Yazar "Erdogan, H" seçeneğine göre listele
Listeleniyor 1 - 20 / 20
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe The activities of tissue xanthine oxidase and adenosine deaminase and the levels of hydroxyproline and nitric oxide in rat hearts subjected to doxorubicin: protective effect of erdosteine(Elsevier Ireland Ltd, 2003) Fadillioglu, E; Yilmaz, HR; Erdogan, H; Sogut, SThe aim of this experimental study was to investigate the effects of erdosteine, an antioxidant agent, on doxorubicin (DXR)-induced cardio-toxicity through nitric oxide (NO) levels, collagen synthesis, xanthine oxidase (XO) and adenosine deaminase (ADA) activities in rats. Rats were treated with erdosteine (10 mg/kg b.wt. per day, orally) or saline starting 2 days before administrating a single dose of DXR (20 mg/kg i.p.) or saline. At the 10th day of the DXR administration, hearts were removed under anesthesia for biochemical measurements. Enzyme activities as well as OH-proline and NO levels were found to be significantly increased in DXR group compared with the control group. All of the parameters studied except ADA activity were decreased significantly approximating to the control levels upon erdosteine administration. In conclusion, erdosteine seems to be an alternative agent for protection of cardiac tissue against DXR-induced cardio-toxicity through its regulatory effect on XO activity and NO level. (C) 2003 Elsevier Ireland Ltd. All rights reserved.Öğe Caffeic acid phenethyl ester as a protective agent against doxorubicin nephrotoxicity in rats(Elsevier, 2004) Yagmurca, M; Erdogan, H; Iraz, M; Songur, A; Ucar, M; Fadillioglu, EBackground: Nephrotoxicity is one of the important side effects of antracycline antibiotics. The aim of this study was to investigate the effects of caffeic acid phenethyl ester (CAPE), an antioxidant agent, against nephrotoxicity induced by doxorubicin (DXR). Methods: The rats were divided into control, CAPE alone, doxorubicin (20 mg/kg, i.p.) and doxorubicin plus CAPE (10 mumol/kg/day, i.p.) groups. At the end of the 10th day, kidney tissues were removed for light microscopy and analysis. The levels of tissues protein carbonyl content (PC), malondialdehyde (MDA) and nitric oxide (NO) as well as the activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px) and myeloperoxidase (MPO) were determined. Plasma oxidants and antioxidants were also measured. Results: The activities of CAT and GSH-Px were decreased as well as myeloperoxidase, NO, MDA and PC were increased in renal tissue of doxorubicin group compared with the other groups. Plasma GSH-Px activity was higher in doxorubicin plus CAPE group than the others and plasma MDA level was higher in doxorubicin group than the other groups. There were glomerular vacuolization, tubular desquamation, loss of brush border, and adhesion to Bowman's in the light microscopy in the kidneys of doxorubicin group. The tubules and brush border were almost normal and some of the glomerulus was filled with fine vacuoles in CAPE treated rats. Conclusion: Doxorubicin caused renal injury and CAPE treatment prevented lipid peroxidation and protein oxidation in renal tissue and partially preserved glomerulus and tubules. (C) 2004 Elsevier B.V. All rights reserved.Öğe Effect of fish oil supplementation on plasma oxidant/antioxidant status in rats(Churchill Livingstone, 2004) Erdogan, H; Fadillioglu, E; Ozgocmen, S; Sogut, S; Ozyurt, B; Akyol, O; Ardicoglu, OThe aim of this study was to investigate effect of dietary omega-3 fatty acid supplementation on the indices of in vivo lipid peroxidation and oxidant/antioxidant status of plasma in rats. The plasma thiobarbituric acid reactive substances (TBARS) and nitric oxide (NO) levels, and activities of xanthine oxidase (XO), superoxide dismutase (SOD) and glutathione peroxidase (GSH-PX) were studied in male Wistar Albino rats after ingestion of 0.4 g/ kg fish oil (rich in omega-3 fatty acids, eicosapentaenoic acid and docosahexaenoic acid) for 30 days and compared to untreated control rats. The rats in the treated group had significantly higher SOD activity (P < 0.001), NO