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    Can melatonin correct the negative effect of experimental diabetes created during the maternal period on fetal rat development and puppies cognitive functions?
    (2021) Evren, Bahri; Koz, Sema Tulay; Ozkan, Yusuf; Guldogan, Emek
    Aim: Chronic hyperglycemia can cause cognitive impairments such as learning and memory impairment. In our study, we aimed to investigate the levels of glial fibrillary acidic protein (GFAP), neural cell adhesion molecules (NCAM), lipid peroxidation (LPO), and glutathione (GSH) molecules and the protective effect of melatonin in the brain tissue of baby rats with diabetic mothers. Materials and Methods: Wistar-Albino rats used in the experiments were obtained from Firat University Experimental Research Center. Morris Water Maze Test is a learning and memory test commonly used in rats and mice. In the statistical analysis of the data; one-way analysis of variance (One-way ANOVA) was used to evaluate the significance of NCAM, GFAP, LPO, GSH levels between three groups, and repeated measures analysis of variance (Repeated measures one-way ANOVA) was used to evaluate the Morris Water Maze learning test. Results: Learning was worse in rats whose mothers were diabetic compared to diabetes + melatonin and control groups. With the administration of melatonin to diabetic mothers during their pregnancy, an improvement was observed in the learning ability of baby rats. NCAM 180, GFAP, GSH levels were significantly lower (p <0.05, p <0.001, p <0.05), and LPO level was higher (p <0.001) in baby rats with diabetic mothers compared to the control group. NCAM 180 and GFAP levels were significantly higher in the group that was administered melatonin during pregnancy (p <0.05, p <0.01), and LPO levels were lower (p <0.01). With the administration of melatonin during pregnancy, GSH levels were higher than the diabetes group, even though the difference was not statistically significant. Conclusion: Learning and memory functions are impaired in the offspring of diabetic mothers. The decrease in NCAM isoforms can inhibit brain development and the formation of synaptic plasticity. Decreased GFAP density may pose a problem in completing brain maturation in offspring of diabetic mothers. It has been observed that the administration of melatonin to diabetic mothers during their pregnancy is protective against the harmful effects of oxidative stress in their offspring due to its antioxidant effect.
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    Comparison of dialysate and plasma NTproBNP in prediction of clinical outcomes of diabetic and nondiabetic peritoneal dialysis patients
    (Dustri-Verlag Dr Karl Feistle, 2018) Koz, Suleyman; Sahin, Idris; Kayatas, Mansur; Koz, Sema Tulay
    Background: Plasma level of N-terminal pro-brain natriuretic peptide (P-NTproBNP) is a useful marker in prediction of mortality in peritoneal dialysis (PD) patients. However, the predictive value of spent dialysate counterpart (D-NTproBNP) of plasma NTproBNP on mortality and dropout is not known. Materials and methods: Simultaneous P-NTproBNP and D-NTproBNP assays were performed after an overnight dwell in 44 scheduled ambulatory PD patients. Patients were followed for similar to 47 months. Deceased patients or patients who were transferred to hemodialysis were regarded as dropouts. Results: 14 patients (31.8%) dropped out at similar to 4 years (9 deaths and 5 transfers to hemodialysis). Diabetics, males, and patients with higher membrane permeability had higher dropout rates. Patients with P-and D-NTproBNP higher than median values had higher mortality and dropout rates (Kaplan-Meier test, log-rank Test p < 0.05). Odds ratios of D-NTproBNP for death and dropouts were (3.807 (0.907-15.971), p = 0.068) and (2.87 (1.009-8.138) p = 0.048), respectively; odds ratios of P-NTproBNP for death and dropouts were (4.652 (0.914-23.693), p = 0.064) and (2.67 (0.924-7.716), p = 0.07), respectively; in ROC analysis for death, AUC for P-and D-NTproBNP were 0.762 (0.578-0.946, p = 0.016) and 0.765 (0.590-0.940, p = 0.015), respectively. Exclusion of diabetic patients from the analyses resulted in significant changes in the predictive value P-and D-NTproBNP. Although death and dropout rates were still higher in nondiabetic patients with higher NTproBNP levels, the differences between groups lost statistical significance. Conclusion: Both P-NTproBNP and D-NTproBNP are significant predictors of outcomes of interest. Predictive value of NTproBNP might be different in diabetics and non-diabetic CAPD patients.
