Oxidant Status Index Research Articles

Protective effect of alpha-lipoic acid in methotrexate-induced ovarian oxidative injury and decreased ovarian reserve in rats

To determine whether the possible oxidative effect of methotrexate (Mtx) on ovary and to evaluate the effectiveness of alpha lipoic acid (ALA), which may be useful in many oxidative stress models.Thirty-two female Wistar-albino rats were randomly divided into four groups; control group, alpha lipoic acid group (ALA 100 mg/kg, 10 days), multiple dose Mtx group (Mtx 1 mg/kg 1, 3, 5, 7 days) and Mtx and ALA group (Mtx 1 mg/kg 1, 3, 5, 7 days and ALA 100 mg/kg, 10 days). Serum total antioxidant status (TAS), total oxidant status (TOS) and oxidative stress index (OSI), tumor necrosis factor-alpha (TNF-α), tissue malondialdehyde (MDA) and activities of glutathione peroxidase (GSH-Px) and catalase (CAT) and anti-Mullerian hormone (AMH) and total ovarian follicle count were evaluated.Mtx administration caused a significant decrease in TAS, a significant increase in TOS and OSI, a significant increase in MDA levels and a decrease in GSH-Px and CAT activity. Moreover the proinflammatory cytokine (TNF-α) was increased in the Mtx group. And AMH values and total follicle count were significantly decreased in Mtx group. However, ALA treatment reversed biochemical results and AMH levels and total follicle count.Alpha lipoic acid ameliorates methotrexate induced oxidative damage of ovarian in rats.

Effects of two different lipid emulsions on morbidities and oxidant stress statuses in preterm infants: an observational study

Objective: We examined the morbidities and oxidative stress statuses in preterms receiving either SMOFlipid or ClinOleic.Study design: This observational study was performed in Etlik Zubeyde Hanim Hospital, Turkey. Infants received SMOFlipid (5 months) or ClinOleic (7 months). Two hundred and twenty seven infants (SMOFlipid: 93, ClinOleic: 134) very low birth weighted infants were included. The oxidative stress status was evaluated in infants at low risk of oxidative stress by total antioxidant capacity (TAC) and total oxidant status (TOS) and oxidative stress index (OSI; TAC/TOS/100) at baseline, first week and third week.Results: Parenteral nutrition was given for a median of 7 days in both groups. There were statistically insignificantly higher rates of retinopathy of prematurity (9.4 versus 11.7%) and chronic lung disease (4.7 versus 6.7%) in ClinOleic group compared with SMOFlipid group. The TAC, TOS and OSI decreased significantly in ClinOleic group after 1 week, and although the results were not statistically significant, the TAC increased while the TOS and OSI decreased in SMOFlipid group. In both groups, the TAC, TOS and OSI were lower than baseline after 3 weeks.Conclusion: SMOFlipid and ClinOleic result in similar oxidative stress statuses after they were stopped, and we detected no statistically significant differences in morbidity rates.

Influence of rumen-protected choline on blood red-ox potential and biochemical biomarkers of dairy cows during the transition period

The aim of this study was to determine the serum oxidative status, antioxidant capacity, and oxidative stress index, as well as aspartate aminotransferase (AST), alanine aminotransferase (ALT) and creatinine profiles, of dairy cows fed rumen-protected choline during the transition period. A total of thirty dairy cows allotted to one control and two experimental groups (10 animals per group) were fattened from 3 weeks prior to the expected calving date until 3 weeks postpartum. The control group was fed a basal diet, and treatment groups 1 and 2, were fed a basal diet containing 60 g/head/day and 120 g/head/day or rumen-protected choline, respectively. Serum total antioxidant status (TAS) levels for the control group and treatment groups 1 and 2 at the time of parturition were 0.56±0.029ab, 0.45±0.028b, and 0.59±0.036a, respectively. The differences between the groups were statistically significant (P<0.05). Rumen-protected choline supplementation did not have a significant effect on TAS levels in the third week before parturition and in the first and third weeks of lactation. There were no significant differences (P>0.05) between the groups in terms of total oxidative status (TOS), oxidative stress index (OSI) or creatinine levels. Serum ALT levels were significantly different (P<0.05) between the groups at parturition and in the first week of lactation, but not significant (P>0.05) for the other periods. In addition, the serum AST level was significantly different (P<0.05) between the groups in the first and third weeks of lactation, but not significantly different (P>0.05) for the other periods. After removing the effect of groups, time-dependent changes were significant (P<0.001) for all parameters. The highest values for TAS, TOS and OSI were obtained in the third week before parturition. The values for these parameters decreased during parturition and after the postnatal period. The lowest values for serum ALT and creatinine occurred at parturition. Rumen-protected choline supplementation did not have a significant effect on serum TAS and TOS levels during the transition period. There is a need for further studies of animals with known metabolic profiles, malnourished animals, and those with high milk yields or metabolic disorders.

