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Öğe Effects of Carvacrol on Survival, Mesenteric Blood Flow, Aortic Function and Multiple Organ Injury in a Murine Model of Polymicrobial Sepsis(SPRINGER/PLENUM PUBLISHERS, 2017) Ozer, Erdem Kamil; Goktas, Mustafa Tugrul; Toker, Aysun; Bariskaner, Hulagu; Ugurluoglu, Ceyhan; Iskit, Alper BektasCarvacrol (CRV) has strong cytoprotective, antioxidant, and anti-inflammatory properties. We aimed to demonstrate the possible protective effects of CRV on survival, mesenteric artery blood flow (MBF), vascular reactivity, and oxidative and inflammatory injuries in a murine model of polymicrobial sepsis induced by cecal ligation and puncture (CLP). Wistar rats were allocated into the following four groups: Sham, CLP, Sham + CRV, and CLP + CRV. The animals were orally administered with CRV (80 mg/kg/day) or vehicle (corn oil; 1 mL/kg/day) for 7 days. At the eighth day, Sham or CLP procedure was applied. Twenty hours after the operations, MBF and contractile responses of isolated aortic preparations to phenylephrine were measured. Tissue samples were obtained for biochemical and histopathological assessments. Additionally, survival rates were recorded throughout 96 h. CRV administration improved the mesenteric perfusion, contractile function of aorta, and survival after CLP. CRV substantially prevented the elevations in the levels of LDH, BUN, Cr, and inflammatory cytokines (tumor necrosis factor-alpha, interleukin-1 beta and interleukin-6) but could not prevent the elevations of AST and ALT after CLP. The decreased liver, kidney, and spleen glutathione levels and increased liver, kidney, lung, and spleen malondialdehyde levels induced by CLP were substantially restored by CRV. Also, histopathological protective effects of CRV on multiple organ damage due to CLP were observed. CRV possesses strong ameliorative effects on sepsis due to its protective effects on mesenteric perfusion and aortic function and its antioxidative and anti-inflammatory effects.Öğe Effects of the storage of breast milk at different temperatures on total antioxidant capacity, total oxidant status, and paraoxonase-1 level(TURKISH J PEDIATRICS, 2019) Konak, Murat; Minici, Murat; Tarakçı, Nuriye; Altunhan, Hüseyin; Toker, Aysun; Örs, RahmiBreast milk is a well-balanced ideal nutritional source with high bioavailability for infants. As being a fresh, biological and dynamic product, changes in the breast milk during these storage periods have been the subject of ongoing research. This study aims to evaluate total antioxidant capacity (TAC), total oxidant status (TOS), and paraoxonase-1 (PON-1) levels of fresh and freeze-stored breast milk. Ten cc of breast milk was obtained from the mothers as the days between 10 and 15 in the morning within a 1-hour period. TAC, TOS, and PON-1 levels were evaluated in the fresh breast milk. Collected breast milk samples were divided into two groups for storage at -20 degrees C or -80 degrees C. Stored samples were tested for TAC, TOS, and PON-1 levels after 72 hours. The highest TAC level was detected in fresh breast milk (p <0.05). The TOS levels of fresh breast milk showed a statistically significant reduction in rate after storage. The TOS levels at -20 degrees C and -80 degrees C were significantly lower at -80 degrees C (p <0.05). Our study results show that oxidant and antioxidant activities are at the maximum level in the fresh breast milk. In terms of antioxidant status the effect of freezing temperatures hasn't been determined. We conclude that it is more convenient to store the breast milk at -80 degrees C than to store at -20 degrees C in terms of preserving the storage TOS level.Öğe Infliximab alleviates the mortality, mesenteric hypoperfusion, aortic dysfunction, and multiple organ damage in septic rats(CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS, 2017) Ozer, Erdem Kamil; Goktas, Mustafa Tugrul; Kilinc, Ibrahim; Toker, Aysun; Bariskaner, Hulagu; Ugurluoglu, Ceyhan; Iskit, Alper BektasTumor necrosis factor-alpha (TNF-alpha) is a pivotal mediator that triggers inflammatory process, oxidative stress, and multiple organ injury in sepsis. We investigated the effects of infliximab on survival, mesenteric artery blood flow (MBF), vascular reactivity, and oxidative and inflammatory injuries in cecal ligation and puncture (CLP)-induced sepsis. Wistar rats were divided into Sham, CLP, Sham+infliximab, and CLP+infliximab subgroups. Twenty-four hours before the operations, rats were injected intraperitoneally with infliximab (7 mg/kg) or vehicle (saline; 1 mL/kg). Twenty hours after the operations, MBF and phenylephrine responses of isolated aortic rings were measured. Tissue damages were examined biochemically and histopathologically. Furthermore, survival rates were monitored throughout 96 h. Infliximab improved survival, mesenteric perfusion, and aortic function after CLP. Increases of serum AST, ALT, LDH, BUN, Cr, and inflammatory cytokines (tumor necrosis factor-alpha, interleukin-1 beta, and interleukin-6) induced by CLP were blocked by infliximab. Infliximab prevented malondialdehyde elevations in septic liver, lung, spleen, and kidney tissues, as well as glutathione reductions in septic liver, spleen, and kidney tissues. Protective effects of infliximab on multiple organ damage were also observed histopathologically. Infliximab showed protective effects in sepsis due to its improvement effects on mesenteric perfusion, aortic function, and its anti-inflammatory and antioxidative effects.