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    Epicardial fat thickness is associated with oxidative stress index in cardiac syndrome X
    (İnönü Üniversitesi, 2020) Özbiçer, Süleyman; Kalkan, Gülhan; Gür, Mustafa; Topuz, Mustafa; Kaypaklı, Onur; Koç, Mevlüt; Erel, Özcan
    AbstractAim: We aimed to investigate the relationship between oxidative parameters- total oxidant status (TOS), total antioxidant capacity (TAC), and oxidative stress index (OSI)- and EFT in patients with CSX. Without clinically significant coronary artery disease, cardiac syndrome X (CSX) is characterized by cardiac ischemia, and chest pain. However, there is some evidence about increased oxidative stress in CSX patients; the relationship between oxidative stress parameters and epicardial fat thickness (EFT) is not well established in this population.Material and Methods: : One hundred and twenty-two patients with normal coronary arteries (73 female, 49 males, mean age 56.71 ± 10.69 years) were enrolled in the study. The study population was divided into two groups according to their OSI. Oxidative stress index below the median was defined as the OSI low group and equal or higher than the median was defined as the OSI high group.Results: EFT was higher in the high OSI group than the low OSI group (6 (3.9 – 8.9) vs. 5.4 (0.56 – 7.2), p= 0.032). In bivariate correlation analysis EFT was positively correlated with OSI and TOS (r=0.242, p=0.036 and r=0.234, p=0.025 respectively). In binary logistic regression analysis, EFT was found to be an independent predictor of OSI.Conclusion: : In our study, EFT was independently associated with OSI in CSX patients. This finding suggests that EFT may be a marker of increased oxidative stress in CSX.
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    Evaluation of dynamic thiol-disulfide balance and ischemia modified albumin levels in patients with chronic kidney disease
    (2022) Erdal, Hüseyin; Özcan, Oğuzhan; Turgut, Faruk Hilmi; Neselioglu, Salim; Erel, Özcan
    Objective: In this study, it was aimed to determine the dynamic thiol-disulfide balance and ischemia modified albumin (IMA) levels in patients with chronic kidney disease (CKD). Method: Thirty hemodialysis (HD), 30 CKD patients (stage 3-5) and 30 controls were included in the study. The dynamic thiol-disulfide balance was determined by the colorimetric method developed by Erel et al. IMA levels were determined by using cobalt binding test developed by Bar- Or et al. Results: Native and total thiol levels of CKD and HD patients were significantly lower than that of the control group (p=0.001 for both). However, disulfide levels were significantly higher in the HD group (p=0.001), but there was no significant difference between control and CKD groups(p=0.547). A statistically significant negative correlation was found between the native and total thiol levels and IMA (r=-0.628; -0.631), BUN (r=-0.747; -0.747), and creatinine (r=-0.732; -0.721). There was a significant positive correlation between GFR and the thiol levels (r=0.835;0.824). TrxR levels were significantly higher in the patient groups compared to the controls (p=0.001). CRP levels of the patient groups were significantly higher compared to the controls (p=0.001). Conclusion: We have demonstrated that measurement of dynamic thiol-disulfide levels by using colorimetric method can contribute to the diagnosis and follow-up of the disease as a marker, because it is easily applicable in routine clinical biochemistry laboratories and related with disease severity in CKD patients. Also, we showed that albumin correction due to dialysis process should be consider in studies dealing with plasma thiol values and the final results should be given after the correction process.
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    Plasma ischemia-modified albumin levels and dynamic thiol/ disulfide balance in sickle cell disease : a case-control study
    (2018) Özcan, Oğuzhan; Erdal, Hüseyin; İlhan, Gül; Demir, Damla; Gürpınar, Ahmet Burak; Neşelioğlu, Salim; Erel, Özcan
    Objective: Sickle cell disease (SCD), described as a group of inherited blood disorders, affects millions of people throughout the world and is particularly common in the southern part of Turkey. We aimed to determine the relationship between ischemia-modified albumin (IMA) and the dynamic thiol/disulfide balance in SCD. Materials and Methods: Fifty-four adult SCD patients and 30 healthy controls were included in the study. The 54 adult patients included 30 (56%) males and 24 (44%) females with a mean age of 28.3±8.4 years (minimum-maximum: 18-46 years). Of the 54 patients, 46 had homozygous sickle cell anemia (HbSS) and 8 had sickle/?-thalassemia (HbS/?+-thalassemia). Fasting blood samples were collected. After centrifugation at 1500×g for 10 min, plasma samples were portioned and stored at -80 °C. IMA levels were determined by albumin cobalt binding test, a colorimetric method. Total and native thiols and disulfide were analyzed with a novel spectrophotometric method. Results: We found significantly lower levels of native thiol (-SH) (284.0±86.3 µmol/L), disulfide levels (14.6±7 µmol/L), and total thiols (-SH + -S-S-) (313.0±89.3 µmol/L) in SCD patients compared to healthy controls (respectively 417.0±54.2, 22.7±11.3, and 462.0±58.7 µmol/L). Plasma albumin levels (34.9±7.9 g/L) were lower and IMA levels (13.6±3.1 g/L) were higher in SCD patients compared to controls (respectively 43.5±3.1 and 8.4±1.6 g/L). Plasma albumin levels were strongly correlated with both plasma native (r=0.853; p=0.0001) and total thiols (r=0.866; p=0.0001). Conclusion: Decreased plasma native and total thiol levels and increased IMA levels are related to increased oxidative stress and provide an indirect and quick reflection of the oxidative damage in SCD patients.