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    Comparison of the antioxydant enzyme levels with the degree of dysfunction in patients with myocardial dysfunction
    (2004) Sezgin N.; Sezgin A.T.; Karabulut A.; Topal E.; Barutçu I.; Gözükara E.M.
    Objective: Myocardial dysfunction in patients with cardiomyopathy is proposed to occur due to membrane changes caused by oxidative stress. In our study we evaluate whether there is any relation between the degree of myocardial dysfunction and antioxicant enzymes. Methods: We studied superoxide dismutase (SOD), glutathione peroxidase (GSHPx) and catalase (CAT) enzyme activities from blood samples of 60 patients (30 patients had ejection fraction (EF) <%35 and 30 patients had EF= %35-50) who have myocardial dysfunction according to clinical findings and two dimensional echocardiography, and 20 healthy volunteers. Results: We found erythrocyte SOD enzyme activities of patients with EF <%35 (group 3) were significantly lower than in control subjects (group 1) (p=0.01). However in group 2 patients (EF=%35-50), erythrocyte SOD activities were found to be lower than in control subjects but this difference was not significant. Erythrocte CAT and GSHPx enzyme activities of group 3 were also significantly lower than in control group (p=0.04 and p=0.02 respectively). Conclusion: In conclusion, reactive oxygen species play a significant role in the initiation and the progression of congestive heart failure. Increased free radicals levels may cause myocardial muscle dysfunction.
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    Investigation of the blood biochemical status of gas station workers
    (2006) Bayraktar N.M.; Karagözler A.A.; Bayraktar M.; Titretir S.; Gözükara E.M.
    The aim of this study was to examine occupation-associated effects on blood cytokine and immunoglobulin g (IgG) levels, antioxidant enzyme activities (SOD, GSHPx, and catalase), nitrite and nitrate levels, and malondialdehyde (MDA) concentrations in gas station workers (GSWs). Trace elements (Cu, Zn, and Pb) in serum, and the amount of hemoglobin in erythrocytes were also determined. Forty male GSWs and 30 male controls were included in the study. No significant difference was observed between the hemoglobin levels of GSWs and those in controls. Proinflammatory cytokine levels, such as tumor necrosis factor-? and interleukin-8 were significantly increased in GSWs' sera. Interleukin-1? and interleukin-6 were below the detection limit of the assay in both the groups. Cytokine receptor interleukin 2R concentration and IgG levels were also significantly increased. Approximately, two-fold increase in nitrite and nitrate concentrations was found in GSWs' sera. Erythrocyte antioxidant enzyme levels were significantly lower in GSWs' blood. MDA concentration, a measure of lipid peroxidation, was found to be significantly elevated. Zn levels were significantly decreased, whereas Cu and Pb levels were increased in GSWs' sera. Smoking was not found to be a major confounder for the association between exposure and blood parameters. © 2006 Taylor & Francis.