Malondialdehyde Levels In Group Research Articles

Surgery-Induced Changes in Erythrocyte and Plasma Lipid Peroxidation, Enzymatic and Non-Enzymatic Antioxidants of Female Rats: Protective Role of Heparin and Pentoxifylline

Background: Intra abdominal adhesions are a complication that occurs after many abdominal surgical procedures, especially gynecological operations. These complications occur by irritating the peritoneum due to such circumstances as infection or surgical trauma, and are considered a pathological part of the healing process of peritoneal injury. It manifests itself with symptoms such as pain, intestinal or urethral obstruction and abdominal abscesses. Oxidative stress due to adhesions plays an important role on adhesion formation. In addition to many researches done at the point of prevention of adhesion and decreasing stress parameters, in this study, it was planned to determine the effect of Heparin (H) and Pentoxifylline (PTX) on malondialdehyde (MDA) and some antioxidant values.Materials, Methods & Results: This study was performed on rats and thirty-seven female Sprague-Dawley rats were randomized into four groups. The first group was sham (Sh) group (n = 7) and laparotomy was performed and 2 mL of 0.9 % NaCl was applied. For all other rats (n = 30) the small intestine was withdrawn and the uterus was uncovered and the anti mesenteric surfaces of the left uterine horn and left abdominal wall were superficially tilted until slight bleeding was seen. Lesion areas have been covered. Two mL 0.9 % NaCl to control (C) group (n = 10), 500 IU heparin to group H, and 25 mg / kg Pentoxifylline to group PTX (n = 10) have been given and then the abdominal incision was closed. The adhesion score of group Sh was found to be more important than C and PTX groups (P < 0.05). The adhesion score of group C was determined to be more significant than group H (P < 0.05). In group Sh, erythrocyte reduced glutathione (GSH) levels were found to be more significant (P < 0.01) than C, H and PTX groups whereas it was found that group C was more significant than group H (P < 0.01). In group Sh, glutathione peroxidase (GSH-Px) activity was found to be more significant (P < 0.05) than H and PTX groups, while MDA level was found to be lower and more significant (P < 0.01) than group C. In addition, group C was found to be higher and more significant (P < 0.01) than group H. Plasma vitamin E levels in Sh, H and PTX groups were found to be higher and more significant (P < 0.01) than group C. It is also observed that MDA levels in group C are higher and more significant (P < 0.01) than all groups. Nitric oxide (NO) level in Sh group was found to be lower and more significant (P < 0.05) than the other groups whereas it is determined that NO level in H group is higher and more significant (P < 0.05) than group C. Activites of erythrocyte catalase (CAT) and superoxide dismutase (SOD), the levels of plasma vitamin A and β-carotene were not important in all groups.Discussion: Intra abdominal adhesions that occur due to operations performed in the abdominal region still remain as a major problem. This adhesion brings certain problems with itself. Various applications have been made to reduce these problems. In this study, it was observed that inhibition of heparin and pentoxifylline adhesions contributed to the reduction of MDA levels and the reduction of oxidative damage due to the increase in levels of Vitamin E, GSH, GSH-Px and NO levels. In conclusion, it is suggested that heparin and pentoxifylline should be used to prevent adhesions due to abdominal operations and to reduce oxidative damage.

Effects of Yoga on Blood Pressure and MDA in Mild Hypertensive Patients

Background: Cardiovascular diseases (CVD) have emerges as the leading cause of mortality throughout the world. Essential hypertension is one of the important risk factor for CVD in modern society despite advanced and effective management. Malondialdehyde (MDA) is a well known marker of oxidative stress, which is produced by oxidation of poly unsaturated fatty acid. Nadishodhanpranayam leads to decrease stress as well as blood pressure.Subjects and Methods:It was an interventional type of study. Ninety seven mild hypertensive patients (53 males and 44 females) of group I completed the yoga program. While, fifty normotensive subjects were include as control in group II. Blood pressure and MDA was measured of every participants before and after three months of yoga program.Results:Total ninety seven mild hypertensive patients of age 33.6± 8.66 years of group I completed three months yoga program. However, fifty subjects (34.7± 7.73 years)of group II had not done any yogic exercise during three months. Results of the present study showed that there was a significant difference in SBP (p<0.001), DBP (p<0.001), HR (p<0.001), PP (p<0.001) and MAP (p<0.001) group I mild hypertensive patients after following three months yoga program. There was a significant difference between before and after yoga program MDA level of group I mild hypertensive patients. However, there was an insignificant difference between before and after three months level of MDA in group II control subjects.Conclusion: In this study, it has been observed that daily practice of yoga improves the blood pressure of mild hypertensive patients. Moreover, it substantially decreases the oxidative stress. Yoga can be an effective alternative to reduce the blood pressure in mild hypertensive patients either with medication or without medication.

