Bacanli M. | Aydin S. | Bucurgat U.U. | Başaran N. | Anlar H.G. | Çal T. | Ari N.

Makale | 2018 | Turkish Journal of Biochemistry43 ( 5 ) , pp.520 - 529

Objective: Diabetes mellitus, a heteregenous metabolic and chronic disease, is a growing health problem especially in developing countries. It is claimed that diabetes associated with increased formation of free radicals and decrease in antioxidant potential and also alterations in lipid profile and enzyme levels. Ursolic acid is commonly used in traditional Chinese medicine due to its beneficial effects. The aim of this study was to investigate the effects of ursolic acid on streptozotocin-induced diabetes in Wistar albino rats. Methods: DNA damage was evaluated in the blood and liver cells of rats by alkaline comet assay. The acti . . .vities of antioxidant enzymes, oxidative stress parameters, biochemical parameters, hepatic enzyme levels and lipid profile parameters were also evaluated. Results: The results of this study demonstrate that diabetes caused genotoxic damage, changes in hepatic enzyme and lipid profile, biochemical and antioxidant enzyme activities and oxidative stress parameters in rats. Ursolic acid was found to be protective against diabetes induced effects in blood and liver samples of rats. Conclusions: According to our results, it seems that ursolic acid may be beneficial against diabetes and its adverse effects in rats. © 2018 Turkish Biochemistry Society. All rights reserved Daha fazlası Daha az

Coskun O. | Kanter M. | Korkmaz A. | Oter S.

Makale | 2005 | Pharmacological Research51 ( 2 ) , pp.117 - 123

The aim of the present study was the evaluation of possible protective effects of quercetin (QE) against ß-cell damage in experimental streptozotocin (STZ)-induced diabetes in rats. STZ was injected intraperitoneally at a single dose of 50 mg kg -1 for diabetes induction. QE (15 mg kg -1 day, intraperitoneal (i.p.) injection) was injected for 3 days prior to STZ administration; these injections were continued to the end of the study (for 4 weeks). It has been believed that oxidative stress plays a role in the pathogenesis of diabetes mellitus (DM). In order to determine the changes of cellular antioxidant defense system, antioxidant . . . enzymes such as glutathione peroxidase (GSHPx), superoxide dismutase (SOD) and catalase (CAT) activities were measured in pancreatic homogenates. Moreover we also measured serum nitric oxide (NO) and erythrocyte and pancreatic tissue malondialdehyde (MDA) levels, a marker of lipid peroxidation, if there is an imbalance between oxidant and antioxidant status. Pancreatic ß-cells were examined by immunohistochemical methods. STZ induced a significant increase lipid peroxidation, serum NO concentrations and decreased the antioxidant enzyme activity. Erythrocyte MDA, serum NO and pancreatic tissue MDA significantly increased (P < 0.05) and also the antioxidant levels significantly decreased (P < 0.05) in diabetic group. QE treatment significantly decreased the elevated MDA and NO (P < 0.05), and also increased the antioxidant enzyme activities (P < 0.05). QE treatment has shown protective effect possibly through decreasing lipid peroxidation, NO production and increasing antioxidant enzyme activity. Islet cells degeneration and weak insulin immunohistochemical staining was observed in STZ induced diabetic rats. Increased staining of insulin and preservation of islet cells were apparent in the QE-treated diabetic rats. These findings suggest that QE treatment has protective effect in diabetes by decreasing oxidative stress and preservation of pancreatic ß-cell integrity. © 2004 Elsevier Ltd. All rights reserved Daha fazlası Daha az

Coskun O. | Ocakci A. | Bayraktaroglu T. | Kanter M.

Makale | 2004 | Tohoku Journal of Experimental Medicine203 ( 3 ) , pp.145 - 154

The aim of the present study was the evaluation of possible protective effects of exercise against ß-cell damage in streptozotocin (STZ)-induced diabetes in rats. The animals were divided into five groups: the control group, the STZ-induced diabetes group, the STZ-induced diabetes and light-intensity exercise group, the STZ-induced diabetes and moderate-intensity exercise group, and the STZ-induced diabetes and heavy-intensity exercise group. Animals in the exercise groups were made to swim one of three exercise protocols once a day for 12 consecutive weeks. STZ was injected intraperitoneally at a single dose of 50 mg/kg for diabete . . .s induction. Exercise training was continued for 4 weeks prior to STZ administration; these applications were continued end of the study (for 12 weeks). Erythrocyte and pancreatic tissue malondialdehyde (MDA) levels and serum nitric oxide (NO) concentration were measured. Moreover glutathione peroxidase (GSHPx), superoxide dismutase (SOD) and catalase (CAT) were also measured in pancreatic homogenates. Pancreatic ß-cells were examined by immunohistochemical methods. STZ increased lipid peroxidation and decreased the antioxidant enzyme activity significantly. Exercise, especially moderate-intensity exercise has shown protective effect probably through decreasing lipid peroxidation and increasing antioxidant enzyme activity. Islet cell degeneration and weak insulin immunohistochemical staining were observed in STZ induced diabetic rats. Increased intensity of staining for insulin and preservation of ß-cell numbers were apparent in the exercise-applied diabetic rats. Interestingly, the best result was obtained from moderate-intensity exercise. These findings suggest that exercise has a therapeutic and/or protective effect in diabetes by decreasing oxidative stress and preservation of pancreatic ß-cell integrity. © 2004 Tohoku University Medical Press Daha fazlası Daha az

Fadillioglu E. | Kurcer Z. | Parlakpinar H. | Iraz M. | Gursul C.

Makale | 2008 | Archives of Pharmacal Research31 ( 6 ) , pp.705 - 712

Oxidative stress may have a role in liver damage after acute renal injury due to various reasons such as ischemia reperfusion (IR). Diabetes mellitus (DM) is an important disease for kidneys and may cause nephropathy as a long term complication. The aim of this study was to investigate protective effect of melatonin, a potent antioxidant, against distant organ injury on liver induced by renal IR in rats with or without DM. The rats were divided into six groups: control (n=7), DM (n=5), IR (n=7), DM+IR (n=7), melatonin+IR (Mel+IR) (melatonin, 4 mg/ kg during 15 days) (n=7), and Mel+DM+IR groups (n=7). Diabetes developed 3 days after . . .single i.p. dose of 45 mg/kg streptozotocin. After 15 day, the left renal artery was occluded for 30 min followed 24 h of reperfusion in IR performed groups. DM did not alter oxidative parameters alone in liver tissue. The levels of malondialdehyde, protein carbonyl and nitric oxide with activities of xanthine oxidase and myeloperoxidase were increased in liver tissues of diabetic and non-diabetic IR groups. Nitric oxide level in DM was higher than control. The activities of catalase and superoxide dismutase were increased in IR groups in comparison with control and DM. ALT and AST levels were higher in IR and DM+IR groups than control and DM. Melatonin treatment reversed all these oxidant and antioxidant parameters to control values as well as serum liver enzymes. We concluded that renal IR may affect distant organs such as liver and oxidative stress may play role on this injury, but DM has not an effect on kidney induced distant organ injury via oxidant stress. Also, it was concluded that melatonin treatment may prevent liver oxidant stress induced by distant injury of kidney IR. © 2008 The Pharmaceutical Society of Korea Daha fazlası Daha az

Aydın S. | Bacanlı M. | Anlar H.G. | Çal T. | Arı N. | Ündeğer Bucurgat Ü. | Başaran A.A.

Makale | 2019 | Food and Chemical Toxicology124 , pp.54 - 63

Diabetes mellitus, a complex progressive metabolic disorder, leads to some oxidative stress related complications. Pycnogenol ® (PYC), a plant extract obtained from Pinus pinaster, has been suggested to be effective in many diseases including diabetes, cancer, inflammatory and immune system disorders. The mechanisms underlying the effects of PYC in diabetes need to be elucidated. The aim of this study was to determine the effects of PYC treatment (50 mg/kg/day, orally, for 28 days) on the DNA damage and biochemical changes in the blood, liver, and kidney tissues of experimental diabetic rats. Changes in the activities of catalase, s . . .uperoxide dismutase, glutathione peroxidase, glutathione reductase, and glutathione-S-transferase enzymes, and the levels of 8-hydroxy-2'-deoxyguanosine, total glutathione, malondialdehyde, insulin, total bilirubin, alanine aminotransferase, aspartate aminotransferase, gamma-glutamyl transferase, high density lipoprotein, low density lipoprotein, total cholesterol, and triglyceride were evaluated. DNA damage was also determined in the whole blood cells and the liver and renal tissue cells using the alkaline comet assay. PYC treatment significantly ameliorated the oxidative stress, lipid profile, and liver function parameters as well as DNA damage in the hyperglycemic rats. The results show that PYC treatment might improve the hyperglycemia-induced biochemical and physiological changes in diabetes. © 201 Daha fazlası Daha az

Yagci R. | Gürel A. | Ersöz I. | Keskin U.C. | Hepşen I.F. | Duman S. | Yigitoglu R.

Makale | 2006 | Current Eye Research31 ( 12 ) , pp.1029 - 1032

Purpose: To investigate the oxidant/antioxidant status and protein oxidation in pseudoexfoliation syndrome. Methods: The activity of serum superoxide dismutase (SOD) and the levels of serum malondialdehyde (MDA) and protein carbonyl (PC) were measured in 50 patients with pseudoexfoliation (PEX) and in 55 healthy controls. Results: There was significant difference in the SOD activity in PEX group compared with the control group (p < 0.001). In addition, MDA and PC levels were significantly higher in patients than in the controls (p < 0.001). Conclusions: Decrease in SOD activity and the higher levels of MDA and PC indicate increased . . .oxidative stress. Our results suggest a possible role of oxidative stress in pathology of PEX syndrome. Copyright © Informa Healthcare Daha fazlası Daha az

Yildiz G. | Aydin H. | Magden K. | Yilmaz A. | Hür E. | Candan F.

Makale | 2014 | Minerva Medica105 ( 1 ) , pp.79 - 87

Aim. Chronic kidney disease(CKD) and hemodialysis (HD) are associated with increased oxidative stress. Cardiovascular diseases (CVD) are the most important cause of mortality in these patients. Increased cardiovascular risk is associated with oxidative stress. The aim of this study was to evaluate whether the duration of single session hemodialysis may affect oxidative stress parameters on the patients with end-stage renal disease (ESRD). Methods. Total oxidant status (TOS) and oxidative stress index (OSI) as oxidative markers and total antioxidant status (TAOS), paraoxonase1 (PON1) and arylesterase (ARES) as antioxidant markers wer . . .e compared hemodialysis therapy before and after the treatment. Results. TOS levels before hemodialysis were found as 4.4±2.4 µmol H2O2 Equiv/L, TAOS 2.1±0.3 µmol trolox Equiv./L, OSI 0.2±0.1%, PON1 levels 58.5±35.6 U/L and ARES levels 22±0.2 U/L while after the HD the respective values were 1.4±1.2 µmol H2O2 Equiv/L, 1.4±0.5 µmol trolox Equiv./L, 0.1±0.1%, 54.3±31.3 U/L, 21.8±0.1 U/L. A significant decreasing was observed in TOS TAOS OSI and ARES values before the HD compared to after the HD (P=0.0001, P=0.0001, P=0.0001, P=0.031, respectively). Conclusion. This study shows oxidant (TOS, OSI) and antioxidant (TAOS, ARES) markers were found to be significantly decrease after the HD compared to pre-hemodialysis. Although reverse is expected it is found that oxidants (indirectly ROS) did not increase and antioxidant reserve decreased in HD Daha fazlası Daha az

Kurkcu R. | Cakmak A. | Zeyrek D. | Atas A. | Karacabey K. | Yamaner F.

Makale | 2010 | Biology of Sport27 ( 3 ) , pp.177 - 180

The aim of the study was to evaluate the effects of short-term exercise on total antioxidant status (TAS), lipid hydroperoxide (LOOHs), total oxidative status (TOS) and oxidative stress index (OSI) in adolescent athletes. A total of 62 adolescent participated in the study. Athletes were trained regularly 3 days a week for 2 hours. All subjects followed a circuit exercise program. Blood samples were collected just before and immediately after the exercise program. Antioxidant status was evaluated by measuring the TAS level in the plasma. Oxidative status was evaluated by measuring the total peroxide level. The percentage ratio of TAS . . . to total peroxide level was accepted as the OSI. Plasma triglyceride, total cholesterol, LDL, HDL and VLDL were measured by automated chemical analyzer using commercially available kits.There was a significant increase in TOS ( Daha fazlası Daha az

Erdem, Salih

Master Tezi | 2020 | Zonguldak Bülent Ecevit Üniversitesi, Sağlık Bilimleri Enstitüsü, Fizyoloji Anabilim Dalı

Menopoz overlerden hormon sekresyonunun azalması veya durması ile karakterize doğal fizyolojik bir süreçtir. Depresyon ve anksiyete menopozda en sık karşılaşılan semptomlardandır. Yapılan çalışmalar depresyon patogenezinde renin-anjiyotensin-aldesteron sisteminin, oksidatif stres hasarının, nörotrofik faktörlerin ve inflamatuar sitokinlerin kritik bir rol oynadığını göstermiştir. Biz bu çalışmada anjiyotensin II tip I reseptör blokerinin menopoz kaynaklı depresyon ve anksiyete benzeri nörodavranışlar üzerine etkisini araştırmayı ve olası etki mekanizmalarını beyin dokusunda nod-benzeri reseptör protein 3, interlökin-1beta, beyin kay . . .naklı nörotrofik faktör ve beyin oksidatif stres düzeylerinin belirlenmesi ile açıklamayı amaçladık. Çalışmamızda 32 adet Wistar albino türü dişi sıçan kullanıldı ve rastgele olarak 4 grup oluşturuldu. Deneysel menopoz modeli olan overektomi grup 3 ve grup 4’deki deneklere uygulandı. Grup 4 hayvanları ondört gün süreyle 40mg/kg/gün dozda valsartan ile tedavi edildi. Deney protokolünün sonunda depresyon ve anksiyete benzeri davranışları değerlendirmek için zorlu yüzme testi ve açık alan testi yapıldı. Sıçanlardan alınan hipokampüs ve prefrontal korteks dokularında oksidatif stres, NLRP3, IL-1β, BDNF ve CREB analizleri yapıldı. Davranış testleri sonucunda depresyon ve anksiyete benzeri davranışlar overektomize sıçanlarda artış gösterirken valsartan tedavisi bu davranışları azalttığı görüldü. Overektomize sıçanların hipokampüsünde oksidatif stres, NLRP3 ve IL-1β konsantrasyonu artarken BDNF konsantrasyonu azaldı. Valsartan tedavisi oksidatif stres parametrelerini ve BDNF seviyeleri üzerine iyileştirici bir etki gösterirken, overektomi ile artan NLRP3 ve IL- 1β seviyelerini etkilemediği saptandı. Sonuç olarak anjiyotensin II tip I reseptör blokeri depresyon ve anksiyete benzeri davranış üzerinde iyileştirici etkiye sahiptir. anjiyotensin II tip I reseptör blokerinin bu terapötik etki mekanizmasında hipokampüsde oksidatif stres düzeylerinde azalma ve BDNF yapımındaki artışın rol oynadığı görülmektedir. Menopause is a natural physiological process characterized by decreased or stopped which hormone secreted from ovaries. Depression and anxiety are the most common symptoms in menopause. Studies have shown that renin-angiotensin-aldesterone system, oxidative stress damage, neurotrophic factors and inflammatory cytokines play a critical role in the pathogenesis of depression. In this study, we aimed to explain the effect of angiotensin II type I receptor blocker on menopaus-induced depression and anxiety-like neurobehavior and to possible mechanisms of action by determining the levels of nod-like receptor protein 3, interleukin-1beta, brain-derived neurotrophic factor and brain oxidative stress in brain tissue. In this study, 32 female Wistar albino rats were used and 4 groups were randomly formed. The experimental menopause model, overectomy, was applied to the subjects in group 3 and 4. Group 4 animals were treated with valsartan at a dose of 40 mg / kg / day for fourteen days. At the end of the experimental protocol, a forced swimming test and open field test were performed to assess depression and anxiety-like behaviors. Oxidative stress, NLRP3, IL-1β, BDNF and CREB were analyzed in hippocampus and prefrontal cortex tissues from rats. Behavioral tests showed that depression and anxiety-like behaviors increased in ovariectomized rats, whereas valsartan treatment decreased these behaviors. In the hippocampus of ovariectomized rats, oxidative stress, NLRP3 and IL-1β concentration increased while BDNF concentration decreased. While valsartan treatment had an improving effect on oxidative stress parameters and BDNF levels, it did not affect increased NLRP3 and IL-1β levels with OVX. As a result angiotensin II type I receptor blocker has a curative effect on depression and anxiety-like behaviors. This therapeutic action of mechanism of angiotensin II type I receptor blocker appears to play a role in reduction of oxidative stress level and increase in BDNF production in the hippocampus Daha fazlası Daha az

Koksal M. | Oguz E. | Baba F. | Eren M.A. | Ciftci H. | Demir M.E. | Kurcer Z.