Severity assessment of atopic dermatitis in children

The article is devoted to the analysis of methods to assess the degree of atopic dermatitis (AD) severity, of their clinical manifestations and laboratory diagnosis. Treatment and prognosis of atopic dermatitis depends on the assessment of disease severity. The severity of the disease is the main factor for a doctor in the therapy of a child with AD. There are many scientific studies devoted to the objective classification of diseases and the development of the most effective methods of severity assessment. It is not always possible to quickly determine objectively measurable parameters ofpathologic skin process. Because of that assessment methods of skin diseases are often approximate and subjective. The new pathogenetic data of atopic dermatitis and the main types of defects are described. Dermatology indexes of atopic dermatitis severity were considered. The new biochemical methods to assess the degree of atopic dermatitis severity in children by measuring indicators of spontaneous adhesion of neutrophils were analyzed. Immunological method, in which serum of children with atopic dermatitis is determined by the level of total IgE and IgE antibodies to allergens, with using ImmunoCAP 100 and level IgG- and IgE-antibodies against tissue antigens by ELISA, were analyzed. The indicators of oxidative status were examined. The concentration of circulating biological peroxides (PPI) and nukliozida 8-OHdG (8-hydroxy-2’-deoxyguanosine) differed significantly in mild, moderate and severe AD. Bacteriological methods, based on an integrated assessment of microbiological parameters, characterizing the nonspecific resistance of skin and mucous membranes in the assessment of severity and prognosis of atopic dermatitis in children, were performed.

Serum E3 SUMO-protein ligase NSE2 level and peroxynitrite related to oxidative stress in nephrolithiasis patients

ObjectiveTo prove probable relations between serum E3 SUMO-protein ligase NSE2 (NSMCE2) concentration, peroxynitrite related to oxidative stress in nephrolithiasis patients. MethodsA total of 60 patients with nephrolithiasis and 50 healthy volunteers were involved in this study. Colorimetric method was used to detect blood urea, creatinine, uric acid, protein, albumin, total antioxidant status, total oxidant status, peroxynitrite, nitric oxide and oxidative stress index. Glutathione, NSMCE2 and superoxide dismutase were measured by ELISA. ResultsA significant increase in level of peroxynitrite, total oxidant status, NSMCE2 and oxidative stress index in patients was observed, while total antioxidant status and glutathione were significantly decreased. ConclusionsThe study concluded that serum NSMCE2 significantly correlated with peroxynitrite and oxidative stress in patients with nephrolithiasis.

Honest Signaling and Oxidative Stress: The Special Case of Avian Acoustic Communication

Much research on animal communication has addressed how costs or constraints determined by the oxidative status of an individual can assure the honesty of visual signals, such as sexually selected color ornaments. However, acoustic communication has been largely overlooked in this respect. Here, we describe the few available studies that have considered the role of oxidative status in mediating vocal behavior in adult and nestling birds. Further, we discuss the theoretical principles of how the honesty of avian acoustic signals may be maintained by an organism’s oxidative status. We here distinguish between studies that considered songs and begging calls as indicators of oxidative status and studies where vocalizations were assumed to be the source of oxidative costs. We outline experimental and methodological issues related to the study of bird vocalizations and oxidative stress and describe opportunities for future work in this field of research. Investigating the interactions between acoustic signals and redox state may help address some unresolved questions in avian vocalization, thereby increasing our understanding of the evolutionary pressures shaping animal communication. Finally, we argue that it will be important to extend this line of research beyond birds and include other taxa as well.

