A, Schmitz D, Di Stefano E, et al.
Nrf2 is a key transcription factor that regulates antioxidant defense in macrophages and epithelial cells: Protecting against the proinflammatory and oxidizing effects of diesel exhaust chemicals. J Immunol 2004;173:3467-81.
Cho HY, Jedlicka AE, Reddy SP, Kensler TW, Yamamoto M, Zhang LY, et al.
Role of NRF2 in protection against hyperoxic lung injury in mice. Am J Respir Cell Mol Biol 2002;26:175-82.
Ramos CL, Pou S, Britigan BE, Cohen MS, Rosen GM. Spin trapping evidence for myeloperoxidase-dependent hydroxyl radical formation by human neutrophils and monocytes. J Biol Chem 1992;267:8307-12.
Kharitonov SA, Yates D, Robbins RA, Logan-Sinclair R, Shinebourne EA, Barnes PJ. Increased nitric oxide in exhaled air of asthmatic patients. Lancet 1994;343:133-5.
Bascom R, Bromberg PA, Costa DA. Health effects of outdoor air pollution. Part I. State of the art. Am J Respir Crit Care Med 1996;153:3-50.
Halliwell B. Reactive oxygen species in living systems: Source, biochemistry, and role in human disease. Am J Med 1991;91:14S-22S.
Green RJ. Diagnostic testing in allergy. In: Green RJ, Motala C, Potter PC, eds. Handbook of Practical Allergy. 3 rd
ed. Cape Town: Oxford University Press; 2010. p. 7-12.
Green RJ. Paediatric Asthma in Southern Africa. The Open Allergy Journal 2011;4:8-15.
Reiter RJ. Oxidative processes and antioxidative defense mechanisms in the aging brain. FASEB J 1995;9:526-33.
Henricks PA, Nijkamp FP. Reactive oxygen species as mediators in asthma. Pulm Pharmacol Ther 2001;14:409-20.
Rahman I, Biswas SK, Kode A. Oxidant and antioxidant balance in the airways and airway diseases. Eur J Pharmacol 2006;533:222-39.
Ciencewicki J, Trivedi S, Kleeberger SR. Oxidants and the pathogenesis of lung diseases. J Allergy Clin Immunol 2008;122:456-68.
Nadeem A, Chhabra SK, Masood A, Raj HG. Increased oxidative stress and altered levels of antioxidants in asthma. J Allergy Clin Immunol 2003;111:72-8.
Fujisawa T. Role of oxygen radicals on bronchial asthma. Curr Drug Targets Inflamm Allergy 2005;4:505-9.
Andreadis AA, Hazen SL, Comhair SA, Erzurum SC. Oxidative and nitrosative events in asthma. Free Radic Biol Med 2003;35:213-25.
Caramori G, Papi A. Oxidants and asthma. Thorax 2004;59:170-3.
Kirkham P, Rahman I. Oxidative stress in asthma and COPD: Antioxidants as a therapeutic strategy. Pharmacol Ther 2006;111:476-94.
Ricciardolo FL, Di Stefano A, Sabatini F, Folkerts G. Reactive nitrogen species in the respiratory tract. Eur J Pharmacol 2006;533:240-52.
Comhair SA, Erzurum SC. Antioxidant responses to oxidant-mediated lung diseases. Am J Physiol Lung Cell Mol Physiol 2002;283:L246-55.
Barnes PJ. Reactive oxygen species and airway inflammation. Free Radic Biol Med 1990;9:235-43.
Dworski R. Oxidant stress in asthma. Thorax 2000;55 Suppl 2:S51-3.
Bowler RP. Oxidative stress in the pathogenesis of asthma. Curr Allergy Asthma Rep 2004;4:116-22.
Mak JC, Chan-Yeung MM. Reactive oxidant species in asthma. Curr Opin Pulm Med 2006;12:7-11.
Iijima H, Duguet A, Eum SY, Hamid Q, Eidelman DH. Nitric oxide and protein nitration are eosinophil dependent in allergen-challenged mice. Am J Respir Crit Care Med 2001;163:1233-40.
Hanazawa T, Kharitonov SA, Barnes PJ. Increased nitrotyrosine in exhaled breath condensate of patients with asthma. Am J Respir Crit Care Med 2000;162(4 Pt 1):1273-6.
Dworski R, Roberts LJ 2 nd
, Murray JJ, Morrow JD, Hartert TV, Sheller JR. Assessment of oxidant stress in allergic asthma by measurement of the major urinary metabolite of F2-isoprostane, 15-F2t-IsoP (8-iso-PGF2alpha). Clin Exp Allergy 2001;31:387-90.
Paredi P, Kharitonov SA, Barnes PJ. Elevation of exhaled ethane concentration in asthma. Am J Respir Crit Care Med 2000;162 (4 Pt 1):1450-4.
Wedes SH, Khatri SB, Zhang R, Wu W, Comhair SA, Wenzel S, et al.
