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    Alterations in serum thiol-disulfiide homeostasis and ischemiamodifiied albumin concentrations in clinical canine parvoviral enteritis
    (Tubitak Scientific & Technological Research Council Turkey, 2024) Şenel, Yasin; Terzi, Osman Safa; Kara, Erdal; Erel, Özcan; Neşelioğlu, Salim; Ceylan, Ebubekir
    Monitoring biomarkers related to inflammation and oxidative stress is critical in dogs because parvovirus causes both inflammatory and antioxidant alterations. The aim of this study was to investigate inflammatory and antioxidant changes caused by canine parvoviral enteritis to better understand the oxidative stress process related to this disease. Thus, the total thiol, native thiol, disulfide, and ischemia-modified albumin levels of Canine parvovirus infected symptomatic puppies and healthy puppies were examined. Using the results of complete blood counts, the blood serum thiol-disulfide homeostasis and ischemia modified albumin levels of the puppies with Canine parvoviral enteritis (n = 65) and the healthy puppies (n = 34) were compared. Canine parvoviral enteritis and control groups showed a statistically significant difference in thiol disulfide levels (p < 0.01), while no significant difference was observed in ischemia modified albumin levels between the two groups. As a result of this study, a picture contradictory to the literature information was discovered; it is believed that integrating research on oxidative stress at various stages of disease progression, including the early stage, clinical period and recovery processes may provide more information about the dynamics of oxidative stress during disease progression.
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    Can Thiol/Disulphide Homeostasis Help in The Differential Diagnosis of Appendicitis in Children?
    (2020) Demir, Sabri; Günal, Yasemin Dere; Özmen, İsmail; Badem, Nermin Dindar; Neselioglu, Salim; Erel, Özcan
    Objective: We aimed to investigate the potential of assessing thiol/disulfide homeostasis as novel oxidative stressmarkers to improve the challenging diagnosis of acute appendicitis in children.Material and Methods: A total of 60 pediatric patients (0-18 years) were enrolled in the study, 30 of which were inthe control group and 30 in the acute appendicitis group. Native thiol, total thiol, dynamic disulfide, dynamic thiol,ischemia modified albümin, albumin, White blood cell, hemoglobin, hematocrit, and platelet counts of both groups weremeasured. The results of both groups were compared using the SPSS (Statistical Package for Social Sciences) version17 (Chicago, USA) program. For all variables, p <0.05 was considered significant.Results: Total thiol (p<0.001), native thiol (p<0.001), and albümin (p<0.001) levels were significantly decreased whiledynamic disulfide, dynamic thiol (p=0.003), and ischemia modified albümin (p<0.001) levels those indicating oxidantside were increased in acute appendicitis group compared to control. White blood cell counts in acute appendicitisgroup were higher (p<0.001), and platelet counts were lower (p=0.03) than the control group.Conclusion: In the differential diagnosis of acute appendicitis, especially in case that are difficult to diagnose, besides aphysical examination, imaging, and current laboratory tests, quantification of thiol/disulfide homeostasis may be helpfulin diagnosing. In addition, evaluating albumin and IMA levels may increase the specificity of the test. This test can bemore helpful in cases diagnosis is difficult such as children small in their ages and mental retardation.
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    Dynamic thiol-disulphide homeostasis and ischemia modified albumin levels in neonatal calf diarrhea
    (Ankara Univ, 2023) Terzi, Osman Safa; Kara, Erdal; Şenel, Yasin; Ceylan, Ebubekir; Neşelioğlu, Salim; Erel, Özcan
    The aim of this study was to determine dynamic thiol-disulphide homeostasis (TDH) parameters and ischemia modified albumin (IMA) levels in calves with neonatal diarrhea and compare with healthy controls. A total of 50 calves were included in the study. There were 25 calves in both diarrhea and healthy groups. Serum native thiol, total thiol, disulfide and IMA levels were measured using new methods. Native thiol (P=0.025) and total thiol (P=0.041) values decreased significantly in calves with neonatal diarrhea compared to the healthy control group. Disulphide (P=0.133), disulphide/native thiol ratio (P=0.001) and IMA (P=0.0018) parameters were lower in healthy group, and the difference between the two groups was significant for the parameters other than disulphide. This study shows that TDH is impaired in neonatal calf diarrhea and IMA levels are increased due to oxidative stress.