Can Oxidative Stress Parameters Be Used as Biomarkers for the Discrimination of Malignant Head and Neck Tumors.

In this study the authors have investigated oxidative stress parameters in sera and tissues, and evaluated their significance for the differentiation of malignant and benign tumors. The study included 104 patients who were operated for head and neck tumors, and 45 healthy volunteers. Group 1 (n = 56) consisted of patients with malignant, Group 2 (n = 48) consisted of patients with benign tumors, and Group 3 (n = 45) was the control group. While both tissue and plasma samples were collected from groups 1 and 2, only plasma samples were collected from Group 3. Plasma and tissue levels of oxidative status were determined by using an automated measurement method. Serum analysis revealed that total oxidant status (TOS) and oxidative stress index (OSI) values of Group 1 were significantly higher than those of Groups 2 and 3, and total antioxidant status (TAS) values of Group 1 were significantly lower than those of Groups 2 and 3. TAS values of Group 2 were lower than those of Group 3, but the difference was not statistically significant. Biochemical tissue analysis revealed that TOS and OSI values of Group 1 were significantly higher than those of Group 2, while TAS values of Group 1 were significantly lower than those of Group 2. There is a significant difference between the total oxidative stress parameters of malignant and benign head and neck tumors. The authors think that total oxidative stress parameters can be used as a practical, cheap, and easy method for discriminating malignant tumors from benign tumors.

Probable preventive effects of placenta from oxidative stress; Evaluation of total antioxidant status, total oxidant status and oxidative stress index in fetal cord blood during the delivery

Depression in pregnancy may have negative effects on birth outcomes. It may also effect the intrauterine environment of the fetus. The umbilical cord is the conduit between the fetus and placenta, and functions in the transport between fetus and mother. Investigating biochemical parameters in fetal cord blood (FCB) during delivery may be helpful to understanding to what the fetus is exposed to, at least in the last trimester. In this study, we aimed to investigate total antioxidant status (TAS), total oxidant status (TOS), and oxidative stress index (OSI) in the FCB of depressed mothers and healthy controls during delivery. Our study included 33 depressed mothers and 37 healthy controls. TAS, TOS, and OSI were measured according to Erel's method. We found that TAS, TOS, and OSI levels were similar in patients and healthy controls; however, the birth weights of depressed patients were significantly lower than those of healthy controls. Our results suggest that the placental barrier may prevent from oxidative stress. Future studies should include blood samples collected simultaneously from mothers during delivery.

The impact of levothyroxine sodium treatment on oxidative stress in Hashimoto's thyroiditis.

Although several studies reported increased oxidative stress in Hashimoto's thyroiditis (HT), the effect of levothyroxine treatment on oxidative status is not studied extensively. Therefore, we conducted this study to investigate the effects of levothyroxine replacement on oxidative stress in HT. Thirty-six patients recently diagnosed with HT-related hypothyroidism and 36 healthy controls were included in the study. Levothyroxine replacement was started to patients with hypothyroidism, and had been followed-up for 6 months. Mean basal serum total antioxidant status (TAS), total thiol, arylesterase, and paraoxonase 1 (PON1) levels were significantly lower, and serum total oxidant status (TOS) and oxidative stress index (OSI) were significantly higher in the patients with hypothyroid than the controls. In the hypothyroid group serum TAS, total thiol, arylesterase, and PON1 levels increased and serum TOS and OSI levels decreased significantly after levothyroxine treatment. Pretreatment serum TAS, total thiol, PON1, and arylesterase levels were positively correlated with free levothyroxine (fT4) and negatively correlated with thyroid-stimulating hormone (TSH), antithyroid peroxidase (anti-TPO), and antithyroglobulin (anti-TG) levels. Also, pretreatment serum TOS and OSI levels were negatively correlated with fT4 levels and positively correlated with TSH, anti-TPO, and anti-TG. We have also found that the fT4 and anti-TPO levels are independent predictors of the oxidative stress parameters in stepwise multivariable linear regression analysis. This study suggests that levothyroxine replacement decreases oxidant status and increases antioxidant status following the 6 months of levothyroxine replacement in hypothyroidism that develops in accordance with the HT.