levels (P < 0.01) and decreased TBARS levels (P < 0.05) with respect to controls whereas GSH-Px and XO activities were not significantly different between the groups. None of the measured parameters had significant correlation with each other in both groups. We conclude that dietary supplementation of omega-3 fatty acids may enhance resistance to free radical attack and reduce lipid peroxidation. These results support the notion that omega-3 fatty acids may be effective dietary supplements in the management of various diseases in which oxidant/antioxidant defence mechanisms are decelerated. (C) 2004 Elsevier Ltd. All rights reserved.Öğe Effects of caffeic acid phenethyl ester against doxorubicin-induced neuronal oxidant injury(Wiley, 2003) Fadillioglu, E; Erdogan, H; Iraz, M; Yagmurca, MOxygen-derived free radicals have been implicated in the pathogenesis of doxorubicin-induced toxicities. The aim of this study was to investigate the effects of caffeic acid phenethyl ester (CAPE), an antioxidant agent, on doxorubicin-induced neuronal oxidative injury in rats. The rats were treated with CAPE (10 mumol/kg/day i.p.) or saline starting 2 days before a single dose of doxorubicin (20 mg/kg i.p.) or saline. Ten days after the first experiments, the brain was excised to analyze the activities of antioxidant enzymes and levels of malondialdehyde (MDA) and nitric oxide (NO). Doxorubicin alone resulted in higher MDA level in brain tissue than the other groups. The activity of catalase was higher in doxorubicin plus CAPE group than doxorubicin group. There were no significant differences in NO level, glutathione peroxidase (GSH-Px) and superoxide dismutase activities between the groups. There were negative correlations between GSH-Px activity and MDA level in both doxorubicin and doxorubicin plus CAPE groups. It can be concluded that doxorubicin induced oxidant injury can be prevented by CAPE treatment through its antioxidant properties in rat brain.Öğe Effects of caffeic acid phenethyl ester and alpha-tocopherol on reperfusion injury in rat brain(Wiley, 2003) Irmak, MK; Fadillioglu, E; Sogut, S; Erdogan, H; Gulec, M; Ozer, M; Yagmurca, MOxygen-derived free radicals have been implicated in the pathogenesis of cerebral injury after ischaemia-reperfusion. Caffeic acid phenethyl ester (CAPE), an active component of propolis extract, exhibits antioxidant properties. The purpose of the present study was to investigate the effects of ischaemia and subsequent reperfusion on rat brain and to investigate the effects of two free radical scavengers, CAPE and alpha-tocopherol, on this in vivo model of cerebral injury. Ischaemia was induced by bilateral occlusion of the carotid arteries for 20 min and reperfusion was achieved by releasing the occlusion to restore the circulation for 20 min. Control rats underwent a sham operation. CAPE at 10 mumol kg(-1) or alpha-tocopherol at 25 mumol kg(-1) was administered intraperitoneally before reperfusion. Reperfusion led to significant increase in the activity of xanthine oxidase and higher malondialdehyde levels in the brain. Acute administration of both CAPE and alpha-tocopherol suppressed ischaemia-reperfusion-induced cerebral lipid peroxidation and injury, but CAPE seems to offer a better therapeutic advantage over alpha-tocopherol. Copyright (C) 2003 John Wiley Sons, Ltd.Öğe Effects of electromagnetic radiation from a cellular telephone on the oxidant and antioxidant levels in rabbits(Wiley, 2002) Irmak, MK; Fadilloglu, E; Güleç, M; Erdogan, H; Yagmurca, M; Akyol, ÖThe number of reports on the effects induced by electromagnetic radiation (EMR) in various cellular systems is still increasing. Until now no satisfactory mechanism has been proposed to explain the biological effects of this radiation. Oxygen free radicals may play a role in mechanisms of adverse effects of EMR. This study was undertaken to investigate the influence of electromagnetic radiation of a digital GSM mobile telephone (900 MHz) on oxidant and antioxidant levels in rabbits. Adenosine deaminase, xanthine oxidase, catalase, myeloperoxidase, superoxide dismutase (SOD) and glutathione peroxidase activities as well as nitric oxide (NO) and malondialdehyde levels were measured in sera and brains of EMR-exposed and sham-exposed rabbits. Serum SOD activity increased, and serum NO levels decreased in EMR-exposed animals compared to the sham group. Other parameters were not changed in either group. This finding may indicate the possible role of increased oxidative stress in the pathophysiology of adverse effect of EMR. Decreased NO levels may also suggest a probable role of NO in the adverse effect. Copyright (C) 2002 John Wiley Sons, Ltd.