Background/aim: Thiol status is a good reflector of the cellular redox and have vital roles in various cellular signaling pathways. The purpose of the study was to investigate thiol status in patients with SARS-CoV-2 infection.Materials and methods: A total of 587 subjects (517 patients/70 healthy controls) were enrolled in the study.The patients were categorized into the groups regarding to the severity of disease (mild, moderate, severe, and critical).Thiol status of all groups were compared. Results:The patients had significantly diminished thiol levels compared to controls. Thiol levels were gradually decreased as the severity of the disease increased. Logistic regression analyses identified that thiol concentrations were an independent risk factor for the disease severity in each phase (mild group OR 0.975, 95%CI 0.965-0.986; moderate group, OR 0.964, 95%CI 0.953-0.976; severe group OR 0.953, 95%CI 0.941-0.965; critical group OR 0.947, 95%CI 0.935-0.960).Thiol test exhibited the largest area under the curve at 0.949, with the highest sensitivity (98.6%) and specificity (80.4%).Conclusions: Depleted thiol status was observed in SARS-CoV-2 infection. Decline of the thiol levels by degrees while the severity of infection increased was closely related to the progression of the disease. This outcome highlights that thiols could be an impressible biomarker for predicting of the severity of COVID-19.

Objective To assess thiol/disulphide homeostasis and lipid accumulation product index, and to determine whether they are associated with increased cardiovascular disease (CVD) risk or not in overweight adolescents with polycystic ovary syndrome (PCOS). Design Case-control study. Setting Education and Research Hospital. Patients Group 1: 43 overweight+PCOS, Group 2: 45 normal weight+PCOS, Group 3: 27 overweight adolescents and Group 4: 96 age-matched, normal weight healthy controls. Interventions Serum lipid profiles, hormonal parameters and thiol/disulphide homeostasis were measured. Lipid accumulation index (LAP index) and homeostasis model assessment (HOMA-IR) were calculated. Main outcome measures The relation between thiol/disulphide homeostasis and LAP index, and increased CVD risk were evaluated in overweight adolescents with PCOS. Results Native and total thiol levels were significantly lower in overweight+PCOS adolescents when compared with both normal weight PCOS and control adolescents (P = 0Á002). LAP index values were significantly higher in Group 1 when compared separately with the rest of the three groups (P < 0Á001). Multivariable logistic regression analysis revealed serum total thiol levels of lower than 405Á45 lmol/l were independently associated with increased risk of CVD in overweight PCOS adolescents (OR: 1Á019, 95% CI: 1Á001-1Á036). In addition, a LAP index greater than 21Á54 was also associated with increased CVD risk in overweight PCOS adolescents (OR: 1Á270, 95% CI: 1Á174-1Á374). ConclusionIn conclusion, we suggest that increased LAP index and decreased total thiol levels may contribute to the increased CVD risk in overweight adolescents with PCOS.

The aim of this study was to investigate thiol/disulfide homeostasis in asphalt workers who are exposed to polycyclic aromatic hydrocarbons occupationally. The study was carried out in 34 nonsmoker asphalt workers. Additionally, 35 healthy nonsmoker volunteers were recruited as control group. Thiol and disulfide concentrations were determined using the novel automated measurement method. Levels of urinary 1-OH-pyrene were analyzed by liquid chromatography. Disulfide/thiol ratio was significantly higher in exposed group (p = .034). Also, a positive correlation was detected between disulfide/thiol ratio and 1-OH-pyrene values (r = .249, p = .036). Thiol/disulfide homeostasis was found to be disturbed in asphalt workers. The novel test used in this study may be useful for evaluating the oxidative status in polycyclic aromatic hydrocarbon (PAH) exposure.

In this study, we aimed to investigate whether degree of pneumonia and COVID-19 prognosis are associated with serum endocan levels at the early stage, when vascular damage has started. Patients between the ages of 18–85 years who were hospitalized and followed up with a diagnosis of COVID-19 were included in the study. A total of 80 patients were divided into 2 groups as mild/moderate pneumonia and severe pneumonia. Serum endocan levels were measured on the 8th day from the onset of symptoms in all patients. Of the 80 patients included in the study, 56.3% were female and 43.8% were male. There was no significant relationship between serum endocan levels and degree of pneumonia ( P = .220) and prognosis of the disease ( P = .761). The correlation analysis indicated a weak positive correlation between serum endocan levels and lactate level in venous blood gas (r = .270; P = .037). During the 28-day follow-up, the mortality rate was 3.75%. It was determined that the serum endocan levels was not associated with the degree of pneumonia and was not an early prognostic marker for COVID-19.