Ameliorated effects of Lactobacillus delbrueckii subsp. lactis DSM 20076 and Pediococcus acidilactici NNRL B-5627 on Fumonisin B1-induced Hepatotoxicity and Nephrotoxicity in rats

Oxidative stress has been implicated in a number of human regeneration and disease processes including atherosclerosis, pulmonary fibrosis, cancer, and different neurodegenerative diseases. The aim of this study was to evaluate the protective effects of Lactobacillus delbrueckii subsp. lactis DSM 20076 (LL-DSM) and Pediococcus acidilactici NNRL B-5627 (PA-NNRL) against the hepatic- and nephro-toxicity of fumonisin B1 (FB1) in FB1-treated rats for an experimental period of 4-weeks. Eighty mature male Sprague-Dawley rats were divided to 12 groups: 1 untreated group; 3 groups fed by a FB1-contaminated diet (50, 100 and 200 mg FB1/kg diet, respectively); 1 group fed orally by LL-DSM (1 ml/d); 1 group fed orally by PA-NNRL (1 ml/d); 3 groups co-administered by FB1-contaminated diet and LL-DSM (1 ml/d), and 3 groups co-administered by FB1-contaminated diet and PA-NNRL (1 ml/d). Malonaldehyde (MDA) nitric oxide, glutathione content, SOD activity, total antioxidant capacity (TAC), total oxidant status (TOS) and oxidative stress index (OSI) were determined. DPA assay was used to assess apoptosis in liver and kidney tissues. The animals fed with FB1-contaminated diet showed a significant increase in oxidative stress markers and DNA fragmentation accompanied with significant decrease in GSH content, SOD activity, and TAC in liver and kidney tissues, especially at high-dosage of FB1 (T200). Probiotics antioxidant strains (LL-DSM and PA-NNRL) relatively succeeded to restore almost all parameters investigated as well as to reduce DNA fragmentation in liver and kidney tissues. As a conclusion, probiotics may induce its protective role via increasing the antioxidant capacity, inhibition of lipid peroxidation, scavenging of free radicals and decreasing DNA lesions in liver and kidney of experimental animals tested.

Serum levels of neopterin, inflammatory markers and oxidative stress indicators in hyperemesis gravidarum.

To investigate whether serum levels of neopterin and inflammatory markers including C-reactive protein (CRP), tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and oxidative status indicators were altered in patients with hyperemesis gravidarum (HG) compared to asymptomatic pregnant women. This cross-sectional study was performed including 30 pregnant women with HG (mean age: 30.67 ± 6.68) and 30 asymptomatic pregnant women (mean age: 28.00 ± 5.30). Demographic features, obstetric history, and the Pregnancy Unique Quantification of Emesis/Nausea (PUQE) index were noted. Complete blood count, serum biochemical assay and measurement of CRP, TNF-α, IL-6, total antioxidant status and total oxidative status (TOS) levels were taken and compared between groups. White blood cell count (P = 0.013), platelet count (P = 0.015), TOS (P < 0.001), and PUQE score (P < 0.001) were remarkably higher in HG pregnancies. On the other hand, serum levels of lactate dehydrogenase, (P < 0.001), sodium (P < 0.001), potassium (P < 0.001), chloride (P < 0.001) and TAS (P < 0.001) were higher in the control group. There was no difference in the levels of neopterin, CRP, TNF-α and IL-6. In patients with HG, a positive correlation was detected between TOS and serum levels of lactate dehydrogenase, while TNF-α, IL-6 and neopterin were positively correlated with hemoglobin levels. Our results demonstrated no association between inflammation and HG. Elucidation of the pathophysiology and complex interaction between various inflammatory processes in HG necessitates further trials on larger series.

Oxidative status and lymphocyte DNA damage in patients with acute pancreatitis and its relationship with severity of acute pancreatitis.