Öğe Effects of erdosteine treatment against doxorubicin-induced toxicity through erythrocyte and plasma oxidant/antioxidant status in rats(Academic Press Ltd- Elsevier Science Ltd, 2003) Fadillioglu, E; Erdogan, HThe clinical use of doxorubicin (Dxr), an antineoplastic agent, is limited by its extensive toxicity which is mostly mediated by oxidant injury. We have studied the effect of erdosteine. a mucolytic drug showing antioxidant properties, in preventing Dxr-toxicity to improve future Dxr therapy. Male Sprague-Dawley rats were divided into four groups. The first group that underwent no medication was accepted as control groups the second group was treated with a single i.p. injection of Dxr (20 mg kg(-1) bwt.); the third group was treated with oral erdosteine alone (10 mg kg(-1) b.wt. day(-1) for 12 days): and in the last group erdosteine was administered starting before Dxr injection for 12 days. The thiobarbituric acid reactive substances (TBARS) level of Dxr group was higher in both plasma and erythrocyte than the other groups. In plasma and erythrocyte. the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were increased in Dxr plus erdosteine group in comparison with control group, and the activities of GSH-Px were increased in Dxr plus erdosteine group in comparison with Dxr group. The erythrocyte catalase (CAT) activity of Dxr plus erdosteine group was higher than control and Dxr groups. Plasma xanthine oxidase activities and nitric oxide (NO) levels were not significantly different between groups. however erythrocyte NO level of Dxr group was higher than control, In conclusion. Dxr administration resulted in increased lipid peroxidation in plasma as well as erythrocyte and erdosteine treatment helped to prevent oxidative injury by increasing antioxidant enzymes, especially SOD. GSH-Px and CAT, in rats. (C) 2003 Elsevier Science Ltd. All rights reserved.Öğe Effects of Ginkgo biloba on plasma oxidant injury induced by bleomycin in rats(Sage Publications Inc, 2006) Erdogan, H; Fadillioglu, E; Kotuk, M; Iraz, M; Tasdemir, S; Oztas, Y; Yildirim, ZBleomycin is an anti-neoplastic agent and its clinical usage is limited by its toxicity, which is mostly induced by oxygen radicals. The aim of this study was to investigate the effect of Ginkgo biloba on plasma indices of oxidants induced by bleomycin in rats. Male Sprague-Dawley rats were divided into five groups: none medicated or 0.9% NaCl injected or only Ginkgo biloba (orally, 100 mg/kg per day for 14 days) or only a single dose of bleomycin (intratracheal, 2.5 U/kg) or Gingko biloba and bleomycin-treated groups. After 14 days, blood was taken before the rats were sacrificed. The plasma was removed and stored at -85 degrees C until the study day. Plasma superoxide dismutase ( SOD), glutathione peroxidase (GSH-Px) and xanthine oxidase (XO) enzyme activities with malondialdehyde and nitric oxide ( NO) levels were studied. The levels of malondialdehyde and NO with activity of XO were higher in plasma of bleomycin group than the other groups (P < 0.05). The activities of SOD and GSH-Px were increased in the bleomycin plus Gingko biloba group in comparison with the bleomycin group (P < 0.05). There was a positive correlation between malondialdehyde and NO levels in the bleomycin group (r = 0.859, P < 0.05). There were positive correlations between SOD and GSH-Px activities (r < 0.760, P < 0.05) and between XO activity and malondialdehyde level (r < 0.822, P < 0.05) in the bleomycin plus Gingko biloba group. In conclusion, it was thought that bleomycin induced oxidative stress can be prevented by Gingko biloba treatment via high anti-oxidant enzyme activity together with decreased radical production from XO.