Effects of Solo Garlic Extract in Decreasing Malondialdehyde (MDA) Levels due to E-Cigarette Exposure

The popularity of E-Cigarette has increased significantly over the last decade, and has potential to replace tobacco cigarettes. Aerosol which is produced by E-Cigarette, contains reactive carbonyl and free radicals, inducing oxidative stress and causing inflammation, proliferation, and cell damage. This oxidative stress can be seen through the Malondialdehyde (MDA) levels in the body, and reduced by antioxidant activity in Solo Garlic extract. The aim of this study is analyzing the differences of MDA levels in four treatment groups. 28 white rats were divided into four groups and three of them were exposured by E-Cigarette. This study showed that the highest MDA levels was found in the group which was exposured by E-Cigarette without solo garlic extract (7,179 nmol/ml). MDA levels can be reduced by antioxidant activity shown in the group which was exposured by E-Cigarette and solo garlic extract dose 0,05 gram/day (the smallest dose), amount 3,715 nmol/ml. The average of MDA levels in group which was given by the smallest dose of solo garlic extract, is lower than the control group. So, it can be concluded that using solo garlic extract less than 0,05 gram/day can restore MDA levels to a normal state (4,210 nmol/ml).

Lipid peroxidation marker in saliva of Type 2 Diabetes Mellitus with oral manifestations – A Clinical and biochemical study.

Background: Type 2 Diabetes progresses gradually and in a stepwise order. It commences with insulin resistance and progresses slowly with time until the body fails to maintain glucose homeostasis. These alterations are accompanied with changes in lipid peroxidation. The determination of the oxidative stress requires sometimes invasive techniques. Exploring saliva for oxidative stress has great clinical interestObjective: The present study was undertaken to estimate, compare and correlate the levels of malondialdehyde (MDA) in the serum and saliva of patients with type 2 diabetes mellitus with oral manifestations and healthy controls.Materials and Methods: Serum and salivary Malondialdehyde levels were estimated in 45 healthy subjects (Group I) and 45 patients with Type 2 Diabetes with oral manifestations (Group II). Estimation of Random blood sugar levels were done by GOD-PAP methodology. The data obtained from the present study was analyzed using SPSS software. Independent T test was used to compare the levels in the study and control group. Pearson’s correlation coefficient was used to correlate the changes in serum and saliva. P&lt; 0.05 was considered significant.Results:The mean serum Malondialdehyde levels in Group I was 0.958 μM/l, while the mean serum Malondialdehyde levels of Group II was 2.828 μM/l. The mean salivary Malondialdehyde levels in Group I was 0.217 μM/l, while the mean salivary Malondialdehyde levels of Group II was 0.688μM/l. The mean serum and salivary Malondialdehyde levels were significantly increased in subjects with Type 2 Diabetes with oral manifestations in comparison to the healthy subjects. Fair positive correlation was observed between serum and salivary Malondialdehyde levels in Group I (r = 0.341) and very good positive correlation was observed between serum and salivary Malondialdehyde levels in Group II (r = 0.613).Conclusion: Serum and salivary Malondialdehyde was significantly higher in subjects with Type 2 Diabetes Mellitus with oral manifestations when compared to healthy controls. The increase in serum and salivary levels of MDA, shows that free radicals are formed disproportionately in diabetes mellitus by glucose degradation, non-enzymatic glycation of proteins, and the subsequent oxidative degradation, which may play an important role in the development of complications in diabetic patients. Fair positive correlation was found between serum and salivary Malondialdehyde in healthy subjects and very good positive correlation was observed between serum and salivary Malondialdehyde in subjects with Type 2 Diabetes Mellitus with oral manifestations. This study highlights that type 2 diabetic patients undergo abnormally high levels of oxidative stress. Hence exploring saliva for oxidative stress is of great importance. Thus saliva could be used as a reliable, non-invasive tool in the assessment of oxidative status.Bangladesh Journal of Medical Science Vol.17(4) 2018 p.644-651