Öğe Investigation of Oxidative Stress Markers in Essential Hypertension(CLIN LAB PUBL, 2013) Toker, Aysun; Mehmetoglu, Idris; Yerlikaya, F. Humeyra; Nergiz, Suleyman; Kurban, Sevil; Gok, HasanBackground: The main goal of this study was to evaluate ischemia modified albumin (IMA), total antioxidant status (TAS), and total oxidant status (TOS) levels in treated essential hypertensive patients and to compare them with levels of normotensive subjects. Methods: In 45 hypertensive and 30 control subjects, serum levels of IMA were determined manually using a spectrophotometric Co(II)-albumin binding assay. TAS and TOS levels were evaluated spectrophotometrically. Lipid profile was estimated by routine methods. Results: Hypertensive patients had significantly higher levels of TOS and IMA (p = 0.020 and p = 0.034, respectively) and lower levels of TAS (p = 0.016) in comparison with control subjects. Serum levels of TAS were negatively correlated with TOS and IMA levels in the patient group. Serum levels of TOS were also positively correlated with IMA levels. There was no significant correlation between blood pressure and TAS, TOS, and IMA levels. Conclusions: Our results showed higher levels of IMA in hypertensive patients. We suggest that higher levels of IMA may result from increased oxidative stress and decreased antioxidant status in hypertensive patients.Öğe Protective Effects of Biochanin A against Methotrexate-Induced Acute Liver Injury in Rats(ASSOC PHARMACEUTICAL TEACHERS INDIA, 2017) Ozer, Erdem Kamil; Goktas, Mustafa Tugrul; Toker, Aysun; Ugurluoglu, Ceyhan; Bariskaner, HulaguBackground: Methotrexate (MTX) is one of the most commonly used chemotherapeutic agents in the treatment of cancer patients, however its therapeutic use is limited due to dose dependent hepatotoxicity caused by oxidative damage. Biochanin A (BCA), a naturally occurring dietary isoflavone, has strong cytoprotective, anti-inflammatory, and antioxidant properties. Although protective actions of BCA against various chemical-induced hepatotoxicity including that of carbon tetrachloride and arsenic, none of the studies was made on MTX-induced acute liver injury. Methods: Wistar rats were separated into four groups; Control, MTX, Control+BCA, MTX+BCA. BCA (50 mg/kg/day) or vehicle (dimethyl sulfoxide; 1 mL/kg/day) with the same volume was intraperitoneally injected for 5 days. At sixth day, a single dose of MTX (20 mg/kg) was injected to rats. Twenty-four h after the MTX administration, rats were sacrificed and then blood and liver samples were obtained for biochemical and histopathologic analyses. Results: MTX increased the serum AST, ALT, and LDH levels. Furthermore, malondialdehyde (an indicator of oxidative injury) and myeloperoxidase (an indicator of neutrophil infiltration) levels increased, while total glutathione levels (an indicator of antioxidant status) decreased in liver. MTX-induced hepatotoxicity was also observed histopathologically. BCA substantially improved these alterations induced by MTX administration. Conclusion: These results indicate that BCA may be useful in preventing the MTX-induced acute liver injury due to its antioxidant and anti-inflammatory properties.Öğe Serum ischemia-modified albumin and oxidized LDL in cord blood and serum of neonates born to pre-eclamptic mothers(WILEY, 2015) Mehmetoğlu, İdris; Kurban, Sevil; Toker, Aysun; Annagür, Ali; Altunhan, Hüseyin; Erbay, Ekrem; Örs, RahmiBackgroundWe investigated oxidized low-density lipoprotein (OxLDL) and ischemia-modified albumin (IMA) in cord blood and neonatal blood of 7-day-old neonates born to pre-eclamptic and normotensive healthy mothers. MethodsThe study was performed on 30 neonates born to pre-eclamptic and 20 neonates born to normotensive mothers. IMA and OxLDL were determined on spectrophotometry and ELISA, respectively. ResultsIMA in cord blood was higher in the pre-eclamptic group as compared with the normotensive group, but the difference between the groups was not significant. IMA in neonate venous blood was significantly higher in the pre-eclamptic group than in the normotensive group (P < 0.001). OxLDL in both cord blood and in neonate venous blood was significantly higher in the pre-eclamptic group compared with the normotensive group (P < 0.001). IMA and OxLDL were significantly decreased after delivery in both groups. ConclusionsSignificantly increased cord blood OxLDL and significantly increased OxLDL and IMA 7days after birth in neonates born to pre-eclamptic mothers might be an indicator of increased oxidative stress in pre-eclampsia.