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    Is Thiol-Disulphide Homeostasis an Indicative Marker in Prediction of Metastasis in Lung Cancer Patients
    (CLIN LAB PUBL, 2020) Yalçın, Selim; Kurt, Özkan; Çifci, Aydın; Erel, Özcan
    Background: Thiol/disulfide (SH/SS) homeostasis plays an essential and dynamic role in our body and in various cellular activities and pathways such as cell death, regulation of enzyme activities, mechanisms of transcription and cellular signal transduction. Lung cancer is the most commonly seen cancer type in the adult population. Therefore, prediction of metastases gains importance in this population. Methods: We included 150 patients with lung cancer who attended Kirikkale University Medical Faculty Hospital between June 2017 and June 2018. Our purpose was to evaluate whether metastases can be predicted in lung cancer patients by testing SH/SS homeostasis as a novel and easily applicable biochemical test. Results: The mean age of the patients was 63.8 +/- 8.1 (41 - 71) years. Advanced stage lung cancer, adenocarcinoma, squamous-cell and small cell lung cancers, and other types were detected in 54.7%, 42.7%, 41.3%, 13.3%, and 2.7% of the patients, respectively. SS values of the patients with advanced stage lung cancer were higher than in patients with early stage lung cancer (p < 0.001). It was determined that the patients with advanced stage lung cancer had statistically significantly higher mean values of SS, SS/SH (%), and SS/total SH (%) than patients with early stage lung cancer and that a statistically significantly lower mean value of SH/total SH (%) was found in advanced stage compared with early stage lung cancer patients. No statistically significant difference was found between the patient groups with advanced and early stage lung cancer regarding mean values of native SH and total SH levels. Conclusions: It can be concluded that SH/SS parameters may vary in advanced and early stage lung cancer patients; however, further studies should be conducted with SH/SS parameters in order to use them as indicators of cancer severity in lung cancer patients.
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    Significance of thiol/disulphide homeostasis and ischemia modified albumin levels in chronic obstructive pulmonary disease
    (2019) Eroğlu, Oğuz; Badem, Nermin Dindar; Baccıoğlu, Ayşe; Cömertpay, Ertan; Neselioglu, Salim; Erel, Özcan
    Objectives: The severity of inflammation occurring during chronic obstructive pulmonary disease (COPD) isclosely associated with oxidative stress. The aim of this study was to investigate the diagnostic value ofThiol/disulphide homeostasis (TDH) and ischemia modified albumin (IMA) levels in evaluating oxidativestress in COPD patients.Methods: This prospective study was performed with COPD patients presenting to the Kırıkkale UniversityHospital and with healthy volunteers. Subjects’ demographic data (age, sex, body mass index, and smokingstatus), native thiol (NT), total thiol (TT), disulphide (Ds), IMA levels and Ds/NT, Ds/TT and NT/TT ratioswere recorded. Statistical analysis was performed with SPSS 21.0 software.Results: One hundred ninety subjects were enrolled in the study, 141 COPD patients and 49 healthy volunteers.No difference was determined between the patient and control groups in terms of age, sex or body mass index.The antioxidant markers; NT and TT levels and NT/TT ratio were significantly lower in the patient groupcompared to the control group (p < 0.001, p < 0.001, and p < 0.003, respectively). The oxidant markers; IMAlevels and Ds/NT and Ds/TT ratios were significantly higher in the patient group (p = 0.006, p = 0.003, and p= 0.003, respectively). Significant negative correlation was determined between antioxidant and oxidantparameters. Sensitivity values were NT: 87.2%, TT: 83.3%, Ds/NT ratio: 68.1%, Ds/TT ratio: 68.1%, and IMA:77.8%.Conclusions: TDH was impaired in favor oxidants in COPD patients. TDH parameters and IMA can be usedto monitor oxidative stress emerging in COPD.
