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Showing 5 results for Oxidative Damage

Hamid Reza Akbari, Farimah Beheshti, Hamid Reza Sadeghnia, Yousef Baghcheghi, Mahmoud Hosseini,
Volume 0, Issue 0 (7-2019)

Introduction: Angiotensin converting enzyme (ACE) inhibitors are suggested to have some beneficial effects on the brain. In the present study the protective effects against brain tissues oxidative damage as possible mechanism for learning and memory improving effects of captopril was investigated in scopolamine treated rats.
Material and methods: Fifty male Wistar rats were divided into seven groups and treated: saline as a control group, Sco (scopolamine) and Sco-Capto10, 50 and 100 (captopril 10, 50 and 100 mg/ kg before scopolamine). Treatment was passive avoidance test and then the cortical tissues were collected to measure malondialdehyde (MDA), nitric oxide(NO) metabolites , thiol, super oxide dismutase (SOD) and catalase (CAT).
 Results: Scopolamine decreased the latency to enter the dark in passive avoidance test compared to control group (P<0.01- P<0.001). It also increased MDA and NO metabolites (P<0.001) while decreased thiol, SOD and CAT in comparison with control group (P<0.001). Captopril increased the latency to enter the dark (P<0.05- P<0.001). It also decreased MDA and NO metabolites (P<0.01 P<0.001) while, increased thiol, SOD and CAT (P<0.05- P<0.001).
 Conclusion: Captopril protected from the brain tissues oxidative damage to improve learning and memory impairment induced by scopolamine. 
Roya Amirinejad, Mohammad Ali Sahraian, Bahram Mohammad Soltani, Mehrdad Behmanesh,
Volume 21, Issue 2 (5-2017)

Introduction: Previous studies revealed that oxidative stress is elevated in multiple sclerosis (MS). It can harm to biological macromolecules such as DNA. However, the molecular mechanism in protection of genetic information from DNA damages is not clear in MS disease. In this study the expression level of some important genes of OGG1 and MYH involved in base excision repair pathway and, MTH1 and ITPA as main cleaning genes of nucleotide pool from rough nucleotides are examined in MS patients in compared to healthy group. Methods: Peripheral blood mononuclear cells were isolated from relapsing-remitting-MS patients and healthy subjects. After RNA extraction and cDNA synthesis, the expression levels of target genes were examined by RT-qPCR technique. Results: The level of the MTH1 and MYH genes expression were decreased, but the level of OGG1 mRNA was higher in patients in comparison to the control group. Obtained result did not shown any correlation between expression of examined genes and clinical features of patients such as MS severity and disease duration. Conclusion: These preliminary results provide more supportive evidences for involvement of oxidative damage and variation in expression of DNA repair genes in MS. Significant increase of OGG1 suggest that the development and progression of pathogenesis in Iranian MS can be related to chronic and direct oxidative damage of genomic DNA not nucleotide pools.

Tayebeh Khodabakhshi, Farimah Beheshti, Mahmoud Hosseini, Seyed Mojtaba Mousavi, Hassan Rakhshandeh, Hamid Reza Sadeghnia, Azita Aghaei,
Volume 21, Issue 4 (12-2017)

Introduction: A relationship between epileptic seizures and brain tissue oxidative damage has been suggested. Ocimum basilicum (O. basilicum) has been shown to have beneficial effects including hypnotic and protective against tissue oxidative damage. The present study was designed to evaluate the effects of O. basilicum hydro-alcoholic extract on oxidative damage of brain tissue following seizures induced by pentylenetetrazole (PTZ) in mice. Methods: The animals were grouped and treated as follows: 1- control group which received saline; 2- PTZ group (90 mg/kg, ip); 3 to 5- three groups which received 25, 50 or 100 mg/kg of a hydro-ethanolic extract of O. basilicum before PTZ. First minimal clonic seizure (MCS) and the first generalized tonic-clonic seizure (GTCS) latencies were analyzed. The brains of the animals were then collected and stored to use for biochemical evaluation. Results: The plant extract in 50 and 100 mg/kg doses, significantly postponed the MCS and GTCS seizures onsets (P<0.05-P<0.01) when administered before PTZ. PTZ - induced seizures also increased lipid-peroxidation in the brain tissue which was presented by a high level of malondialdehyde (MDA) in the brain tissue compared to the control group (P<0.001). O. basilicum extract attenuated MDA levels in the brain (P<0.05-P<0.001). PTZ - induced seizures also decreased brain tissue total thiols compared to the control group (P<0.001). Pretreatment with all doses of O. basilicum extract improved thiol content in the brain tissue (P<0.05). Conclusion: The current study revealed that hydro-ethanolic extract of O. basilicum possesses significant antioxidant and anticonvulsant activities.

Samira Yazdanimehr, Mohammad Taghi Mohammadi,
Volume 22, Issue 1 (3-2018)

Introduction: According to the powerful antioxidant effects of rosuvastatin, the present study aimed to examine the protective effects of rosuvastatin against oxidative damage of diabetic pancreas by potentiation of the antioxidant capacity in streptozotocin-induced diabetic rats. Methods: Experiment was performed in four groups of male Wistar rats (n=6 in each group): normal, diabetic and two treatment groups (normal and diabetic rats treated with rosuvastatin). Rats were made diabetic by a single intravenous injection of streptozotocin (40 mg/kg) at the beginning of study. Treatment groups received orally rosuvastatin at dose of 10 mg/kg/day. After eight weeks, the pancreas tissues were removed under deep anesthesia. After tissue homogenization, the contents of glutathione and malondialdehyde (MDA) as well as superoxide dismutase (SOD) activity were assessed by biochemical methods. Results: Blood glucose of diabetic rats was above 350 mg/dl. The MDA content of the homogenized pancreas significantly increased in diabetic rats by 92%. Diabetes also decreased the content of glutathione (32%) as well as SOD activity (68%) of pancreas tissues. Treatment with rosuvastatin noticeably decreased the MDA levels of diabetic pancreas (90%). Moreover, rosuvastatin significantly increased the glutathione content (21%) and SOD activity (67%) of pancreas tissues in treated diabetic rats. Conclusion: Our findings reveal that rosuvastatin is able to attenuate the uncontrolled hyperglycemia-induced oxidative damage of pancreas through potentiation of the antioxidant defense system.

Zakieh Keshavarzi, Fatemeh Nurmohammadi, Saba Majlesi, Fatemeh Maghool,
Volume 23, Issue 1 (3-2019)

Introduction: Walnuts (Juglans regia), has been shown to exert anti-inflammatory and antioxidant effects. The present study was designed to evaluate the anti-inflammatory and antioxidant effects of walnut extract (WE) on an experimental model of ulcerative colitis caused by intracolonic administration of acetic acid in rats. Methods: A total number of 30 rats were used, randomly assigned to five groups of 6 rats each. Group I: colitis without treatment (colitis control), group II: normal animals (normal control), in groups III and IV colitis induced rats were treated with WE (10 and 20mg/kg) for 8 consecutive days, and group V were treated with sulfasalazine (SLS, 200mg/kg) as a standard drug. Several parameters, including macroscopic and histopathological scores and malondialdehyde (MDA), total sulfhydryl (SH) groups, colonic superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities were measured using standard assay procedures. Results: Results revealed that treatment with 10mg/kg WE for 8 days attenuated the macroscopic and histopathological colonic damage scores as well as colonic levels of MDA, while increased the levels of total SH, SOD and GPx compared with colitis untreated group. The 20mg/kg dose had no protective effects. Conclusion: These findings suggest that protective effect of WE in the experimental model of colitis could be through an antioxidant mechanism.

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