Effects of molsidomine on retinal ischemia/reperfusion injury in rabbits

We investigated the effect of molsidomine (MOL) on ischemia/reperfusion (I/R) injury. Rabbits were assigned to four groups: group 1, sham; group 2, I/R; group 3, MOL treatment for 4 days after I/R; group 4, MOL treatment for 1 day before I/R and 3 days after I/R. Retinal I/R was produced by elevating the intraocular pressure to 150 mm Hg for 60 min. Seven days after I/R, the eyes were enucleated. Retinal changes were examined using histochemistry. The levels of malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase (CAT) also were measured. We found a significant increase in the thickness of the outer nuclear layer of group 3 compared to the other groups. In groups 3 and 4, caspase-3 stained cells in the ganglion cell layer were decreased compared to group 2. We found a significant increase in caspase-3 stained cells in the inner nuclear layer (INL) of group 2 compared to the other groups. We found a significant increase in caspase-3 stained cells in group 3 compared to group 4 in the INL. The MDA level in group 2 was significantly higher than group 1 and MOL significantly decreased MDA levels in groups 3 and 4. We found that MOL protected the retina from I/R injury by enhancing antioxidative effects and inhibiting apoptosis of retinal cells.

What is the protective effect of metformin on rat ovary against ischemia-reperfusion injury?

The aim of this study was to investigate the protective effect of metformin on the rat ovary against ischemia-reperfusion injury. Thirty-seven female Wistar albino rats were used in the study. The rats were divided into five groups, as follows: sham operation group (group 1); torsion group (group 2); torsion/detorsion + saline group (group 3); torsion/detorsion + low-dose metformin group (group 4); and torsion/detorsion + high-dose metformin group (group 5). The right ovary from each rat was evaluated histologically using hematoxylin-eosin staining, and the left ovaries were evaluated for tissue levels of the reduced-glutathione-to-oxidized-glutathione ratio, malondialdehyde (MDA), and caspase-3 activation. The highest damage score was observed in group 3, and the lowest score was observed in group 1. The tissue caspase-3 activity levels of groups 2, 3, and 4 were significantly higher than those of group 1. The difference between group 1 and group 5 in terms of tissue caspase-3 activity was not significant (P = 0.4). The reduced-glutathione-to-oxidized-glutathione ratio of group 1 was significantly higher than the ratios found in groups 2, 3, and 4. The tissue MDA level of group 1 was significantly lower than the levels found in groups 2, 3, 4, and 5. The tissue MDA level of group 5 was significantly lower than the levels in groups 3 and 4. From both histopathological and biochemical analyses, the results of the study demonstrated that metformin has beneficial effects when it comes to attenuating ovarian ischemia-reperfusion injury.

Antioxidant Effect of Purple Eggplant Flour (Solanum melongena L.) Against Oxidative Stress in Hyperglycaemic Rats

Abstract Background and Aims: Oxidative stress in diabetes mellitus (DM) occurs due to an increase in free radicals and decreased antioxidant defenses including superoxide dismutase (SOD). It causes the occurrence of lipid peroxidation as indicated by the levels of malondialdehyde (MDA). Healthy foods that are rich in antioxidants are needed to reduce oxidative stress, such as eggplant (Solanum melongena L.). Until now there is no scientific evidence about the effects of purple eggplant against oxidative stress in hyperglycemia. The aim of this study is to determine the antioxidant effect of eggplant flour (TTU) against oxidative stress in hyperglycemic rats by induced Nicotinamide-Streptozotocin (NA-STZ). Materials and Method: This experimental study was designed using posttest only. Thirty-six male Sprague Dawley rats, aged 10-12 weeks, body weight (bw) 207.25±26.76 grams were divided randomly into 5 groups, namely 2 control groups (normal and hyperglycemic) and 3 groups of treatment. Hyperglycemic rats were induced by NA-STZ (230-65 mg/kg bw). Administration of TTU through feed for 28 days varied with dose of 2.36 grams, 4.71 grams, and 7.07 grams in groups P1, 2, and 3, respectively. Examinations of blood glucose levels were conducted before intervention, whereas the antioxidant activity of SOD and MDA plasma levels were examined after intervention. Results: The antioxidant activity of SOD in groups which were given TTU was higher than the hyperglycemic rats (31.19±1.98%), but lower than the normal group (220.83±23.68%) Levels of plasma MDA in groups which were given TTU were lower than the hyperglycemic rats (220.47±5.24 nmol/L), but higher than the normal group (1.55±0.20 nmol/L). The antioxidant activity of SOD in the P3 group (69.29±3.82%) was higher than the P1 group (41.84±3.82%) and the P2 group (55.10±3.23%), while the levels of plasma MDA in the P3 group (1.89±0.17 nmol/L) was lower than the P1 group (3.79±0.24 nmol/L) and the P2 group (3.17±0.53 nmol/L). Conclusion: The results of this study demonstrate that administration of TTU significantly prevents oxidative stress in hyperglycemic rats.