Gözden Geçirme | 2012 | European Review for Medical and Pharmacological Sciences16 ( 5 ) , pp.582 - 588

Background: Testicular torsion due to oxidative stress results in infertility and testicular damage which can be preventable an important health problem worldwide. Aim: The purpose of the present study was to investigate the changes of malondialdehyde (MDA), total antioxidant status (TAS), total oxidant status (TOS) levels; histopathological alterations; morphology, concentration and motilities of the sperm in post ischemic reperfused (I/R) testis tissue. Materials and Methods: Forty adult male Wistar rats were carried out and were randomized to five groups; (1) Control group, (2) Ipsilateral left testis ischemia, (3) Melatonin plus . . . ipsilateral left testis ischemia, (4) Contralateral right testis ischemia, 5. Melatonin plus contralateral right testis ischemia. After 1 h ischemia and 24 h perfusion; MDA, TAS and TOS levels were measured, histopathological alterations were determined using by Johnsen's score (JS) and sperm morphology, concentration, motility were examined. Results: MDA, TAS and TOS levels of the testis tissue did not change in all groups (p < 0.05 for all). JS was decreased in I/R group and melatonin treatment reversed histopathological changes and increased JS both in ipsilateral and contralateral testis. Abnormal sperm rate significantly increased in I/R group and melatonin administration changed abnormal sperm rate to normal. Conclusions: As a result, the present study demonstrated that testicular damage occurs following I/R without an increase of MDA, TAS and TOS levels. Our results also suggested that melatonin is a potent antioxidant agent in preventing testicular I/R injury, as shown by increased JS and changed abnormal sperm rate Daha fazlası Daha az

Ozcetin M. | Katar M. | Yilmaz R. | Karaaslan E. | Ozugurlu F.

Makale | 2011 | HealthMED5 ( 5 ) , pp.1008 - 1013

Introduction: Coeliac Disease (CD) is an immune- mediated chronic inflammatory disease of upper small intestine in genetically permanent gluten-sensitive individuals. Oxidative stress was reported to play an important role in the pathogenesis of coeliac disease. The aim of this study was to investigate the frequency of the polimorphisms in the structures of the enzymes SOD and GSHPx with changing levels depending on increased oxidative stress and whether there is an association with the mutations DQA1*0501, DQB1*0201, DRB1*04 reported frequently in coeliac disease. Methods: This study has investigated SOD and GSH-PX polymorphisms an . . .d the frequently reported mutations DQA1*0501, DQB1*0201 and DRB1*04 in the patients with CD. Height and weight measurements of the patients were obtained to evaluate their growth and development, also correlation between polymorphisms SOD and GSH-PX and concerned mutations were investigated. Results: This study involved total 56 cases, 35 female (62.5%) and 21 male (37.5%), with a mean age 6.66 ± 4.18 years. Polymorphisms SOD and GSH-PX were found in homozygote, heterozygote and wild-type patients. At least one of the mutations DQA1*0501, DQB1*0201 and DRB1*04 were found in 41 patients. Conclusion: Although etiology of coeliac disease is not entirely clear, many mechanisms have been suggested. It may be observed that the retardation of growth and development in the patients with coeliac disease may be associated with oxidative stress and decreased antioxidant capacity Daha fazlası Daha az

Hekimoglu A. | Bilgin H.M. | Kurcer Z. | Ocak A.R.

Makale | 2010 | Archives of Gynecology and Obstetrics281 ( 1 ) , pp.23 - 28

Purpose: The relationship between increasing ratio of progesterone in estrogen/progesterone combination and oxidative stress (OS) was investigated. Methods: Thirty non-pregnant Wistar Albino female rats were divided into five groups and bilaterally ovariectomized (Ovx) except sham group. Groups: Sham + 0.3 cc seaseme oil, Ovx + 0.3 cc seaseme oil, Ovx + estradiol propionate (E2) (1 µg/kg), Ovx + E2 + medroxyprogesterone acetate (MPA) 1 mg/kg, Ovx + E2 + MPA 20 mg/kg. Hormones were applied for three consecutive days after 28 days of ovariectomy. Their uteri and blood samples were collected and nitric oxide (NO), malondialdehyde (MDA) . . ., total oxidative status (TOS) and total antioxidant capacity (TAC) levels were determined. Results: E2 + MPA1 treatment decreased NO, MDA and TOS levels and increased TAC levels in uterus. Plasma NO levels elevated in all groups and MDA production increased due to E2 treatment when compared to ovariectomy. E2 + MPA20 treatment increased TOS levels, while TAC levels decreased when compared to ovariectomy in plasma. Conclusions: Using E2 plus low dose progesterone may prevent pathologies resourced of OS. © 2009 Springer-Verlag Daha fazlası Daha az