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  • Küçük Resim
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    The protective effect of erythropoietin and dimethylsulfoxide on ischemia-reperfusion injury in rat ovary
    (Elsevier Science Bv, 2010) Ergun, Yasar; Koc, Ahmet; Dolapcioglu, Kenan; Akaydin, Yesim; Dogruer, Gokhan; Kontas, Tunay; Kozlu, Tolunay
    Objectives: The aim of this study was to investigate the effects of erythropoietin and dimethylsulfoxide in the recovery from ischemia-reperfusion injury in an experimental rat adnexal torsion model. Study design: Thirty-six Wistar-albino rats were divided into six groups. Except for the sham operation group, all groups were subjected to left unilateral adnexal torsion for 3 h. Erythropoietin and dimethylsulfoxide were intraperitoneally administered 30 min before the detorsion operation. Malondialdehyde and nitric oxide levels were detected from both the plasma and the tissue samples. The sections of the tissues were evaluated histologically. The results were analyzed by a one-way analysis of the variance (ANOVA) followed by the Duncan test for multiple comparisons using computer software, SPSS Version 15.0 for Windows. Results: This study demonstrated that dimethylsulfoxide and erythropoietin pretreatment attenuated ischemia-reperfusion-induced lipid peroxidation, prevented post-ischemic ovarian injury and helped to maintain the ovarian morphology. Malondialdehyde levels of plasma and ovary were higher in the torsion and detorsion groups than the sham group. This showed that ischemia-reperfusion had caused lipid peroxidation of the ovarian tissue, thus leading to oxidative damage. One of the major findings of this study is that malondialdehyde was significantly decreased in the plasma of rats who were pre-treated with dimethylsulfoxide and erythropoietin before detorsion. This suggests that dimethylsulfoxide and erythropoietin might prevent oxidative damage in ovarian ischemia-reperfusion injury. Histological examination confirmed that reperfusion caused more detrimental effects than only ischemia, which could be at least partially prevented by dimethylsulfoxide and erythropoietin administration prior to detorsion. Conclusion: Erythropoietin and dimethylsulfoxide may have beneficial effects in ischemia-reperfusion injury in ovarian torsion. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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    Protective effects of N-acetylcysteine on cyclosporine-A-induced nephrotoxicity
    (Taylor & Francis Ltd, 2008) Duru, Mehmet; Nacar, Ahmet; Yonden, Zafer; Kuvandik, Gfiven; Helvaci, Mehmet Rami; Koc, Ahmet; Akaydin, Yesim
    Objectives. Cyclosporine A (CsA) is used for the treatment of autoimmune and inflammatory disorders. However, CsA-induced nephrotoxicity remains an important clinical problem, and oxidative stress has been implicated as a possible responsible mechanism. We assessed the protective ability of N-acetylcysteine (NAC), an antioxidant, against CsA-induced nephrotoxicity. Materials and Methods. Wistar albino rats were randomly assigned into four groups. Group I rats were treated with sodium chloride as control, group 2 with CsA, group 3 with CsA and NAC, and group 4 with NAC alone. Animals were sacrificed and blood samples were analyzed for blood urea nitrogen (BUN), serum creatinine (Cr), malondialdehyde (MDA) and nitric oxide (NO) levels, and superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities. Kidney sections were analyzed for MDA and NO levels and SOD and GSH-Px activities, as well as histopathological changes. Results. Overall, the treatment of rats with CsA alone produced significant increases in NO and MDA levels and significant decreases in SOD and GSH-Px activities in serum and renal samples. Morphological changes, including tubular epithelial atrophy, vacuolizations, and cellular desquamations, were clearly observed in the rats treated with CsA alone. Concurrent NAC administration with CsA improved renal function, as indicated by lower BUN and Cr values. Moreover, NAC significantly reduced MAD and NO levels and increased SOD and GSH-Px activities in serum and renal tissue, as well as provided a histologically proven protection against CsA-induced nephrotoxicity. Conclusion. These results indicate that NAC produces a protective mechanism against CsA-induced nephrotoxicity and suggest a role for oxidative stress in pathogenesis.
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    Subacute toxicity of piperonyl butoxide and resmethrin in mice
    (Academic Journals, 2012) Urek, Selma Yazar; Baydan, Emine; Yurdakok, Begum; Akaydin, Yesim; Kozlu, Tolunay; Tunca, Ayse
    The subacute toxic effects of separate and combined use of piperonyl butoxide and resmethrin (cismethrin) on the liver and kidneys of male mice were investigated. It is known that when given alone, pyrethroids are toxic and their toxicity becomes more complicated when they are co-formulated with piperonyl butoxide. In the present study, macroscopic and microscopic changes were determined in the liver and kidney tissues. Furthermore, biochemical alterations and clinical neurotoxic effects were observed. Toxic effects were more evident in the group subjected to combined use. The results obtained demonstrated that, in mice, piperonyl butoxide and resmethrin are directly toxic to the liver and kidneys. The toxic effects and tissue degeneration were more widespread in the group subjected to combined use.