Noninvasive markers of airway inflammation in asthma. Clin Transl Sci 2009;2:112-7.
Abu-Soud HM, Hazen SL. Nitric oxide is a physiological substrate for mammalian peroxidases. J Biol Chem 2000;275:37524-32.
Sanders SP. Nitric oxide in asthma. Pathogenic, therapeutic, or diagnostic? Am J Respir Cell Mol Biol 1999;21:147-9.
Sanders SP, Zweier JL, Harrison SJ, Trush MA, Rembish SJ, Liu MC. Spontaneous oxygen radical production at sites of antigen challenge in allergic subjects. Am J Respir Crit Care Med 1995;151:1725-33.
Carlson MG, Peterson CG, Venge P. Human eosinophil peroxidase: Purification and characterization. J Immunol 1985;134:1875-9.
Cramer R, Soranzo MR, Patriarca P. Evidence that eosinophils catalyze the bromide-dependent decarboxylation of amino acids. Blood 1981;58:1112-8.
Jatakanon A, Uasuf C, Maziak W, Lim S, Chung KF, Barnes PJ. Neutrophilic inflammation in severe persistent asthma. Am J Respir Crit Care Med 1999;160(5 Pt 1):1532-9.
Wu W, Samoszuk MK, Comhair SA, Thomassen MJ, Farver CF, Dweik RA, et al.
Eosinophils generate brominating oxidants in allergen-induced asthma. J Clin Invest 2000;105:1455-63.
MacPherson JC, Comhair SA, Erzurum SC, Klein DF, Lipscomb MF, Kavuru MS, et al.
Eosinophils are a major source of nitric oxide-derived oxidants in severe asthma: Characterization of pathways available to eosinophils for generating reactive nitrogen species. J Immunol 2001;166:5763-72.
Liu L, Poon R, Chen L, Frescura AM, Montuschi P, Ciabattoni G, et al.
Acute effects of air pollution on pulmonary function, airway inflammation, and oxidative stress in asthmatic children. Environ Health Perspect 2009;117:668-74.
Migliore E, Berti G, Galassi C, Pearce N, Forastiere F, Calabrese R, et al.
Respiratory symptoms in children living near busy roads and their relationship to vehicular traffic: Results of an Italian multicenter study (SIDRIA 2). Environ Health 2009;8:27.
Li N, Sioutas C, Cho A, Schmitz D, Misra C, Sempf J, et al.
Ultrafine particulate pollutants induce oxidative stress and mitochondrial damage. Environ Health Perspect 2003;111:455-60.
Gilmour MI, Jaakkola MS, London SJ, Nel AE, Rogers CA. How exposure to environmental tobacco smoke, outdoor air pollutants, and increased pollen burdens influences the incidence of asthma. Environ Health Perspect 2006;114:627-33.
Church DF, Pryor WA. Free-radical chemistry of cigarette smoke and its toxicological implications. Environ Health Perspect 1985;64:111-26.
Nakayama T, Church DF, Pryor WA. Quantitative analysis of the hydrogen peroxide formed in aqueous cigarette tar extracts. Free Radic Biol Med 1989;7:9-15.
Heffner JE, Repine JE. Pulmonary strategies of antioxidant defense. Am Rev Respir Dis 1989;140:531-54.
McFadden SL, Woo JM, Michalak N, Ding D. Dietary vitamin C supplementation reduces noise-induced hearing loss in guinea pigs. Hear Res 2005;202:200-8.
Rock CL, Rodriguez JL, Khilnani R, Lown DA, Parker RS. Carotenoids and antioxidant nutrients following burn injury. Ann N Y Acad Sci 1993;691:274-6.
Comhair SA, Erzurum SC. Redox control of asthma: Molecular mechanisms and therapeutic opportunities. Antioxid Redox Signal 2010;12:93-124.
Kirkman HN, Rolfo M, Ferraris AM, Gaetani GF. Mechanisms of protection of catalase by NADPH. Kinetics and stoichiometry. J Biol Chem 1999;274:13908-14.
Ghosh S, Masri F, Comhair S, Andreadis A, Swaidani S. Nitration of proteins in murine model of asthma. Am J Respir Crit Care Med 2003;167:A889.
Yang IA, Fong KM, Zimmerman PV, Holgate ST, Holloway JW. Genetic susceptibility to the respiratory effects of air pollution. Thorax 2008;63:555-63.
Romieu I, Sienra-Monge JJ, Ramírez-Aguilar M, Moreno-Macías H, Reyes-Ruiz NI, Estela del Río-Navarro B, et al.
Genetic polymorphism of GSTM1 and antioxidant supplementation influence lung function in relation to ozone exposure in asthmatic children in Mexico City. Thorax 2004;59:8-10.
Li YF, Gauderman WJ, Avol E, Dubeau L, Gilliland FD. Associations of tumor necrosis factor G-308A with childhood asthma and wheezing. Am J Respir Crit Care Med 2006;173:970-6.
