title: Altered oxidant-antioxidant levels in the disease prognosis of chronic obstructive pulmonary disease.
abstract: BACKGROUND
  It is well known that oxidant-antioxidant imbalance plays a key role in the pathophysiology of chronic obstructive pulmonary disease (COPD).
  
  
  OBJECTIVE
  To examine the role of altered levels of oxidant-antioxidants in disease severity of COPD and correlate it with the degree of airflow obstruction.
  
  
  METHODS
  We assessed malondialdehyde (MDA), total protein carbonyl and sulfhydryl levels in blood plasma and examined the activity of superoxide dismutase (SOD), catalase and glutathione peroxidase (GPx) in erythrocytes. We also evaluated the level of total blood glutathione in whole blood and ferric ion reducing antioxidant power (FRAP) in plasma.
  
  
  RESULTS
  Levels of MDA (P < 0.001) and total protein carbonyls (P < 0.01) were significantly increased, while total protein sulfhydryl (P < 0.01) was decreased in COPD patients. We also observed decreased SOD (P < 0.05), GPx (P < 0.01) and catalase (P < 0.05) activity. FRAP (P < 0.001) in plasma was also decreased, whereas total blood glutathione was increased (P < 0.01). Correlations between oxidative stress and antioxidant markers with forced expiratory volume in 1 second (FEV1%) in COPD were negative with plasma TBARS and total blood glutathione, whereas a positive correlation was noticed with erythrocyte GPx and FRAP.
  
  
  CONCLUSIONS
  These results support the hypothesis that an oxidant-antioxidant imbalance, associated with oxidative stress in COPD patients, plays an important role in the progression of disease severity.
authors.affiliation: Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India. qayyumbiochem@gmail.com
authors.forename: A
authors.initials: A
authors.lastname: Ahmad
authors.forename: M
authors.initials: M
authors.lastname: Shameem
authors.forename: Q
authors.initials: Q
authors.lastname: Husain
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000378:metabolism*; D016022:Case-Control Studies; D002374:Catalase / Q000378:metabolism; D018450:Disease Progression; D005260:Female; D005541:Forced Expiratory Volume; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D008875:Middle Aged; D016877:Oxidants / Q000378:metabolism*; D018384:Oxidative Stress; D011379:Prognosis; D050050:Protein Carbonylation; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012720:Severity of Illness Index; D013438:Sulfhydryl Compounds / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D016877:Oxidants; D013438:Sulfhydryl Compounds; D008315:Malondialdehyde; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase