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Öğe 3?,4?-Dihydroxyflavonol attenuates spatial learning and memory impairments in global cerebral ischemia(Taylor & Francis Ltd, 2017) Oz, Mehmet; Demir, Enver Ahmet; Caliskan, Merve; Mogulkoc, Rasim; Baltaci, Abdulkerim Kasim; Atalik, K. Esra NurullahogluObjectives: In the present study, effects of 3', 4'-dihydroxyflavonol (DiOHF) on anxiety-like behavior, and learning and memory were investigated in a model of transient global cerebral ischemia and reperfusion. Methods: The animals were assigned to sham-operated, ischemia, and two DiOHF-treated (10 mg/kg i. p.) groups. DiOHF was administered at 1 hour before and immediately after the ischemia. Male rats were subjected to bilateral common carotid artery occlusion to induce acute cerebral ischemia for 20 minutes, followed by reperfusion for 7 days. The openfield, elevated plus maze (EPM), and Morris water maze tests were used to evaluate the effects of DiOHF treatment on ischemia-induced locomotor activity, anxiety-like behavior, and spatial and recognition memory impairments, respectively. Results: In the open field test, locomotor activity in the ischemic rats was not altered 6 days after the ischemia, nor was anxiety-like behavior, which was evaluated with the EPM (P > 0.05). In the water-maze test, cerebral ischemia significantly decreased the exploration time in the target quadrant, and the platform crossing counts were lower (P < 0.05) in the probe trial test; this memory impairment was significantly improved by DiOHF applied 1 hour before and immediately after ischemia (P < 0.05). Discussion: All together, these findings suggest that DiOHF reverses spatial learning and memory deficits resulting from transient global ischemia but has no significant effect on anxiety-like behavior.Öğe Curcumin alleviates cisplatin-induced learning and memory impairments(Academic Press Inc Elsevier Science, 2015) Oz, Mehmet; Atalik, K. Esra Nurullahoglu; Yerlikaya, F. Humeyra; Demir, Enver AhmetThe present study has been designed to investigate the role of curcumin on cisplatin-inducedcognitive impairment and to reveal mechanisms of cisplatin's detrimental actions on cognition in rats. Animals were treated with cisplatin (5 mg/kg/week) and/or curcumin (300 mg/kg/day) for 5 weeks. Morris water maze test was used to assess spatial learning and memory. Enzymatic activities of acetylcholinesterase (AChE) and superoxide dismutase (SOD) were evaluated from hippocampus and plasma samples, and malondialdehyde (MDA), which is the end-product of lipid peroxidation, was determined by a colorimetric method. Our results showed that cisplatin (5 mg/kg/week, 5 weeks) caused learning and memory deficits, elevated MDA content, decreased SOD activity in the hippocampus and plasma, and AChE activity in the hippocampus. Curcumin improved learning and memory in rats with administration of cisplatin. In addition, curcumin significantly reduced the level of MDA and increased the activities of SOD and AChE. Taken together, our findings indicate that curcumin ameliorates cisplatin-induced spatial learning and memory impairment, possibly through restored cholinergic function and enhanced oxidative status. (C) 2015 Elsevier Inc. All rights reserved.Öğe Curcumin improves spatial memory and decreases oxidative damage in aged female rats(Springer, 2013) Belviranli, Muaz; Okudan, Nilsel; Atalik, Kismet Esra Nurullahoglu; Oz, MehmetAging induced cognitive impairment has been well documented for many years and several antioxidant strategies have been developed against this impairment. Curcumin is the active component of curcuma longa and has shown antioxidant, antiinflamatory and neuroprotective properties. We hypothesized that curcumin would have an influence on cognitive functions in aged female rats. The purpose of the present study was to investigate the effects of curcumin supplementation on cognitive impairment evaluated by Morris water maze (MWM) as well as the oxidative stress induced by aging in female rats. Rats were randomly divided into either control or curcumin-supplemented groups. Curcumin or vehicle (corn oil) were