Levels of leukocyte oxidative DNA damage (8-OHdG), serum coenzyme Q10 and lipid peroxidation in the formation attacks of patients with multiple sclerosis

Multiple sclerosis (MS) is a demyelinating disease&#x0D; of the nervous system. Evidence about oxidative stress plays an important role&#x0D; in the pathogenesis of MS is increasing day by day. In our study, we aimed to&#x0D; investigate the effect of oxidative DNA damage and oxidative stress in the&#x0D; pathogenesis of MS disease. Blood samples were obtained from during an attack&#x0D; (Group 1), between attacks (Group 2) of MS patients (20 male and 10 female) and&#x0D; 30 healthy volunteers (Group 3). Malondialdehyde (MDA) levels as indicator of&#x0D; oxidized lipids were detected using fluorescence dedector with high pressure&#x0D; liquid chromatograph (HPLC). DNA was extracted from leukocytes of control and&#x0D; patients with MS and then we measured 8-hydroxy- 2' -deoxyguanosine (8-OHdG) and deoxyguanosin (dG) by using HPLC method with electrochemical and&#x0D; UV detector, respectively. Measurement of oxidized coenzyme Q10 (CoQ10) and&#x0D; reduced CoQ (CoQ10H) was performed by using UV detector with HPLC method. Serum&#x0D; MDA level of group 1 was significantly higher than those in group 2 and group 3&#x0D; (p&amp;lt; 0.001). 8- OHdG/106 dG ratio&#x0D; of group 1 was significantly higher than those in group 2 and group 3 (p&amp;lt;&#x0D; 0.001). CoQ10/CoQ10H rates of group 1 were significantly increased compared&#x0D; with group 2 and group 3 (p&amp;lt;0.001). In conclusion, we observed that&#x0D; oxidative DNA damage, lipid and mitochondria oxidative damage were high in&#x0D; blood of patients with MS. It seems that oxidative stress acts a play role the&#x0D; pathogenesis of MS patients as well as induces attacks.&#x0D; &#x0D;

Low-energy shock wave preconditioning reduces renal ischemic reperfusion injury caused by renal artery occlusion.

To evaluate whether low energy shock wave preconditioning could reduce renal ischemic reperfusion injury caused by renal artery occlusion. The right kidneys of 64 male Sprague Dawley rats were removed to establish an isolated kidney model. The rats were then divided into four treatment groups: Group 1 was the sham treatment group; Group 2, received only low-energy (12 kv, 1 Hz, 200 times) shock wave preconditioning; Group 3 received the same low-energy shock wave preconditioning as Group 2, and then the left renal artery was occluded for 45 minutes; and Group 4 had the left renal artery occluded for 45 minutes. At 24 hours and one-week time points after reperfusion, serum inducible nitric oxide synthase (iNOS), neutrophil gelatinase-associated lipocalin (NGAL), kidney injury molecule-1 (KIM-1), creatinine (Cr), and cystatin C (Cys C) levels were measured, malondialdehyde (MDA) in kidney tissue was detected, and changes in nephric morphology were evaluated by light and electron microscopy. Twenty-four hours after reperfusion, serum iNOS, NGAL, Cr, Cys C, and MDA levels in Group 3 were significantly lower than those in Group 4; light and electron microscopy showed that the renal tissue injury in Group 3 was significantly lighter than that in Group 4. One week after reperfusion, serum NGAL, KIM-1, and Cys C levels in Group 3 were significantly lower than those in Group 4. Low-energy shock wave preconditioning can reduce renal ischemic reperfusion injury caused by renal artery occlusion in an isolated kidney rat model.