Öğe Erdosteine prevents doxorubicin-induced cardiotoxicity in rats(Academic Press Ltd- Elsevier Science Ltd, 2003) Yagmurca, M; Fadillioglu, E; Erdogan, H; Ucar, M; Sogut, S; Irmak, MKThe clinical use of doxorubicin (Dxr) is limited by its cardiotoxic effects which are mediated by oxygen radicals. The purpose of this study was to investigate in vivo protective effects of erdosteine, an antioxidant agent because of its secondary active metabolites in vivo, against the cardiotoxicity induced by Dxr in rats. Three groups of male Sprague-Dawley rats (60 days old) were used. Group I was untreated group used as control; the other groups were treated with Dxr (single i.p. dosage of 20 mg kg(-1) b.wt.) or Dxr plus erdosteine (10 mg kg(-1) day(-1), orally), respectively. Erdosteine or oral saline treatment was done starting 2 days before Dxr for 12 days. The analyses were done at the 10th day of Dxr treatment. The protein carbonyl content, the activities of myeloperoxidase, aspartate aminotransferase (AST), lactate dehydrogenase (LDH), and creatine kinase (CK) as well as heart rate and blood pressures were significantly increased in Dxr group in comparison with the other groups. However, pulse pressure was decreased in Dxr group. The body and heart weights were decreased in both Dxr administered groups in comparison with control group. Disorganization of myocardial histology, picnotic nuclei, edema, and increase in collagen content around vessels were seen in the slides of Dxr group, whereas normal myocardial microscopy was preserved in Dxr plus erdosteine group. Collectively, these in vivo hemodynamic, enzymatic and morphologic studies provide an evidence for a possible prevention of cardiac toxicity in Dxr-treated patients. (C) 2003 Elsevier Ltd. All rights reserved.Öğe Ginkgo biloba inhibits bleomycin-induced lung fibrosis in rats(Academic Press Ltd- Elsevier Science Ltd, 2006) Iraz, M; Erdogan, H; Kotuk, M; Yagmurca, M; Kilic, T; Ermis, H; Fadillioglu, EOxidative stress has been implicated in the pathogenesis of bleomycin-induced lung fibrosis and many antioxidant agents have been studied for prevention and treatment of the disease in animals and humans. We therefore examined whether Ginkgo biloba (Gb), a flavonoid-rich antioxidant, inhibits bleomycin-induced lung fibrosis in rats. Male Spraque-Dawley rats were given a single dose of bleomycin (2.5 mg/kg, intratracheally) in pulmonary fibrosis groups and saline in controls. First dose of Gb was given a day before the bleomycin injection and continued until sacrifice. At day 14, fibrotic changes in lung were estimated to occur by Aschoft's criteria and lung hydroxyproline content. Bleomycin challenge provoked severe pulmonary fibrosis with marked increase in hydroxyproline content of lung tissue and typical histological findings, which is prevented by Gb. Hydroxyproline level was significantly higher (13.51 +/- 0.87 mg/g dried tissue) in bleomycin treated rats than controls (9.2 +/- 1.33), and its level was remained to the control levels (7.38 +/- 0.76) in rats treated with prophylactic Gb. On the other hand, bleomycin injection significantly reduced activities of glutathione peroxidase, superoxide dismutase and catalase in lung tissue which is prevented by Gb. Also, bleomycin injection resulted in a marked increase of malondialdehyde and nirite level which is attenuated by Gb. The data suggest that Gb has a potent antioxidant activity in the model of bleomycin-induced lung fibrosis in rats, and therefore has a potent antifibrotic activity against bleomycin-induced lung fibrosis model in rats. (c) 2006 Elsevier Ltd. All rights reserved.