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    Does Subclinical Hypothyroidism Affect Dynamic Thiol/Disulfide Homeostasis and ischemia-modified Albumin Levels in Children?
    (COLL PHYSICIANS & SURGEONS PAKISTAN, 2020) Tursun, Serkan; Alpcan, Aysegul; Ergur, Ayca Torel; Karahan, Irfan; Neselioglu, Salim; Erel, Ozcan
    Objective: To determine the effects of subclinical hypothyroidism on oxidative stress in children. Study Design: A cross-sectional study. Place and Duration of Study: Department of Paediatrics, Paediatric Endocrinology, and General Outpatient Clinics, Kirikkale University, School of Medicine, from May 2017 to October 2018. Methodology: This study included 92 subjects aged between 2 and 18 years. The subjects were divided into two groups. Forty-seven children with subclinical hypothyroidism and 45 healthy controls were evaluated. In order to evaluate oxidative damage, native thiol, total thiol, disulfides, their ratios, and ischemia-modified albumin (IMA) levels were compared between the two groups. The relationship between TSH and IMA levels was assessed. Results: Age and gender were not significantly different in the two groups. Native thiol, total thiol, disulfides and their ratios were similar in the two groups. lschemia-modified albumin levels were significantly higher in the patient group than the controls (p<0.001). There was no correlation between TSH and IMA levels in the patient group (r=0.069 p=0.645). Conclusion: Subclinical hypothyroidism may be related to the impairment of IMA, and have a neutral effect on thiol/disulfide balance. Further research is needed to explain the effects of oxidative stress in subclinical hypothyroidism.
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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; Senel, Yasin; Ceylan, Ebubekir; Neselioglu, Salim; Erel, Ozcan
    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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    Evaluation of the effect of chiropractic manipulative treatment on oxidative stress in sacroiliac joint dysfunction
    (BAYCINAR MEDICAL PUBL-BAYCINAR TIBBI YAYINCILIK, 2020) Kultur, Turgut; Ciftci, Aydin; Okumus, Muyesser; Dogan, Murat; Durmaz, Senay Arikan; Neselioglu, Salim; Erel, Ozcan
    Objectives: This study aims to investigate the effect of chiropractic manipulative treatment on sacroiliac joint dysfunction (SIJD) and its relationship to oxidative stress (OXS) parameters. Patients and methods: Thirty-three patients diagnosed with SIJD (20 males, 13 females; mean age 36.3 +/- 9.7 years; range, 18 to 60 years) and 30 healthy volunteers (20 males, 10 females; mean age 36.4 +/- 12.2 years; range, 20 to 57 years) were included in this cross-sectional, case-control study conducted between February 2017 and September 2017. Manipulation was applied to the patients once a week for a duration of four weeks. The patients were evaluated at pre-treatment and one month after treatment with visual analog scale, SIJD test, and total thiol, native thiol, disulphide, and ischemia-modified albumin (IMA) as OXS indicators. Results: Prior to treatment, we demonstrated that serum native thiol (mu mol/L) and total thiol (mu mol/L) levels in the patient group were lower compared to control subjects (p=0.03 and p=0.02, respectively). Serum IMA levels were higher in the patient group (p=0.01). There was no change in OXS parameters after manipulative treatment in the patient group. Conclusion: Manipulation is useful in SIJD. Thiol/disulphide homeostasis and serum IMA levels may be used to measure the OXS in patients with SIJD.
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    Evaluation of thiol-disulphide homeostasis in radiation workers
    (Taylor & Francis Ltd, 2017) Koc, Ural; Tan, Sinan; Ertem, Ahmet Goktug; Gumus, Mehmet; Ozbek, Betul; Erel, Ozcan
    Purpose: To evaluate thiol-disulphide homeostasis - a novel, easily calculated, readily available, and relatively cheap oxidative stress marker - in radiation workers and compare the results with healthy controls.Materials and methods: A total of 108 participants were enrolled in the study including 63 hospital workers occupationally exposed to ionizing radiation in the units of interventional radiology, interventional cardiology and nuclear medicine. A control group consisted of 45 individuals staff in the same hospital. Serum thiol-disulphide homeostasis measurement was investigated via the spectrophotometric method newly described by Erel and Neeliolu.Results: The mean serum native thiol levels of radiation workers (528.9686.42mol/l) was significantly lower than control subjects (561.05 +/- 104.83mol/l) (p=.045). The mean serum total thiol levels of radiation workers (547.70 +/- 91.50mol/l) was lower than control subjects (580.36 +/- 112.24mol/l). Nevertheless, there was no significant difference between total thiol of exposed workers and controls.Conclusions: The results show that long-term low dose ionizing radiation may lead to oxidative stress and have side-effects in antioxidant thiol groups. We may suggest supporting radiation workers by safe antioxidant nutritional formulations and following up via both physical dosimetry and biodosimetric methods.
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    Investigation of Thiol/Disulfide Balance in Obese Rats with Non-Alcoholic Fatty Liver Disease
    (Korean Soc Pediatric Gastroenterology & Nutrition, 2021) Tursun, Serkan; Gulerman, Hacer Fulya; Gazyagci, Serkal; Sahin, Yasar; Erel, Ozcan; Neselioglu, Salim
    Purpose: Due to the increasing prevalence of obesity worldwide, non-alcoholic fatty liver disease (NAFLD) has reached epidemic dimensions over time. NAFLD is the most common cause of childhood chronic liver disease. There is a relationship between NAFLD and oxidative stress. This study aims to investigate the changes in thiol/disulfide homeostasis parameters to determine the oxidant/antioxidant balance in obese rats with diet-induced NAFLD and healthy rats. Methods: Twelve Wistar albino rats were used in this study. Experimentally produced NAFLD obese rats (n=6) and healthy rats were compared. Experimental NAFLD model was created with a special fatty liver diet (Altromin (R) C1063, Fatty Liver Diet, Exclusivet, Lage, Germany). The biochemical and histopathological features of the groups, as well as serum thiol/disulfide homeostasis parameters, were analyzed and compared. Results: In the experimentally induced NAFLD rat model, they gained more weight than the control group. Steatosis (at least grade 2) occurred in all rats fed with special fatty liver diet for 12 weeks. Histopathologically, no high-grade inflammation was observed in rats with experimental NAFLD after feeding a diet for 12 weeks. Results revealed that aspartate transaminase and alanine transaminase levels were high, albumin levels were low, oxidant stress parameters increased, and antioxidant thiol groups decreased. Conclusion: Experimental NAFLD is characterized by increased oxidant stress accompanying fatty tissue in the liver. Analysis of thiol/disulfide homeostasis parameters in NAFLD can be used in further studies to develop effective treatment options.
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    Reply to the Letter to the Editor for "Evaluation of the effect of chiropractic manipulative treatment on oxidative stress in sacroiliac joint dysfunction"
    (BAYCINAR MEDICAL PUBL-BAYCINAR TIBBI YAYINCILIK, 2020) Kultur, Turgut; Ciftci, Aydin; Okumus, Muyesser; Dogan, Murat; Durmaz, Senay Arikan; Neselioglu, Salim; Erel, Ozcan
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    The efficacy of adenotonsillectomy on oxidative stress evaluated by thiol/disulfide balance
    (Wiley, 2021) Tursun, Serkan; Simsek, Gokce; Muluk, Nuray Bayar; Tas, Mustafa Burak; Erel, Ozcan
    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, Omer Faruk; Demirbas, Abdullah; Erel, Ozcan; Atasoy, Mustafa; Tursen, Umit; 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.