Tamer L, Calikoglu M, Ates NA, Yildirim H, Ercan B, Saritas E, et al.
Glutathione-S-transferase gene polymorphisms (GSTT1, GSTM1, GSTP1) as increased risk factors for asthma. Respirology 2004;9:493-8.
Dharajiya N, Choudhury BK, Bacsi A, Boldogh I, Alam R, Sur S. Inhibiting pollen reduced nicotinamide adenine dinucleotide phosphate oxidase-induced signal by intrapulmonary administration of antioxidants blocks allergic airway inflammation. J Allergy Clin Immunol 2007;119:646-53.
Wagner JG, Jiang Q, Harkema JR, Ames BN, Illek B, Roubey RA, et al.
Gamma-tocopherol prevents airway eosinophilia and mucous cell hyperplasia in experimentally induced allergic rhinitis and asthma. Clin Exp Allergy 2008;38:501-11.
Mehta AK, Arora N, Gaur SN, Singh BP. Choline supplementation reduces oxidative stress in mouse model of allergic airway disease. Eur J Clin Invest 2009;39:934-41.
Burns JS, Dockery DW, Neas LM, Schwartz J, Coull BA, Raizenne M, et al.
Low dietary nutrient intakes and respiratory health in adolescents. Chest 2007;132:238-45.
Riccioni G, Barbara M, Bucciarelli T, di Ilio C, D'Orazio N. Antioxidant vitamin supplementation in asthma. Ann Clin Lab Sci 2007;37:96-101.
Fogarty A, Lewis SA, Scrivener SL, Antoniak M, Pacey S, Pringle M, et al.
Oral magnesium and vitamin C supplements in asthma: A parallel group randomized placebo-controlled trial. Clin Exp Allergy 2003;33:1355-9.
Pearson PJ, Lewis SA, Britton J, Fogarty A. Vitamin E supplements in asthma: A parallel group randomised placebo controlled trial. Thorax 2004;59:652-6.
Ristow M, Zarse K, Oberbach A, Klöting N, Birringer M, Kiehntopf M, et al.
Antioxidants prevent health-promoting effects of physical exercise in humans. Proc Natl Acad Sci U S A 2009;106:8665-70.
Rosen CJ. Clinical practice. Vitamin D insufficiency. N Engl J Med 2011;364:248-54.
Hansdottir S, Monick MM, Hinde SL, Lovan N, Look DC, Hunninghake GW. Respiratory epithelial cells convert inactive Vitamin D to its active form: Potential effects on host defense. J Immunol 2008;181:7090-9.
Baroni E, Biffi M, Benigni F, Monno A, Carlucci D, Carmeliet G, et al.
VDR-dependent regulation of mast cell maturation mediated by 1,25-dihydroxyvitamin D3. J Leukoc Biol 2007;81:250-62.
Chen S, Sims GP, Chen XX, Gu YY, Chen S, Lipsky PE. Modulatory effects of 1,25-dihydroxyvitamin D3 on human B cell differentiation. J Immunol 2007;179:1634-47.
Topilski I, Flaishon L, Naveh Y, Harmelin A, Levo Y, Shachar I. The anti-inflammatory effects of 1,25-dihydroxyvitamin D3 on Th2 cells in vivo
are due in part to the control of integrin-mediated T lymphocyte homing. Eur J Immunol 2004;34:1068-76.
Luster AD, Tager AM. T-cell trafficking in asthma: Lipid mediators grease the way. Nat Rev Immunol 2004;4:711-24.
Bossé Y, Maghni K, Hudson TJ. 1alpha, 25-dihydroxy-vitamin D3 stimulation of bronchial smooth muscle cells induces autocrine, contractility, and remodeling processes. Physiol Genomics 2007;29:161-8.
Sandhu MS, Casale TB. The role of Vitamin D in asthma. Ann Allergy Asthma Immunol 2010;105:191-9.
Hansdottir S, Monick MM. Vitamin D effects on lung immunity and respiratory diseases. Vitam Horm 2011;86:217-37.
Holick MF. Vitamin D deficiency. N Engl J Med 2007;357:266-81.
Paul G, Brehm JM, Alcorn JF, Holguín F, Aujla SJ, Celedón JC. Vitamin D and asthma. Am J Respir Crit Care Med 2012;185:124-32.
Brehm JM, Schuemann B, Fuhlbrigge AL, Hollis BW, Strunk RC, Zeiger RS, et al.
Serum Vitamin D levels and severe asthma exacerbations in the Childhood Asthma Management Program study. J Allergy Clin Immunol 2010;126:52-8.e5.
Goleva E, Searing DA, Jackson LP, Richers BN, Leung DY. Steroid requirements and immune associations with Vitamin D are stronger in children than adults with asthma. J Allergy Clin Immunol 2012;129:1243-51.
[Figure 1], [Figure 2], [Figure 3], [Figure 4]