Öğe In vivo effect of celecoxib and tenoxicam on oxidant/anti-oxidant status of patients with knee osteoarthritis(Assoc Clinical Scientists, 2005) Ozgocmen, S; Ardicoglu, O; Erdogan, H; Fadillioglu, E; Gudul, HThe aim of this study was to compare the in vivo effects on free radical metabolism of 2 nonsteroidal anti-inflammatory drugs (NSAIDs): tenoxicam, an oxicam preferentially cyclooxygenase-1 (COX1) inhibitor, and celecoxib, a sulfonamide selective COX-2 inhibitor. The serum levels of oxidative stress-related enzymes (ie, xanthine oxidase (XO), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px)), of a lipid peroxidation marker (malondialdehyde (MDA)), and of nitric oxide (NO) in patients with knee osteoarthritis were studied at baseline and after a 4-wk course of treatment with celecoxib (n = 11) and tenoxicam (n = 12). Celecoxib-treated patients had significant decrease in nitrite levels (p = 0.043), whereas SOD, XO, GSH-Px enzyme activities, and MDA levels did not change significantly compared to baseline. Tenoxicam-treated patients had significant decrease in nitrite levels (p = 0.036) and XO activity (p = 0.01), but their SOD, GSH-Px enzyme activities, and MDA levels were unchanged from baseline. There was significant correlation between the patients' (n = 23) Western Ontario and McMaster Universities (WOMAC) LK3.0 Osteoarthritis Index, WOMAC-pain scores, and MDA levels (r = 0.50, p = 0.014) and the patients' WOMAC-stiffness scores and XO enzyme activity (r = 0.46, p = 0.027) at baseline. Significant improvement was found in pain-VAS, patients' global assessment, and WOMAC pain, stiffness, and physical function scores in celecoxib and tenoxicam- treated groups. In summary, our study revealed that tenoxicam may have antioxidant effects, and that celecoxib and tenoxicam may reduce nitrite levels, indicating an alteration of NO pathways.Öğe Omega-3 essential fatty acid supplementation and erythrocyte oxidant/antioxidant status in rats(Assoc Clinical Scientists, 2005) Iraz, M; Erdogan, H; Ozyurt, B; Ozugurlu, F; Ozgocmen, S; Fadillioglu, EFish oil contains large amounts of essential omega-3 fatty acids, such as eicosapentaenoic and docosahexaneoic acids, which are building structures of cell membranes. The goal of this study was to elucidate the effects of dietary omega-3 fatty acid supplementation on the oxidant/antioxidant status of erythrocytes in rats. The malondialdehyde (MDA) and nitric oxide (NO) levels and the catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GSH-PX) activities were assayed in erythrocytes of male Wistar albino rats after 30 days of dietary supplementation with fish oil (0.4 g/kg/day). Erythrocyte CAT activity in the treated group was increased in comparison with the control group. Erythrocyte MDA and NO levels were lower in the treated group than the controls. Erythrocyte GSH-Px and SOD activities did not differ significantly in the 2 groups. Negative correlations were found between SOD and CAT activities, and between SOD and GSH-Px activities in the treated group. In conclusion, omega-3 fatty acid supplementation helps to prevent lipid peroxidation and to safeguard erythrocytes from oxidative injury. Dietary supplementation with omega-3 fatty acids might possibly protect tissues from oxygen free radical injury in the various diseases in which the oxidant/antioxidant defense mechanisms are disturbed.Öğe Preventive effect of melatonin on bleomycin-induced lung fibrosis in rats(Wiley, 2006) Yildirim, Z; Kotuk, M; Erdogan, H; Iraz, M; Yagmurca, M; Kuku, I; Fadillioglu, EOxidative stress has an important role in the pathogenesis of idiopathic pulmonary fibrosis. Melatonin has direct and indirect free radical-detoxifying activity. The present study investigated whether melatonin treatment attenuates bleomycin-induced lung fibrosis in rats. A group of rats was given one dose of bleomycin while the control animals were given saline. The first dose of melatonin (4 mg/kg/day) was given 2 days before the bleomycin injection. At day 14, fibrotic changes were evaluated using Aschoft's criteria and lung hydroxyproline content. Bleomycin produced a 2.7-fold rise in the fibrosis score that was decreased 65% by melatonin (P < 0.05) and a 1.4-fold increase in hydroxyproline content which was completely prevented by melatonin. Protein carbonyl and thiobarbituric acid reactive substances levels, which were significantly elevated in the bleomycin treated rats, were significantly attenuated by melatonin. Bleomycin administration significantly reduced the activities of catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) in lung tissue. The reduction in CAT activity was prevented by melatonin but SOD and GSH-Px were not influenced. These results revealed that melatonin may prevent the development of bleomycin-induced lung fibrosis via the repression of protein and lipid peroxidation.