Moringa (Moringa oleifera) leaf powder to reduce the grade of liver injury of Wistar rat induced with mancozeb

Background: Liver is an organ that is the most frequently suffering injury due to poisoning chemical materials. Mancozeb (Mz) is one of the poisoning chemical materials that cause the liver injury (LI). Moringa leaf (Mo) contains antioxidant to muffle the free radical. The objective of this study is to know the effects of Mo leaf in reducing the level of LI of Wistar rat induced by Mz through antioxidant mechanism.Method: In this experimental study, 24 Wistar rats were randomly classified. Group I was terminated in the beginning of the study as the basis of necrosis index. Group II was treated as the control group. Group III was exposure with Mz started at day 11 until day 20. Group IV was given Mo started at the day 1 until day 10 and prior to giving Mz until day 20. In the beginning and the end of the study, the blood of all rats in Group II, III, and IV was aspirated in order to measure the contents of malondialdehyde (MDA), alanine aminotransferase (ALT), glutathione peroxidase (GPx), catalase (CAT), and superoxide dismutase (SOD). The necrosis index was measured in the end of the study. The data were analyzed in unpaired t-test and linear regression.Results: Group I and II did not experience LI. The increase of MDA level in Group IV (9.67 nmol/ml), which was lower (p=0.006) than Group III (45.05 nmol/ml). The decrease of level of GPx, CAT, and SOD in Group IV (0.07 nmol/ml; 0.48 nmol/ml; and 81.5 U/ml), which was lower (p=0.008; p=0.004; and p=0.0001) than Group III (0.23 nmol/ml; 0.86 nmol/ml; and 140.9 U/ml). The increase of necrosis index and ALT level in Group IV (4.42; 25.1 u/l) was lower (p=0.04; p=0.0001) than Group III (8.56 and 67.4 u/l). The result of multivariate test showed that the most beneficial towards the LI status was SOD. Conclusion: It is proven that Mo can reduce the level of LI in Wistar rats induced by Mz through the emphasis of decrease rate of endogen antioxidant of SOD.

Assessment of therapeutic effect of human choriogonadotropin in a chemical cystitis model

In this study, female rats induced with chemical cystitis were administered the hormone human choriogonadotropin (HCG), and it was aimed to reveal the usefulness of HCG in the treatment of interstitial cystitis/bladder pain syndrome. The materials for this study were 32 Wistar albino female rats. The study groups were formed as follows: the cystitis group (Group 1), the cystitis + HCG protection group (Group 2), the cystitis + HCG treatment group (Group 3), and the control group (Group 4), with eight rats in each group. In this study, blood and urine samples were taken from the rats, they were euthanized, and their bladders were removed for glutathione, malondialdehyde, tumor necrosis factor alpha, and interferon gamma measurements. It was observed that tissue damage in Group 2 was lower than that in the other two groups. Glutathione levels in Groups 2 and 4 were significantly higher than in Groups 1 and 3 (p = 0.01). Malondialdehyde levels of Groups 2 and 4 were significantly lower than the values in Groups 1 and 3 (p < 0.001). When the cystitis groups were compared in terms of their interferon gamma and tumor necrosis factor alpha levels, the lowest interferon gamma and tumor necrosis factor alpha levels were detected in Group 3. It was found that HCG has positive effects on experimental cystitis in rats. This study revealed that HCG should be researched as a therapeutic agent and formed a step for studies to be carried out on this subject.

The effect of dexpanthenol on experimentally induced ovarian ischaemia/reperfusion injury: a biochemical and histopathological evaluation.

The aim of this study was to evaluate the effect of two different doses of dexpanthenol (Dxp) onexperimentally induced ovarian ischaemia/reperfusion (I/R) injury ina rat model. Forty female rats were randomly divided into fivegroups: Group 1: sham operation; Group 2: 3-h ischaemia; Groups 3: 3-h ischaemia, 3-h reperfusion (I/R); Group 4: I/R + 300mg/kg Dxp intraperitoneally (i.p) Group 5: I /R + 500mg/kg Dxpi.p. Total anti-oxidant status (TAS), total oxidant status (TOS), oxidative stress index (OSI), tissue malondialdehyde (MDA) and activities of glutathione peroxidase and catalase were calculated. Ovarian tissue damage was assessed using a histopathological scoring system. The TOS and OSI values were significantly lower in Group 5, as compared to Groups 2 and 3 (p < 0.05). The MDA levels in Group 1 and Group 5 were significantly lower than those in Group 3 (p < 0.05). CAT and GSH-Px activity was higher in Group 5 than in Group 2 and Group 3 (p = 0.00). Tissue damage scores were elevated in all the groups compared with sham group, but the treatment with the different doses of Dxp before reperfusion ameliorated the tissue damage scores. The results showed that Dxp reduced ovarian I/R injury.