Acute pancreatitis (AP) is a life-threatening disease with a rising incidence. The aim of this study was to investigate the association between oxidative status, lymphocyte deoxyribonucleic acid (DNA) damage, and acute pancreatitis. A total of 45 patients with AP and 35 healthy controls were included in the study. We assessed pancreatic enzymes, oxidative stress, and lymphocyte DNA damage. The severity of AP disease was determined by the Harmless Acute Pancreatitis Score (HAPS) and Balthazar scoring systems. In AP patients, lymphocyte DNA damage was significantly higher than in controls [49.84±25.48 arbitrary units (AU) vs. 28.80±13.98 AU, p<0.001]. The plasma total oxidative status (TOS) and oxidative stress index (OSI) were higher in patients than in healthy controls (10.36±5.54 vs. 8.47±2.66, p<0.05; 0.64±0.35 vs. 0.45±0.13 AU, p<0.001, respectively). The plasma total antioxidant status level in patients was lower than in healthy controls (1.66±0.19 vs. 1.86±0.18, p<0.001). Lymphocyte DNA damage was correlated with TOS, OSI, and HAPS and Balthazar scores. This study shows that patients with AP have higher lymphocyte DNA damage and more deteriorated oxidative status than healthy controls.

Intraperitoneal Administration of Silymarin Protects End Organs from Multivisceral Ischemia/Reperfusion Injury in a Rat Model.

ObjectiveTo determine whether intraperitoneal silymarin administration has favorable effects on the heart, lungs, kidney, and liver and on oxidative stress in a rat model of supraceliac aorta ischemia/reperfusion injury.MethodsThirty male Wistar albino rats were divided equally into three groups: sham, control, and silymarin. The control and silymarin groups underwent supraceliac aortic occlusion for 45 min, followed by a 60 min period of reperfusion under terminal anesthesia. In the silymarin group, silymarin was administered intraperitoneally during ischemia at a dose of 200 mg/kg. Rats were euthanized using terminal anesthesia, and blood was collected from the inferior vena cava for total antioxidant capacity, total oxidative status, and oxidative stress index measurement. Lungs, heart, liver and kidney tissues were histologically examined.ResultsIschemia/reperfusion injury significantly increased histopathological damage as well as the total oxidative status and oxidative stress index levels in the blood samples. The silymarin group incurred significantly lesser damage to the lungs, liver and kidneys than the control group, while no differences were observed in the myocardium. Furthermore, the silymarin group had significantly lower total oxidative status and oxidative stress index levels than the control group.ConclusionIntraperitoneal administration of silymarin reduces oxidative stress and protects the liver, kidney, and lungs from acute supraceliac abdominal aorta ischemia/reperfusion injury in the rat model.

Role of nitro-oxidative stress in the pathogenesis of experimental rat periodontitis.

Background and aimsPeriodontitis is a common chronic adult condition that implicates oxidative damage to gingival tissue, periodontal ligament and alveolar bone. This study aimed at assessing the association between the nitro-oxidative stress and the periodontal tissues destructions in experimental rat periodontitis.MethodsPeriodontitis was induced in 15 male albino rats by repetitive lesions to the gingiva adjacent to the inferior incisors, performed daily, for 16 days. On D1, D3, D6, D8, and D16 the onset and evolution of periodontitis were monitored by clinical and histopathological examinations; blood was collected and serum nitro-oxidative stress was evaluated through total nitrites and nitrates, total oxidative status, total antioxidant capacity, and oxidative stress index.ResultsThe results demonstrated that there was a graded and continuous increase in serum levels of total nitrites and nitrates, total oxidative status and oxidative stress index, which was consistent with the severity of periodontal destructions during periodontitis progression. However, total antioxidant capacity was not significantly influenced by the disease progression.ConclusionsIn experimental rat periodontitis, the systemic nitro-oxidative stress was associated with the severity of periodontal destructions assessed clinically and histopathologically. Therefore, systemic nitro-oxidative stress parameters might be used as diagnostic tools in periodontitis.

Total antioxidant status and oxidative stress in recurrent aphthous stomatitis.