Öğe Protective effects of caffeic acid phenethyl ester on doxorubicin-induced cardiotoxicity in rats(Wiley, 2004) Fadillioglu, E; Oztas, E; Erdogan, H; Yagmurca, M; Sogut, S; Ucar, M; Irmak, MKThe prevention of doxorubicin (DXR)-induced cardiotoxicity may be helpful to improve future DXR therapy. The aim of this study was to investigate the cardio-protective effects of caffeic acid phenethyl ester (CAPE), an antioxidant agent, on DXR-induced cardiotoxicity. Rats were divided into three groups and treated with saline, DXR and DXR + CAPE. Rats were treated with CAPE (10 gmol kg(-1) day(-1) i.p.) or saline starting 2 days before a single dose of DXR (20 mg kg(-1) i.p.). Ten days later, haemodynamic measurements were performed and the hearts were excised for biochemical analyses and microscopic examination. The heart rate and mean blood pressure were higher and the pulse pressure was lower in the DXR group than in the other two groups. The administration of DXR alone resulted in higher myeloperoxidase activity, lipid peroxidation and protein carbonyl content than in the other groups. The activities of superoxide dismutase and catalase were higher in DXR and DXR + CAPE groups than in the saline group. Rats in the DXR + CAPE group had increased catalase activity in comparison with the DXR group and high glutathione peroxidase activity in comparison with the other two groups. There was severe disruption of mitochondrial fine structure in the electron microscopy of the DXR group. In contrast, myocardial microscopy appeared nearly normal in the DXR + CAPE group (as defined at the electron microscopic level). In light of these in vivo haemodynamic, enzymatic and morphological results, we conclude that CAPE pretreatment significantly attenuated DXR-induced cardiac injury, possibly with its antioxidant effects. Copyright (C) 2004 John Wiley Sons, Ltd.Öğe Protective effects of caffeic acid phenethyl ester on rotenone-induced myocardial oxidative injury(Academic Press Inc Elsevier Science, 2005) Akpinar, MB; Erdogan, H; Sahin, S; Ucar, F; Ilhan, ARotenone, an insecticide, causes toxicity through inhibition of mitochondrial electron transport chain at complex I and oxidative injury to the tissues. The aim of the present study was to determine in vivo effects of rotenone on myocardium and cardio-protective effects of caffeic acid phenethyl ester (CAPE), an antioxidant agent, against rotenone toxicity in rats. The rats were divided into three groups: untreated control, rotenone (2.5 mg/kg/day for 60 days, i.p.) and rotenone + CAPE groups. CAPE was administrated i.p. 10 ltmol/kg/day for 62 days started two days before first dose rotenone injection. The malondialdehyde, nitric oxide levels and xanthine oxidase activity of rotenone group was significantly higher than control and rotenone + CAPE groups (to < 0.05). However, catalase activity in the rotenone group was decreased in comparison with the other groups (p < 0.05). The superoxide dismutase activity of rotenone group was insignificantly decreased compared to the others. In conclusion, rotenone caused lipid peroxidation in myocardial tissue and CAPE treatment prevented this rotenone-induced lipid peroxiclation in rats. CAPE might be a cardio-protective agent against myocardial toxicities. (c) 2005 Elsevier Inc. All rights reserved.