Abstract
This study was aimed to evaluate the oxidant–antioxidant imbalance in the pathogenesis of chronic obstructive pulmonary disease (COPD) in Tunisians. We assessed 16 parameters related to the oxidative status that include malondialdehyde (MDA), total protein carbonyls (PCs), and advanced oxidation protein products (AOPP). We also examined the activity of glutathione peroxydase (GSH-Px), catalase, and superoxide dismutase (SOD) in the plasma and erythrocytes. Levels of total thiols, reduced glutathione (GSH), total antioxidant status (TAS), hydrogen peroxide, ascorbic acid, iron, and protein sulfhydryls were determined using spectrophotometry. We also evaluated the level of nitric oxide (NO) and peroxynitrite in plasma from COPD patients and healthy controls. Estimation of DNA damage was determined using the comet assay. Pulmonary functional tests were performed by body plethysmography. Levels of MDA, PC, DNA damage, and AOPP were significantly increased while total thiols, GSH, and TAS were decreased in COPD patients. GSH-Px activity was higher in COPD patients while no difference was found for catalase and SOD. We also observed a lower level of NO and peroxynitrite in COPD patients. Decreased levels of peroxynitrite were found to correlate with disease progression, as well as with forced expiratory volume in 1 s/forced vital capacity among COPD patients. Multivariate analysis revealed that NO is associated with pathological pathways that help to predict patient outcome independently of the degree of airflow obstruction. These results indicate the presence of a systemic oxidative stress and highlight the importance of NO and peroxynitrite as major effectors in COPD development and airflow obstruction.
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Abbreviations
- AOPP:
-
Advanced oxidation protein products
- BMI:
-
Body mass index
- CAT:
-
Catalase
- COPD:
-
Chronic obstructive pulmonary disease
- FEV1%:
-
Forced expiratory volume in 1 s (%predicted)
- FVC:
-
Forced vital capacity
- GOLD:
-
Global Initiative for Chronic Obstructive Lung Disease
- GSH:
-
Glutathione
- GSH-Px:
-
Glutathione peroxydase
- MDA:
-
Malondialdehyde
- NO:
-
Nitric oxide
- PC:
-
Protein carbonyls
- RNS:
-
Reactive nitrogen species
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- TAS:
-
Total antioxidant status
- TBA:
-
Thiobarbituric acid
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Acknowledgments
This work was supported by the Ministry of Higher Education and Scientific Research and by the Ministry of Public Health of the Tunisian Government. We would like to thank Pr Saloua Abid (Laboratory of Research on Biologically Compatible Compounds, Faculty of Dentistry, Monastir University, Tunisia) and Dr Ghada ben Salah (Laboratory of Human Molecular Genetics, Faculty of Médicine, Sfax, Tunisia) for their help in the realization of the comet test.
Conflict of interest
The authors declare that they have no competing interests.
Author’s contributions
BAA (PhD) carried out the different experiments and drafted the manuscript; FH (Associate Professor), BNH (Assistant, PhD), CE (MD, PhD), BS (thesis student), and CH (thesis student) participated in the measurement of the different parameters related to the oxidant–antioxidant status; YS (MD, Professor), GA (MD, Professor), BM (MD, Professor), and TZ (MD, PhD, Professor) participated in the design of the study and coordination and helped to draft the manuscript; CK (PhD, Professor) participated in the different experiments, in the design of the study and to draft the manuscript. All authors read and approved the final manuscript.
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Summary at a Glance: This study provides a strong evidence for altered oxidant–antioxidant balance in the plasma from Tunisian patients with COPD. Our findings also point out the relevance of nitric oxide and peroxynitrite as major effectors in COPD development and airflow obstruction.
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ben Anes, A., Fetoui, H., Bchir, S. et al. Increased Oxidative Stress and Altered Levels of Nitric Oxide and Peroxynitrite in Tunisian Patients with Chronic Obstructive Pulmonary Disease: Correlation with Disease Severity and Airflow Obstruction. Biol Trace Elem Res 161, 20–31 (2014). https://doi.org/10.1007/s12011-014-0087-4
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DOI: https://doi.org/10.1007/s12011-014-0087-4