Recurrent aphthous stomatitis is an idiopathic, chronic, recurrent inflammatory disease of the oral mucosa. It is thought that oxidative stress caused by systemic inflammation plays a basic role in the etiopathogenesis of recurrent aphthous stomatitis. The aim of this study is to review oxidative status and DNA damage in recurrent aphthous stomatitis. The study included 42 patients with an active recurrent aphthous stomatitis lesion and 39 healthy volunteers with similar demographic characteristics. DNA damage was analyzed using alkaline single cell gel electrophoresis (comet assay). Plasma levels of total antioxidant status and total oxidative status were determined by using an automated measurement method. Oxidative stress index was calculated as total oxidative status/total antioxidant status and × 100. The total oxidative status and oxidative stress index values were significantly higher in the recurrent aphthous stomatitis group compared to the control group, while total antioxidant status values were significantly lower. In the recurrent aphthous stomatitis group, DNA damage was observed to be significantly higher than the control group. In correlation analysis, significant correlation was found between DNA damage and the oxidative stress index and total oxidative status values in the recurrent aphthous stomatitis group. This is the first report in the literature that demonstrates association of recurrent aphthous stomatitis with increased oxidative status.

Impact of morbid obesity and bariatric surgery on antioxidant/oxidant balance of the unstimulated and stimulated human saliva.

There is no study evaluating the influence of morbid obesity and bariatric surgery on antioxidant/oxidant homeostasis of the unstimulated and stimulated human saliva. Salivary flow rate, total antioxidant status (TAS), total oxidant status (TOS), oxidative status index (OSI), the total amount of uric acid (UA), polyphenols (pPh), catalase (CAT), superoxide dismutase 2 (SOD2), specific activity of peroxidase (Px), as well as malondialdehyde (MDA), and advanced glycation end products (AGE) concentrations were determined in the unstimulated (UWS) and stimulated (SWS) whole saliva of patients with morbid obesity before and after bariatric surgery. In both UWS and SWS, the total amount of TOS, OSI, SOD2, and MDA was statistically higher in patients with morbid obesity as compared to the healthy controls, as well as significantly lower in the patients treated surgically as compared to the obese patients. The median values of the total amount of TAS, CAT, UA, pPh, and specific activity of Px were significantly reduced in UWS and SWS in patients with morbid obesity as compared to the control group and also statistically elevated in patients after bariatric surgery as compared to the patients with morbid obesity. In morbid obesity, reduced unstimulated and stimulated salivary flow can be observed. Bariatric surgery restored only unstimulated salivary flow to normal values. Disturbances in oxidant/antioxidant homeostasis may be observed in UWS and SWS of obese patients before and after treatment.

ISCHEMIA-REPERFUSION SYNDROME AND RESULTS OF OPEN AND ENDOVASCULAR REPAIR OF INFRARENAL ABDOMINAL AORTIC ANEURYSM

In the period from March 2013 to May 2014, in order to study the syndrome of ischemia-reperfusion and immediate treatment results, a prospective non-randomized clinical study of 43 patients with infrarenal abdominal aortic aneurysm (AAA) was realized. The patients, depending on the method of treatment, divided into 2 groups: 26 patients with open repair (OR) and 17 patients with endovascular repair (EVAR). The main criteria for inclusion into the study were AAA of II and III type by A. V. Pokrovsky and elective repair of the AAA. As markers of ischemia-reperfusion C-reactive protein, proinflammatory cytokine IL-6, anti-inflammatory cytokine IL-10 and oxidative status were investigated. The level of ischemic inflammation and reperfusion markers in patients with OR was generally higher than in patients with EVAR, and the level of IL-6 excess was statistically significant (p = 0.001). The longer the time compression of the abdominal aorta in the OR the higher the level of markers of ischemia-reperfusion. In patients with a time compression of the abdominal aorta more than 30 minutes there was a significant excess of IL-6 before removing the clamp from the abdominal aorta (p = 0.035) and after the start of the magistral blood flow to both lower extremities (p = 0.050), as well as significant excess of indicator of oxidative status of the blood Oxystat before removing the clamp from the abdominal aorta, after the launch of the main blood flow to the feet and 30 minutes after the end of surgery (p = 0.001). The number of local and systemic complications at the early postoperative period was significantly higher in patients undergoing OR (p = 0.002), which for this indicator shows the benefits of EVAR.