Öğe Serum levels of TWEAK in patients with psoriasis vulgaris(ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2016) Bilgiç, Özlem; Sivrikaya, Abdullah; Toker, Aysun; Ünlü, Ali; Altınyazar, Hilmi CevdetTumour necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) has been implicated in the pathogenesis of a variety of inflammatory disorders and autoimmune diseases. However, studies conducted on the relationship of TWEAK and psoriasis patients are limited. In this study, we aimed to explore the serum levels of TWEAK and investigated whether TWEAK levels are associated with clinical variables and expression of other well-known psoriasis-related cytokines including IL-6, IL-23 and TNF-alpha. Fortyfive patients with chronic plaque psoriasis and 43 controls were enrolled in this study. The severity of psoriasis was assessed by the Psoriasis Area and Severity Index (PASI). Serum levels of cytokines were measured using commercial enzyme-linked immunosorbent assay (ELISA) kits. The mean TWEAK, IL-6, IL-23, and TN-alpha levels were significantly higher in psoriasis patients than in control subjects. However, there were no significant correlations between the psoriasis severity, the illness duration and serum cytokine levels. This study shows that TWEAK may be associated with the pathogenesis of psoriasis, like TNF-alpha, IL-6, and IL-23. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Thymoquinone protects against the sepsis induced mortality, mesenteric hypoperfusion, aortic dysfunction and multiple organ damage in rat(POLISH ACAD SCIENCES INST PHARMACOLOGY, 2017) Ozer, Erdem Kamil; Goktas, Mustafa Tugrul; Toker, Aysun; Pehlivan, Sultan; Bariskaner, Hulagu; Ugurluoglu, Ceyhan; Iskit, Alper BektasBackground: Thymoquinone (TQ) is a potent cytoprotective, antioxidant and anti-inflammatory agent. We aimed to investigate the possible protective effects of TQ on survival, mesenteric artery blood flow (MABF), vascular reactivity, oxidative and inflammatory injuries in a murine sepsis model induced by cecal ligation and puncture (CLP).Methods: Wistar rats were divided into the following four groups: Sham, CLP, Sham + TQand CLP + TQ. TQ (1 mg/kg/day) or vehicle (dimethyl sulfoxide, 1 mL/kg/day) was intraperitoneally injected for 3 days. At 4th day Sham or CLP operation was applied. 20 h after the operations, MABF and contractile responses of isolated aortic rings to phenylephrine were measured. Tissue samples were obtained for histopathological and biochemical examinations. Also, survival rates were recorded throughout 96 h.Results: TQ ameliorated mesenteric hypoperfusion and partially attenuated aortic dysfunction induced by CLP. Survival rate was %0 at 42nd h in CLP group, but in CLP + TQ group it was 33.4% at the end of 96 h. Serum levels of AST, ALT, LDH, BUN, Cr and inflammatory cytokines (tumor necrosis factor-alpha, interleukin-1 beta and interleukin-6) increased in CLP group that were prevented by TQ. The decreases in liver, spleen and kidney glutathione levels and the increases in liver, lung, kidney and spleen malondialdehyde levels induced by CLP were inhibited by TQ. The histopathological protective effects of TQ on multiple organ damage due to CLP were also observed.Conclusion: TQ has ameliorative effects on sepsis due to its protective effects on mesenteric perfusion, contractile function of aorta and its anti-inflammatory and antioxidative effects. (C) 2017 Institute of Pharmacology, Polish Academy of Sciences. Published by Elsevier Sp. z o.o. All rights reserved.Öğe Total antioxidant, total oxidant and serum paraoxonase levels according to lipid administration method in parenterally fed premature infants(TAYLOR & FRANCIS LTD, 2017) Konak, Murat; Tarakcı, Nuriye; Altunhan, Hüseyin; Annagür, Ali; Toker, Aysun; Örs, RahmiObjective: The aim of our study was to determine whether lipid solutions delivered separately or in mixture with total parenteral nutrition (TPN) solutions effect the balance between oxidant and antioxidant levels in premature infants.Methods: A total of 60 preterm newborns who were delivered at their 30-34 gestational weeks and received TPN were included in the study. Premature newborns were randomized into two groups based on the delivery method of the lipid solution, separately (Group 1) or in mixture with TPN solutions (Group 2). Total antioxidant status (TAS), total oxidant status (TOS) and paraoxonase (PON-1) levels were analyzed in both blood samples, and oxidative stress index (OSI) was also calculated.Results: Thirty cases from both groups were included in the study. Statistically significant decrease in the level of TAS and increase in the level of PON-1 were detected at 72h of TPN therapy in both groups (p<0.05). Statistically significant decrease in both TOS and OSI levels were observed in Group 2 (p<0.05). In association with these findings, any statistically significant intergroup difference was not detected in both parameters regarding oxidant balance (p>0.05).Conclusion: Our study showed that according to lipid administration method any difference for oxidant-antioxidant balance was not detected.