given once daily for a period of 12 days, beginning 7 days prior to and 5 days during the behavioral tests. Behavioral assessment was performed in MWM. At the end of the behavioral test, blood samples and brain tissues were taken for the analysis of malondialdeyde (MDA), protein carbonyl and glutathione levels. During the training session, curcumin supplementation decreased latency to reach to the platform and the total distance traveled. During the probe trial, curcumin supplementation increased the number of platform crossings. In addition to the behavioral testing, biochemical results showed that MDA levels decreased in brain tissue by curcumin supplementation. It may be concluded that, curcumin supplementation improves cognitive functions by decreasing the lipid peroxidation in brain tissue of aged female rats.Öğe THE EFFECT OF ENVIRONMENTAL ENRICHMENT AND WESTERN DIET ON THE TRACE ELEMENT STATUS AND OXIDATIVE STRESS IN RATS(Nobel Ilac, 2020) Can, Ummugulsum; Yerlikaya, Fatma Humeyra; Oz, Mehmet; Atalik, Kismet Esra Nurullahoglu; Gergerlioglu, Hasan SerdarObjective:The Western diet (WD), which is rich in highfat diet (HFD) and high-sucrose diet (HSD), is related to oxidative stress. Enriched environment (EE) with social interaction, physical exercise and continuous learning tasks has been shown to reduce oxidative stress, the inflammatory response, and increase the anti-oxidative defense. Therefore, the present study has aimed to clarify the effects of the EE and WD-fed rats on marker malondialdehyde (MDA) and trace element (TE) levels (iron [Fe], copper [Cu], zinc [Zn], chromium [Cr], selenium [Se], magnesium [Mg] and molybdenum [Mo]). Material and Method: Male Wistar albino rats were housed in either an enrichment (n=24) or standard environment (n=24) and fed with HFD (35% of energy as fat) (n=8), HSD (100% of carbohydrate as sucrose) (n=8), or standard rat chow(n=8), for 4 weeks. Inductively-coupled plasma mass spectrometry was used for determination of the serum TE levels. Results: The serum levels of MDA (p<0.05), Fe, Cu, Mo and Mg increased, while the serum levels of Cr and Se decreased, and additionally, the serum levels of Zn did not changed in the HFD and HSD groups. EE decreased partially the serum levels of MDA, Fe, Mo, and did not affect the serum levels of Cu, while it increased the serum levels of Mg, Cr, Se and Zn; however, there was no significant difference between all of the experimental groups (all; p>0.05). Conclusions: Our study demonstrated that HFD and HSD led to oxidative stress and adversely affected the serum level of TE in rats, and that the EE reversed partially this status.Öğe The effect of isotretinoin therapy on oxidative damage in rats(Wiley, 2020) Daye, Munise; Belviranli, Muaz; Okudan, Nilsel; Mevlitoglu, Inci; Oz, MehmetIsotretinoin is prescribed in many dermatologic disorders, but mostly in acne. There is limited research about oxidative stress induced by isotretinoin and its effects on the liver tissue, muscle tissue, and blood. In this study, oxidative damage of isotretinoin on the liver, muscles, and blood in rats at the therapeutic dosage for humans, is evaluated. Thirty, 2-months-old Wistar albino rats were randomly divided into four groups. Isotretinoin was administered at the human equivalent low dose of 7.5 mg/kg by gavage. Blood, liver, and skeletal muscle samples were taken from the animals under anesthesia. Oxidative stress and antioxidant defense markers such as Malondialdehyde (MDA), Protein carbonyl (PC), 8-OHDG (8-hydroxy-deoxyguanosine), SOD (Superoxide dismutase), GSH(Glutathione), GPX (glutathione peroxidase), NO (Nitric Oxide) levels, Aspartate aminotransferase (AST), Alanine aminotransferase (ALT), and creatine kinase (CK) levels were measured. There were significant differences between the ALT values of the control group and the third month of isotretinoin treatment group. Oxidative stress markers such as 8-OHDG, PC, GSH, GPX, and NO values significantly differed in month 3. SOD was significantly lower in the treatment groups compared to the control group. Our study supports that the levels of oxidative markers are increasing with the isotretinoin treatment so this may flare acne. GPX levels increased at the muscle tissue level, and may be responsible for the myopathy that is seen in acne patients. Addition of antioxidants to isotretinoin treatment may be beneficial in reducing oxidative damage.Öğe Effects of Cisplatin and Curcumin on the Hypothalamic-Pituitary-Adrenal Axis(Wiley-Blackwell, 2015) Oz, Mehmet; Demir, Enver Ahmet; Gergerlioglu, Hasan Serdar; Atalik, Kismet Esra Nurullahoglu; Yerlikaya, Fatma Humeyra[Abstract Not Availabe]Öğe The Effects of Electrocautery on Peripheral Nerve: An Experimental Study(Thieme Medical Publ Inc, 2016) Karalezli, Nazim; Koktekir, Ender; Yildirim, Serhat; Toy, Hatice; Oz, Mehmet; Yuceturk, AydinBackground The aim of this study was to assess the usability of an electrocautery device as nerve stimulator and to investigate histopathologically the adverse effects of electrocautery at low power on rat sciatic nerves. Methods A total of 36 female Sprague-Dawley albino rats were divided into six groups according to the power applied to their sciatic nerves (1, 2, 3, 4, 5 and 6 W, respectively). Pathologic changes were studied by microscopic examination and scored (no change = 0, mild = 1, moderate = 2, severe = 3). Multiple comparisons were provided for all groups by the Bonferroni test (one-way analysis of variance). A p value < 0.05 was accepted as statistically significant. Results The average scores were 2.66 +/- 0.51, 3.66 +/- 0.51, 5.83 +/- 1.83, 10.0 +/- 1.78, 11.0 +/- 1.54, and 13.8 +/- 0.89 in groups 1 to 6, respectively. Significant differences were found between all groups (p < 0.01), except between groups 1 and 2, groups 2 and 3, and groups 4 and 5 (p > 0.05) Variable motor responses and foot deformities were observed at the different power levels. Conclusion Although electrocautery devices provoke motor responses if getting in contact with peripheral nerves as do nerve stimulators, their use induces histopathologically adverse effects even at the lowest power. Their use around peripheral nerves should be avoided.Öğe Effects of Exercise Training and Coenzyme Q10 Supplementation on Oxidative Stress and Antioxidant Defense Markers in Heart Tissue of Aged Rats(Wiley-Blackwell, 2015) Okudan, Nilsel; Belviranli, Muaz; Ozdemir, Ayse; Oz, Mehmet[Abstract Not Availabe]Öğe Effects Of Exercise Training And Coenzyme Q10 Supplementation On Pentraxin-3 And Paraoxonase Activities In Aged Rats(Lippincott Williams & Wilkins, 2013) Belviranli, Muaz; Okudan, Nilsel; Kumak, Ayse; Nurullahuglu-Atalik, Kismet Esra; Oz, Mehmet[Abstract Not Availabe]Öğe Effects of the Environmental Enrichment on Learning and Memory in High-Fat Diet-Fed Rats(Wiley-Blackwell, 2015) Oz, Mehmet; Demir, Enver Ahmet; Gergerlioglu, Hasan Serdar; Atalik, Kismet Esra Nurullahoglu; Yerlikaya, Fatma Humeyra[Abstract Not Availabe]Öğe Environmental enrichment reverses cognitive impairments provoked by Western diet in rats: Role of corticosteroid receptors(Pergamon-Elsevier Science Ltd, 2016) Gergerlioglu, Hasan Serdar; Oz, Mehmet; Demir, Enver Ahmet; Nurullahoglu-Atalik, Kismet Esra; Yerlikaya, Fatma HumeyraAims: Previous studies demonstrated that the Western diet (WD), which is rich in saturated fat (HFD) and refined sugar (HSU), is related to the impairments of hippocampus-dependent learning and memory and forebrain synaptic plasticity in rodents. The environmental enrichment (EE) has been shown to enhance learning and memory in theHFD-induced cognitive deficits, but the exact mechanismis still not clearly understood. Therefore, the present study aimed to clarify the effects of the EE on spatial memory in WD-fed rats, and to analyze the potential role of corticosteroid receptors in the EE conditioning. Main methods: MaleWistar albino rats were housed in either an enriched or standard environment and fed with the HFD (35% of energy as fat), HSU (100% of carbohydrate as sucrose) or standard rat chowfor 4 weeks. Weused the Morris' water maze test (MWM) to assess the learning and memory performance, and measured plasma levels of corticosterone (CORT) and adrenocorticotropic hormone (ACTH), as well as glucocorticoid (GR) and mineralocorticoid receptor (MR) levels in the hippocampus. Key findings: The results showed that HFD-fed rats displayed poorer learning and memory performance evaluated with MWM than controls. The EE reversed the cognitive deficits caused by the HFD. In addition, the EE resulted in an increase of GR and MR levels without affecting plasma CORT and ACTH concentrations. Significance: Based on these findings, it could be suggested that the EE plays an important role in amelioration of the HFD-induced cognitive impairments, but this intervention is independent of the hypothalamic-pituitaryadrenal axis and hippocampal corticosteroid receptor levels. (C) 2016 Elsevier Inc. All rights reserved.Öğe Impact of enriched environment on production of tau, amyloid precursor protein and, amyloid-? peptide in high-fat and high-sucrose-fed rats(Cambridge Univ Press, 2017) Selvi, Yavuz; Gergerlioglu, Hasan Serdar; Akbaba, Nursel; Oz, Mehmet; Kandeger, Ali; Demir, Enver Ahmet; Yerlikaya, Fatma HumeyraObjective: The Western-type diet is associated with an elevated risk of Alzheimer's disease and other milder forms of cognitive impairment. The aim of the present study was to investigate the effects of the environmental enrichment on amyloid and tau pathology in high-fat and high-sucrose-fed rats. Methods: In total, 40 adult male rats were categorised into two main groups according to their housing conditions: enriched environment (EE, n = 16) and standard housing condition (n = 24). The groups were further divided into five subgroups that received standard diet, high-fat diet, and high-sucrose diet. We performed the analysis of amyloid beta-peptide (A beta) (1-40), A beta(1-42), amyloid precursor protein (APP), and tau levels in the hippocampus of rats that were maintained under standard housing conditions or exposed to an EE. Results: The EE decreased the A beta(1-40), A beta(1-42), APP, and tau levels in high-fat and high-sucrose-fed rats. Conclusion: This observation shows that EE may rescue diet-induced amyloid and tau pathology.Öğe Interaction of Nitrergic and Cholinergic Systems on Anxiety and Depression-Like Behaviors in Diabetic Rats with Streptozotocin(Wiley, 2023) Oz, Mehmet; Aslanlar, Durmus Ali; Atalik, Kismet Esra Nurullahoglu[Abstract Not Availabe]Öğe N-acetylcysteine ameliorates chemotherapy-induced impaired anxiety and depression-like behaviors by regulating inflammation, oxidative and cholinergic status, and BDNF release(Elsevier, 2024) Aslanlar, Durmus Ali; Visneci, Emin Fatih; Oz, Mehmet; Atalik, K. Esra NurullahogluMood disorders caused by chemotherapy have become more important as the survival of cancer patients increases, and new studies in this field will contribute to the prevention of this disorder. For this purpose, we used methotrexate, a chemotherapeutic agent frequently preferred in oncological cases. Mtx was administered as a single dose of 100 mg/kg intraperitoneally to male Wistar albino rats. Since oxidative stress plays an important role in chemotherapy-induced emotional impairment, n-acetylcysteine (NAC), a potent antioxidant, was administered at 500 mg/kg in two doses before Mtx administration. We evaluated anxiety and depression-like behaviors 24 h after Mtx administration, as well as some oxidative and inflammatory markers in blood serum and hippocampal tissue, acetylcholinesterase activity (AChE), and brain-derived neurotrophic factor (BDNF) release in hippocampal tissue. In rats, Mtx induced anxiety and depression-like behaviors as well as abnormalities in oxidative and inflammatory markers in blood serum and hippocampal tissue, increased AChE activity in hippocampal tissue, and decreased BDNF release. NAC treatment was found to ameliorate Mtx-induced anxiety and depression-like behaviors, increase antioxidant capacity, reduce oxidative stress and inflammatory response, and regulate AChE activity and BDNF release. In conclusion, the fact that NAC treatment of Mtx was effective is important for revising the treatment strategies for individuals suffering from this disorder, and this effect is thought to be related to the antioxidant and anti-inflammatory power of NAC.