Öğe Protective effects of erdosteine against doxorubicin-induced cardiomyopathy in rats(Wiley, 2003) Fadillioglu, E; Erdogan, H; Sögüt, S; Kuku, IThe usefulness of doxorubicin (DXR) is limited by its cardiotoxicity. In order to improve future DXR therapy by using a new antioxidant agent, an experimental study was designed. This study was undertaken to determine whether DXR-induced cardiotoxicity is prevented by erdosteine, a mucolytic agent showing antioxidant properties. Three groups of male Sprague-Dawley rats (60 days old) were used: one group was untreated as a control; the other groups were treated with DXR (single i.p. dosage of 20 mg kg(-1) body wt.) or DXR plus erdosteine (10 mg kg(-1) day(-1), orally), respectively. The DXR treatment without erdosteine increased antioxidant enzyme activities and also increased lipid peroxidation in myocardial tissue. The rats treated with DXR plus erdosteine produced a significant decrease in lipid peroxidation in comparison with control and DXR groups. Furthermore, erdosteine administration led to an increase in antioxidant enzyme activities in comparison with the control group. Erdosteine treatment also increased the activities of catalase (CAT) and glutathione peroxidase (GSH-Px) in comparison with the DXR group. There was no significant difference in lipid peroxidation of myocardial tissue between control and DXR plus erdosteine-treated rats. It was concluded that erdosteine caused an increase in the activities of antioxidant enzymes, especially GSH-Px and CAT, protecting the heart tissue sufficiently from oxidative damage to membrane lipids and other cellular components induced by DXR. Copyright (C) 2003 John Wiley Sons, Ltd.Öğe Protein oxidation and lipid peroxidation after renal ischemia-reperfusion injury(Springer, 2006) Erdogan, H; Fadillioglu, E; Yagmurca, M; Uçar, M; Irmak, MKOxygen radicals have roles in the renal ischemia-reperfusion (IR) injury usually encountered in several conditions such as renal transplantation. The aim of this study was to investigate the effects of erdosteine and N-acetylcysteine (NAC) on the oxidant/antioxidant status and microscopy of renal tissues after IR injury. Male Sprague-Dawley rats were randomly assigned to four groups: control untreated rats, IR (30 min ischemia and 120 min reperfusion), IR + NAC (i.p.; 180 mg/kg) and IR + erdosteine (oral; 50 mg/kg/day for 2 days before experiments) groups. After unilateral renal IR, the right kidney was rapidly excised and sectioned vertically into two pieces for microscopic examination and biochemical analysis. Erdosteine and NAC treatment did not cause any significant change in the activity of superoxide dismutase (SOD) in comparison with the IR group, even if the SOD activity increased in IR groups than in the control group. Catalase (CAT) activity was decreased in the IR group in comparison with control and IR + erdosteine groups (P < 0.05), whereas it was higher in the IR + erdosteine group than in the IR + NAC group (P < 0.05). Xanthine oxidase (XO) activity was higher in all the IR-performed groups than in the control group (P < 0.05). Thiobarbituric acid-reactive substances (TBARS) level and protein carbonyl (PC) content were increased after IR injury (P < 0.05). Erdosteine or NAC treatments ameliorated these increased TBARS and PC contents in comparison with the IR group (P < 0.05). Light microscopy of the IR group showed tubular dilatation, tubular necrosis and vacuole formation in epithelial cells. Erdosteine but not NAC apparently reduced the renal tissue damage. The pathological damage score after IR was significantly reduced after erdosteine treatment (P < 0.05), but not after NAC treatment. In conclusion, renal IR resulted in oxidative damage as seen in biochemical lipid peroxidation and protein oxidation results with aggravated tubular necrosis. Erdosteine and NAC treatments improved the biochemical results of IR injury. However, on microscopic evaulations, animals receiving erdosteine showed a great reduction in renal damage when compared with the NAC group.