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    The efficacy of adenotonsillectomy on oxidative stress evaluated by thiol/disulfide balance
    (Wiley, 2021) Tursun, Serkan; Şimşek, Gökçe; Muluk, Nuray Bayar; Taş, Mustafa Burak; Erel, Özcan
    Background Oxidative stress plays a role in the pathogenesis of many chronic diseases. Upper airway obstruction has been identified as a risk factor for increased oxidative stress-related disorders such as obstructive sleep apnea. The effect of adenotonsillar hypertrophy, which may result in a narrowing of the upper airways, on oxidative stress can be a valuable subject of research. This study aimed to investigate the efficacy of adenotonsillectomy on oxidative stress evaluated using the thiol / disulfide balance. Methods Thirty children who underwent adenotonsillectomy and 30 healthy controls, all aged from 3 to 18 years, were included in the study. Blood samples were taken preoperatively and 3 months postoperatively in the study group; in the control group, baseline blood samples were taken and samples were again taken 3 months later. Thiol / disulfide homeostasis items were analyzed. Antioxidant markers were native thiol, total thiol, and native / total thiol. Oxidative stress markers were disulfide, disulfide / native thiol, and disulfide / total thiol. Results At the preoperative period, oxidative stress parameters of thiol / disulfide homeostasis were higher in the study group than in the control group (P < 0.05) and antioxidant activity parameters were lower than in the control group (P < 0.05). Three months postoperatively, oxidative stress parameters were lower than in the control group (P < 0.05), and antioxidant parameters were no different from those in the control group (P > 0.05). In the adenotonsillectomy group considered separately, oxidative stress markers of disulfide and disulfide / native thiol decreased (P < 0.05) and antioxidant markers of native thiol and total thiol increased in the postoperative measurements (P < 0.05). Conclusions Oxidative stress related to adenotonsillar hypertrophy decreased after adenotonsillectomy. The antioxidant parameters of the thiol homeostasis increased after adenotonsillectomy. We concluded that adenotonsillectomy operations should be planned and applied timeously to prevent the adverse effects of adenotonsillar hypertrophies on thiol homeostasis.
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    The role of oxidative stress in onychomycosis: Thiol/disulphide homeostasis
    (Wiley, 2021) Metin, Mahmut Sami; Elmas, Ömer Faruk; Demirbaş, Abdullah; Erel, Özcan; Atasoy, Mustafa; Türsen, Ümit; Lotti, Torello
    Objectives Onychomycosis is the general term to define fungal nail infections that arise from dermatophytes, non-dermatophytic moulds and yeasts. Thiol/disulphide homeostasis is a new indicator of oxidative stress. In this study, we aimed to investigate the role of thiol/disulphide balance in the pathogenesis of onychomycosis. Methods This cross-sectional study included adult patients with onychomycosis who were admitted to the dermatology department and healthy adult volunteers without any dermatologic or systemic condition. The patients and controls were evaluated in terms of native thiol, total thiol, and disulphide levels, and disulphide/native thiol, disulphide/total thiol and native thiol/total thiol ratios. The possible association between these parameters and clinical subtypes of onychomycosis and demographic characteristics was also investigated. Results A total of 52 patients with onychomycosis and 50 healthy subjects were enrolled in the study. The patient group showed lower levels of total thiol, native thiol and native thiol/total thiol ratio, and higher ratios of disulphide/native thiol and disulphide/total thiol. No statistically significant relationship was found between the parameters, clinical subtypes of onychomycosis and demographic characteristics (p > .05). Conclusion Patients with onychomycosis showed a shifted thiol/disulphide homeostasis towards oxidative stress with a reduction in thiols and an increase in disulphide/native thiol, and disulphide/total thiol ratios. These findings may indicate the role of oxidative stress in the pathogenesis of onychomycosis.