Evaluation of oxidative metabolism and oxidative DNA damage in patients with obsessive–compulsive disorder

There are limited published data about the role of oxidative stress in the pathophysiology of obsessive-compulsive disorder (OCD). In addition, oxidative stress and oxidative DNA damage have not been investigated together in OCD. In this study, we aimed to evaluate oxidative stress and oxidative DNA damage in patients with OCD. Forty-two patients with OCD who were diagnosed in the Psychiatry Clinic of Gaziantep University and 38 healthy volunteers were enrolled in the study. Serum 8-hydroxideoxiguanosine (8-OHdG), total antioxidant status, total oxidant status evaluation and oxidative stress index calculation were conducted in Gaziantep University Biochemical Laboratory. There were no significant differences in the total antioxidant status, total oxidant status and oxidative stress index levels between the patients and control group. However, 8-OHdG levels were significantly higher in OCD patients than controls (P = 0.022). In addition, 8-OHdG levels were significantly lower in patients who took treatment than in patients who were newly diagnosed (P = 0.016). In our study, we found that oxidative DNA damage increased in OCD patients even though oxidative stress was normal. In addition, DNA damage was lower in patients who were treated compared to those without treatment.

Total antioxidant and oxidant status of plasma and renal tissue of cisplatin-induced nephrotoxic rats: protection by floral extracts of Calendula officinalis Linn.

AbsractThe present study was aimed to determine the total antioxidant status (TAS), total oxidant status (TOS) and oxidative stress index (OSI) of plasma and renal tissue in cisplatin (cDDP) induced nephrotoxic rats and its protection by treatments with floral extracts of Calendula officinalis Linn. Treatment with cDDP elevated (p < 0.05) the levels of blood urea nitrogen, creatinine (CR), TOS, OSI and malondialdehyde (MDA) but lowered (p < 0.05) total plasma proteins, TAS, total thiols (TTH), blood glutathione (GSH) and antioxidant enzymes compared to the control group. Pre- and post-treatments of ethanolic floral extract of C. officinalis along with cDDP restored (p > 0.05) CR, albumin, TOS, GSH and activities of antioxidant enzymes in blood and renal tissue. Ethanolic extract treatments reduced (p < 0.05) MDA level in renal tissue without restoring the erythrocyte MDA level following cDDP treatment. These observations were further supported by the histopathological findings in renal tissue. Observations of the present study have shown that treatments with ethanolic floral extract of C. officinalis protect cDDP induced nephrotoxicity by restoring antioxidant system of the renal tissue.

Involvement of Glycogen Synthase Kinase-3β and Oxidation Status in the Loss of Cardioprotection by Postconditioning in Chronic Diabetic Male Rats.

Diabetes mellitus as a main risk-factor of ischemic heart disease may interfere with postconditioning'scardioprotective effects. This study aimed to investigate the involvement of glycogen synthase kinase-3β (GSK-3β) and oxidation status in chronic diabetes-induced loss of cardioprotective effect of ischemic-postconditioning (IPostC) in Wistar rats. After 8 weeks of induction of diabetes by streptozotocin (50mg/kg), hearts of control and diabetic rats were isolated and mounted on a constant-pressure Langendorff system. All hearts were subjected to 30min regional ischemia followed by 60min reperfusion (by occluding and re-opening of left anterior descending coronary artery, respectively). IPostC was applied immediately at the onset of reperfusion. At the end of reperfusion, the infarct size of myocardium was measured via computerized planimetry. Myocardial contents of malondealdehyde and glutathione as indices of oxidative status were assayed spectrophotometrically and the total and phosphorylated forms of myocardial GSK-3β were quantified through western blotting. IPostC reduced the infarct size of control hearts from 41±2.9% to 28±1.9% (P<0.05), whereas it could not induce significant changes in infarct size of diabetic animals (35±1.8% vs. 39±3.1%). IPostC-induced reduction in malondealdehyde and elevation in glutathione contents were significant only in control not in diabetic hearts. The total forms of GSK-3β were similar in all groups; however, the phosphorylation of GSK-3β (at Ser9) by IPostC was greater in control hearts than diabetics (P<0.01). The failure of cardioprotection by IPostC in diabetic hearts may be attributed to the loss of phosphorylation of GSK-3β and thereby increase in oxidative stress in diabetic states.