Comparative effect of treadmill and yoga on malondialdehyde level in normal young adults

Background: Stress level can be estimated by evaluating the malondialdehyde (MDA) levels produced from lipid peroxidation of polyunsaturated fatty acids. Accordingly, a holistic health care approach (instead of a conventional drug-based approach alone) for the treatment is highly recommended; development of a mind-body medicine or an inclusive approach of mind-body interactions is the need of the hour. Thus, the effect of yoga which comprises pranayama, asana, and meditation is more relaxing than the well-equipped gym schools of today which are very lucrative and attractive, but they are costly means of fitness. Yogic exercises are more relaxing and cost effective. Aims and Objectives: The purpose of this study is to compare and see the effect of treadmill exercise and yoga on oxidative stress. Materials and Methods: An observational study was conducted in Exercise Physiology Laboratory, Department of Physiology (Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences, Sawangi Meghe, Wardha, Maharashtra, India). 50 male subjects of age group 18-20 years, were divided into two groups, treadmill exercise (Group A) and yoga (Group B) consisting of 25 each. On regular exercise, subjects were assessed at the start of and after 3 months of the training schedule (45 min/5 days/week). Blood samples were collected to assess the MDA levels before and after the intervention. The parameter assessed were vital parameters (heart rate and pulse rate), VO2 max; they were also assessed for their social and environmental behavior by WHO-quality of life questionnaire. Results were compared using Student paired t-test and unpaired t-test and age-wise distribution by Chi-square test. Result: Results showed that the pre-exercise levels of MDA in Group A (1.30 ± 0.1) and Group B (1.23 ± 0.1) and the postexercise levels in Group A (0.92 ± 0.2) and Group B (0.37 ± 0.2). There was an increase in the vital parameter in Group A, whereas no significant changes were observed in Group B. VO2max levels state that the oxygen requirement is more for Group A than Group B. Conclusion: The study concludes that yoga has more beneficial effect than the treadmill exercise which helps to decrease the free radical production.

The role of oxidative stress in α-amanitin-induced hepatotoxicityin an experimental mouse model

This study aimed to evaluate oxidative stress markers of liver tissue in a mouse α-amanitin poisoning model with three different toxin levels. The mice were randomly divided into Group 1 (control), Group 2 (0.2 mg/kg), Group 3 (0.6 mg/kg), and Group 4 (1.0 mg/kg). The toxin was injected intraperitoneally and 48 h of follow-up was performed before sacrifice. Median superoxide dismutase activities of liver tissue in Groups 3 and 4 were significantly higher than in Group 1 (for both, P = 0.001). The catalase activity in Group 2 was significantly higher, but in Groups 3 and 4 it was significantly lower than in Group 1 (for all, P = 0.001). The glutathione peroxidase activities in Groups 2, 3, and 4 were significantly higher than in Group 1 (P = 0.006, P = 0.001, and P = 0.001, respectively). The malondialdehyde levels of Groups 3 and 4 were significantly higher than Group 1 (P = 0.015 and P = 0.003, respectively). The catalase activity had significant correlations with total antioxidant status and total oxidant status levels (r = 0.935 and r = -0.789, respectively; for both, P < 0.001). Our findings support a significant role for increased oxidative stress in α-amanitin-induced hepatotoxicity.

Comparisons of the effects of the sevoflurane and propofol on acute ischemia reperfusion and DNA damages in rabbits

The aim of this study was to compare the effects of sevoflurane and propofol anesthesia on oxidative DNA damage that occurs in low-extremity ischemia and is caused by tourniquet application. Fourteen New Zealand rabbits were randomly allocated into two equal groups. Group S (n=7) received sevoflurane (2.5-4 percent) inhalation and Group P (n=7) received a propofol infusion (1-2mg·kg-1·min-1), after which a pneumatic tourniquet was placed on the right lower extremity. Blood samples were collected prior to tourniquet placement (baseline), 120min after ischemia, 15min after ischemia and 120minutes (min) after ischemia. Malondialdehyde (MDA) levels were analyzed to determine lipid peroxidation, and single cell gel electrophoresis (SCGE) was used to determine DNA damage. At 15min after ischemia, the MDA levels in Group P (8.15±2.61μM) were higher than baseline (6.26±3.19μM, p=0.026) and Group S (4.98±0.77μM, p=0.01). DNA damage was similar in both groups, although DNA damage was higher than baseline (tail moment 0.63±0.27, tail intensity 3.76±1.26) in Group P at the 15th minute of reperfusion (tail moment 1.05±0.45, p=0.06; tail intensity 5.33±1.56, p=0.01). The increase in tail moment and tail intensity returned to normal levels in both groups 2hours after the termination of ischemia. Given that oxidative stress and genotoxic effect disappear in the late stages of reperfusion, we conclude that neither sevoflurane nor propofol can be considered superior to the other in anesthesia practices for extremity surgeries involving the use of a tourniquet.