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    Course of Encephalopathy in a Cirrhotic Dialysis Patient Treated Sequentially with Peritoneal and Hemodialysis
    (Hindawi Ltd, 2015) Koz, Suleyman; Sahin, Idris; Terzi, Zafer; Koz, Sema Tulay
    End-stage kidney disease and advanced cirrhosis are sometimes seen concomitantly. There is no consensus on dialysis modality in terms of determining the optimal way of treating these patients. It has been suggested that peritoneal dialysis is a better choice for these patients, but efficacy of hemodialysis in stable cirrhotic patients has not been evaluated sufficiently. We report a case with advanced cirrhosis and end-stage kidney disease who was faced with hepatic encephalopathy episodes up on starting renal replacement therapy. The case is also interesting in that it reveals effects of hemodialysis and peritoneal dialysis on hepatic encephalopathy episodes and quality of life of the patient.
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    Effects of resveratrol on blood homocysteine level, on homocysteine induced oxidative stress, apoptosis and cognitive dysfunctions in rats
    (Elsevier Science Bv, 2012) Koz, Sema Tulay; Etem, Ebru Onalan; Baydas, Gyasettin; Yuce, Huseyin; Ozercan, Halil Ibrahim; Kuloglu, Tuncay; Koz, Suleyman
    We aimed to examine the protective effects of resveratrol against homocysteine induced oxidative stress, apoptosis and cognitive impairment. Rats were randomly divided into three groups. Control group received standard rat food; homocysteine group (I-Icy group) received daily methionine at a dose of 1 g/kg-body weight dissolved in drinking water for thirty days; third group (Hcy+Res group) received same amount of methionine plus 20 mg/kg/day resveratrol intraperitoneally for thirty days. Cognitive performances of the animals were tested by Morris water maze test. Then all animals were sacrificed to study lipid peroxidation (LPO), DNA fragmentation and p53 mRNA expression in the rat brain. The aortas of the sacrificed rats were processed for histopathological examination. Apoptosis in the aortas was assessed by TUNEL staining. Resveratrol significantly decreased serum levels of homocysteine, reversed Hcy induced LPO increase, decreased DNA fragmentation and p53 mRNA expression in the rat brains, and improved homocysteine induced impairment of long term spatial memory. Resveratrol could inhibit homocysteine induced apoptosis and histopathological deterioration in the rat aortic sections. In conclusion, resveratrol is effective in preventing homocysteine induced vascular and neural defects. In hyperhomocysteinemic rat model, our findings consequently warrant in future studies to reveal the true improvement mechanism of resveratrol. (C) 2012 Elsevier B.V. All rights reserved.
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    Estimated Dialysate Magnesium Clearance in Peritoneal Dialysis Patients
    (Wiley-Blackwell, 2015) Koz, Suleyman; Sahin, Idris; Koz, Sema Tulay; Terzi, Zafer; Ataman, Engin; Akkus, Hadi
    [Abstract Not Available]
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    Features of Hemodialysis in Cirrhotic Patients: Single Center Experience
    (Turk Nefroloji Diyaliz Transplantasyon Dergisi, 2015) Koz, Suleyman; Sahin, Idris; Terzi, Zafer; Koz, Sema Tulay
    OBJECTIVE: End-stage kidney disease and advanced cirrhosis are sometimes seen concomitantly. Our purpose was to compare hemodialysis (HD) sessions in critically ill cirrhotic patients from ICU versus stable cirrhotic patients from outpatient clinic, and observe endurance of both stable and acutely ill cirrhotic patients to intermittent HD. MATERIAL and METHODS: All of the Child-Pugh class B or C cirrhotic patients requiring renal replacement therapy during a period of three years were included in the study. If hypotension, arrhythmia, bleeding, or any other health problems were present during dialysis, the dialysis session was regarded as a troubled session. RESULTS: There were two groups of patients. All of the stable patients lived more than three months, whereas all patients in the ICU group died within a month. Mean ultrafiltration volume per session was 1786 +/- 210 ml in ICU and 1616 +/- 266 ml in stable patients (p>0.05). The number of the troubled sessions was 24 in ICU and 1 in stable patients (p<0.0001). Bleeding was a problem in a minority of the patients. CONCLUSION: Intermittent HD may be an acceptable choice for stable cirrhotic dialysis patients. Hypotension is a frequent complication of intermittent HD in ICU patients.