Background Rosacea is a chronic inflammatory skin disease characterized with increased serum and tissue inflammatory mediators. IL‐17 is a well‐known inflammatory mediator that plays important roles in pathogenesis of inflammatory skin diseases. Previous studies reported that Th17 pathway is activated in rosacea and IL‐17, one of Th17 signature cytokines, is elevated in tissue samples of rosacea patients. Objectives The aim of this study was to investigate serum IL‐17 levels in rosacea patients and to study its relationship with disease characteristics. Methods Sixty patients diagnosed with rosacea and 60 healthy controls were included in the study. Serum IL‐17 concentrations were measured using enzyme‐linked immunosorbent assay (ELISA). Results The mean serum IL‐17 level was 8.03 pg/mL (SD = 1.47) in rosacea patients and 7.37 pg/mL (Sd = 1.19) in controls. Serum IL‐17 levels were significantly higher in rosacea (p = 0.002). Serum IL‐17 levels were similar among patients with erythematotelangiectatic (ET) and papulopustular (PP) rosacea (8.02 vs 8.06, p = 0.83). Serum IL‐17 levels did not correlate with rosacea severity (p = 0.59, r = 0.07 in ET rosacea; p = 0.88, r = 0.02 in PP rosacea), age of onset (p = 0.58, r = −0.07), and disease duration (p = 0.37, r = −0.11). Primary features and global assessments did not correlate with serum IL‐17 levels (all p > 0.05). Among secondary features, edema showed a significant negative correlation with serum IL‐17 concentrations (p = 0.037, r = −0.26). Conclusions Our study showed increased serum IL‐17 levels in rosacea patients and a significant correlation between IL‐17 concentrations and secondary features of the disease suggesting IL‐17 may contribute to pathogenesis of rosacea and may be a new target for rosacea treatment.

Our study showed that dynamic thiol-disulphide homoeostasis has shifted towards disulphide formation, as a result of thiol oxidation in ARC patients. The present study is the first to measure thiol-disulphide homoeostasis in ARC patients with a novel automated assay. This study supports the hypothesis that cataract is an oxidative disorder. Further studies are required in order to examine the relationship between oxidative stress and the development of cataract formation.

Bu çalışmanın amacı acil servise karbon monoksit zehirlenmesi nedeniyle başvuran hastalarda oksidatif stres markerlarından olan thiol/disülfit homeostazis parametreleri ile Nötrofil-Lenfosit (NLO) beraber kullanımının tanı açısından yararlı olup olmadığını araştırmaktır. Materyal ve Metot: Çalışma 01.01.2014 ile 01.03.2015 tarihleri arasında acil servise başvuran ve çalışmaya alınan 45 hasta ve kontrol grubu olarak belirlenen 40 sağlıklı kişi ile prospektif olarak yapıldı. Erel ve Neşelioğlu tarafından yeni geliştirilen bir metot ile oksidatif stres markerı olan thiol/disülfit homeostazis parametreleri (Thiol, disülfit, disülfit/native thiol, disülfit/total thiol, native thiol/total thiol) ile NLO hasta ve kontrol grubunda çalışıldı. Bulgular: Karbonmonoksit zehirlenmesi olanlarda kontrol grubuna göre, NT, TT, index 3 ve NLO oranlarında anlamlı farklılık tespit edildi. NT, TT ve index 3 hasta grubunda daha düşük, NLO ortalama değerleri daha yüksek bulundu (sırasıyla p =0,005; < 0,001; < 0,032 ve < 0,001). Sonuç: NLO ile thiol/disülfit homeostasis parametrelerinin karbonmonoksit zehirlenmesi tanısında beraber kullanılması bu hastalarda tanının konulması açısından faydalıdır.

Introduction Following a pandemic, laboratory medicine is vulnerable to laboratory errors due to the stressful and high workloads. We aimed to examine how laboratory errors may arise from factors, e.g., flexible working order, staff displacement, changes in the number of tests, and samples will reflect on the total test process (TTP) during the pandemic period. Materials and methods In 12 months, 6 months before and during the pandemic, laboratory errors were assessed via quality indicators (QIs) related to TTP phases. QIs were grouped as pre-, intra- and postanalytical. The results of QIs were expressed in defect percentages and sigma, evaluated with 3 levels of performance quality: 25 th , 50 th and 75 th percentile values. Results When the pre- and during pandemic periods were compared, the sigma value of the samples not received was significantly lower in pre-pandemic group than during pandemic group (4.7σ vs. 5.4σ, P = 0.003). The sigma values of samples transported inappropriately and haemolysed samples were significantly higher in pre-pandemic period than during pandemic (5.0σ vs. 4.9σ, 4.3σ vs. 4.1σ; P = 0.046 and P = 0.044, respectively). Sigma value of tests with inappropriate IQC performances was lower during pandemic compared to the pre-pandemic period (3.3σ vs. 3.2σ, P = 0.081). Sigma value of the reports delivered outside the specified time was higher during pandemic than pre-pandemic period (3.0σ vs. 3.1σ, P = 0.030). Conclusion In all TTP phases, some quality indicators improved while others regressed during the pandemic period. It was observed that preanalytical phase was affected more by the pandemic.