Assessment of serum malondialdehyde, uric acid, and vitamins C and E levels in patients with recurrent aphthous stomatitis

Background/purposeRecurrent aphthous stomatitis (RAS) is a common oral mucosal disease. Recently, oxidative stress has been thought to play a major role in the etiopathogenesis of RAS. The aim of this investigation was to compare the serum levels of an important oxidant agent [malondialdehyde (MDA)] and nonenzymatic antioxidants [uric acid (UA) and vitamins C and E] in patients with RAS versus healthy individuals. Materials and methodsNinety-seven patients with idiopathic minor RAS and 97 race-, age-, and sex-matched healthy individuals were included in this study. All these individuals were allocated to three groups: RAS patients in the active stage (Group A); the same RAS patients in Group A in the remission stage (Group B); and healthy individuals without RAS (Group C). The serum levels of MDA, UA, and vitamins C and E were measured by the spectrophotometric method. Independent sample t test and paired t test were performed for statistical evaluation. ResultsSerum MDA level of Group A was significantly higher than that of Group B (P = 0.040) or Group C (P = 0.011), whereas the serum level of vitamin E was significantly decreased in Group A as compared with Group B (P = 0.012) or Group C (P = 0.001). No statistically significant differences were found between Group B and Group C in terms of MDA, UA, and vitamins C and E serum levels (P > 0.05). ConclusionWith the double-faced character of oxidant/antioxidant, UA and vitamin C may not play a crucial role in the pathogenesis of RAS. However, MDA and vitamin E can be used as indicators for RAS.

PENGARUH PEMBERIAN EKSTRAK ETANOL DAUN BAWANG MEKAH (Eleutherine Americana Merr.) TERHADAP KADAR MALONDIALDEHYDE TIKUS WISTAR (Rattus norvegicus) JANTAN PASCA PAPARAN ASAP ROKOK

Malondialdehyde (MDA) is a biomarker of lipid peroxidation that is closely correlated with level of oxidative stress. The aim of this study was to know ethanol extract activities from E. americana leaves against blood plasma MDA in male Wistar rats exposed by cigarette smoke using tiobarbituric acid test. The simplicia extracted by maseration using 70% ethanol. Twenty four rats were divided into six groups, i.e. : a normal group, an exposed cigarette smoke (negative) control group, a positive control group and three treatment groups. One normal group received carboxyl methyl cellulose and another groups exposed cigarette smoke during 14 days. Positive control group received vitamin E (18mg/kg BW), and another groups received ethanol extract of E. americana leaves doses 180; 90; 45mg/kg BW, respectively. The MDA level was analysed by spectrophotometer UV-Visible in 532,2 nm. The MDA level statically analysis by Kruskal-Wallis test and following by Mann-Whitney test. The mean MDA levels of normal group, negative control group, positive control group and groups received ethanol extract of E. americana leaves doses 180; 90; 45mg/kg BW were 0,11±0,09; 13,74±2,84; 0,06±0,03; 10,88±2,19; 0,13±0,03; 0,03±0,02 ppm. The mean MDA levels of groups received ethanol extract of E. americana leaves doses at 180; 90mg/kg BW significantly (p<0,05) lower than negative control group. These results show the beneficial effect of ethanol extract of E. americana leaves in the MDA level reducing on the rats that exposed by cigarette.