Öğe Renal antioxidant status in rats with hypertension induced by N sup omega nitro-L-arginine methyl ester(Karger, 2002) Fadillioglu, E; Erdogan, H; Polat, A; Emre, MHNitric oxide (NO) has a role in the etiopathogenesis of hypertension. Relaxation of vascular smooth muscles is failed when NO production is reduced leading to increased vascular peripheral resistance. N sup omega nitro-L-arginine methyl ester (L-NAME) is one of the inhibitors of NO production. The aim of this study was to investigate oxidant-antioxidant systems of renal tissue in rats with hypertension induced by L-NAME. Rats were divided into three groups: control group and study groups treated with 100 or 500 mg/l L-NAME in drinking water for 15 days. The activities of catalase (CAT), glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD), and the levels of malondialdehyde (MDA) and NO were studied in the renal tissue after hypertension induction. Arterial blood pressure was increased in both L-NAME groups. CAT activity of 500-mg L-NAME group was higher than control. GSH-Px activity of 500-mg L-NAME group was decreased compared with 100-mg ones. NO level was lower in 500-mg L-NAME group than control. MDA levels in both L-NAME groups were decreased compared with control. In conclusion, hypertension was induced with oral L-NAME treatment. Increased CAT activity was compensated with decreased GSH-Px activity in 500-mg L-NAME group. Both study groups were protected from lipid peroxidation with NO inhibition.Öğe Serum selenium response to maximal anaerobic exercise among sportsmen trained at various levels(Wiley-Liss, 2004) Emre, MH; Düzova, H; Sancak, B; Polat, A; Erdogan, H; Yologlu, SSerum selenium (Se) is a constitutional part of both major plasma selenoprotein P and glutathione peroxidase (GSH-Px), a cytoprotective enzyme against the oxidative damage. It is an accepted fact that any case related to oxidative stress increased by physical exercise changes serum Se levels. In this Study serum Se levels were examined in high physical activity (group I). moderate physical activity (group II), and low physical activity (group III) mates undertaking a soccer-training regimen. In addition, Se changes before and after the acute intensive maximal exercise in an anaerobicloading coordination tests among groups I, II, and III soccer players were investigated. For a minimum of 3 months, the players in group I (n = 12), exercising more than 5 It a week. group II (n = 9), exercising less than 5 h but more than 2 h a week, and group III (n = 11), exercising regularly or irregularly less than 2h were examined. Heart rate monitor 220 (heart rate)-age formula wits used to evaluate the maximal exercising test during the procedure. Serum Se was analyzed by atomic absorption spectrophotometry. The difference between groups before and after the exercise was tested by Wilcoxon test, and the difference varying in the groups was tested by Kruskal-Wallis variance analyse. The relation between heart rate and serum Se was tested by Sperman's rank correlation analyses. After maximal physical exercise, the serum selenium level decreased significantly compared with pre-exercise values (P < 0.05) in group I only. III group 1, maximal and pre-exercise heart rates as opposed to pre- and post-exercise serum Se level were negative correlated (P < 0.05). In conclusion, a nutrition regime rich in selenium may be beneficial for both athletes who exercise regularly and in patients with increasing oxidative stress. (C) 2004 Wiley-Liss. Inc.Öğe Synthesis of some new pyridylethylated benzoxa(thia)zolinones with analgesic activitiy(Tubitak Scientific & Technological Research Council Turkey, 2004) Gökhan, N; Aktay, G; Erdogan, HEighteen new 3-[2-(2-/4-pyridyl)ethyl]benzoxlinone(benzothiazolinone) derivatives were synthesized by reacting 2-/4-vinylpyridine and appropriate benzoxazolinones and benzothiazolinones. The analgsic activities of these compounds were investigated by modified Koster and hot-plate tests. Test results revealed that most of the compounds at 100 mg/kg dose levels have higher analgestic activities than acetylisalicylic acid. Compounds with bromo substituents on the phenyl ring in the 6-position of the main ring seemed to show less activity than those with fluorinated ones. Compound 6b showed remarkably high activity in the hot-plate test, although it was inactive in the Koster test. However compound 3a had statistically significant high peripheral analgesic activity at all doses compared to other compounds, although it was inactive in the hot-plate test.