Study on anti-oxidase in smoking-related laryngeal squamous cell carcinoma

Objective:To investigate the role of oxidative stress in smoking-related laryngeal squamous carcinoma through detecting the expression of antioxidant enzymes in smoking patients. Method:A total of 138 cases with laryngeal squamous cell carcinoma enrolled in the first hospital affiliated the northern he bei college from 2012 to 2015 and forty five volunteers were conducted. All participants were divided into three groups according to smoking index: group A(heavy smoking, 88 cases of laryngeal cancer patients) and group B(no smoking 50 cases of laryngeal cancer patients) and C group(45 heavy smoking volunteers).Catalase(CAT), glutathione peroxidase(GSH-px) and malondialdehyde(MDA) and the expression of NRF2 in serum, tissue adjacent to carcinoma, and carcinoma tissues from each groups were measured, respectively. Result:①the expression of the CAT and GSH-px in group A were significantly lower than that of group B(P <0.05), but higher than that of group C(P <0.05); ②the MDA level of group A is significantly higher than group B(P <0.05) and C group(P <0.01);③NRF2 was highly expressed in carcinoma tissues, and the expression level was negatively correlated with degree of carcinoma differentiation (P <0.05). Conclusion:Compared with nonsmoking patients, heavy smoking patients with laryngeal cancer were under more severe oxidative stress. NRF2 expression level in patients with laryngeal squamous cell carcinomas was associated with pathological stage.

Comparisons of the effects of the sevoflurane and propofol on acute ischemia reperfusion and DNA damages in rabbits

Background and objectivesThe aim of this study was to compare the effects of sevoflurane and propofol anesthesia on oxidative DNA damage that occurs in low-extremity ischemia and is caused by tourniquet application. MethodsFourteen New Zealand rabbits were randomly allocated into two equal groups. Group S (n=7) received sevoflurane (2.5–4 percent) inhalation and Group P (n=7) received a propofol infusion (1–2mg·kg−1·min−1), after which a pneumatic tourniquet was placed on the right lower extremity. Blood samples were collected prior to tourniquet placement (baseline), 120min after ischemia, 15min after ischemia and 120minutes (min) after ischemia. Malondialdehyde (MDA) levels were analyzed to determine lipid peroxidation, and single cell gel electrophoresis (SCGE) was used to determine DNA damage. ResultsAt 15min after ischemia, the MDA levels in Group P (8.15±2.61μM) were higher than baseline (6.26±3.19μM, p=0.026) and Group S (4.98±0.77μM, p=0.01). DNA damage was similar in both groups, although DNA damage was higher than baseline (tail moment 0.63±0.27, tail intensity 3.76±1.26) in Group P at the 15th minute of reperfusion (tail moment 1.05±0.45, p=0.06; tail intensity 5.33±1.56, p=0.01). The increase in tail moment and tail intensity returned to normal levels in both groups 2hours after the termination of ischemia. ConclusionGiven that oxidative stress and genotoxic effect disappear in the late stages of reperfusion, we conclude that neither sevoflurane nor propofol can be considered superior to the other in anesthesia practices for extremity surgeries involving the use of a tourniquet.

Potential Antioxidant Activity of New Tetracyclic and Pentacyclic Nonlinear Phenothiazine Derivatives.

The global increase in oxidative stress related diseases such as cancer, cardiovascular, and inflammatory diseases caused by overwhelming level of free radicals in the body has encouraged the search for new antioxidant agents. Based on the ability of newly synthesized phenothiazine derivatives (6-chloro-11-azabenzo[a]phenothiazine-5-one and 6-[4-bromophenyl]-10-methyl-11-azabenzo[a]phenothiazine-5-one) to oxidize H2O2, a known free radical to sulfoxide, this study assessed the in vitro and in vivo antioxidant activity. The synthesized phenothiazine derivatives exhibited reducing power potential to convert Fe3+ to Fe2+ and high ability to scavenge H2O2 free radical in vitro. These activities were comparable to ascorbic acid, a standard antioxidant. The catalase activity significantly increased (p < 0.05) in groups 1 and 2 animals that received the phenothiazine derivatives compared to the controls (groups 3 and 4) suggesting the ability of the phenothiazine derivatives to scavenge H2O2 in vivo. The malondialdehyde level in groups 1 and 2 animals was lower than that in group 3 that received the reference compound (ascorbic acid) and group 4 that received the solvent suggesting the ability of the phenothiazine derivatives to prevent lipid membrane damage. AST and bilirubin levels were higher in group 2 animals which received 6-[4-bromophenyl]-10-methyl-11-azabenzo[a]phenothiazine-5-one compared to group 3, the positive control. The results suggest that phenothiazine derivatives, especially 6-chloro-11-azabenzo[a]phenothiazine-5-one, possess antioxidant activity though 6-[4-bromophenyl]-10-methyl-11-azabenzo[a]phenothiazine-5-one was slightly toxic. This activity may be due to the presence of electron donors such as sulfur as well as the richness of hydrogen in the additional benzene rings for substitution. Further study is needed to identify tolerable doses for possible therapeutic purposes.