Person: ŞİRVANCI, SERAP
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ŞİRVANCI
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SERAP
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Publication Metadata only L-Carnitine ameliorates methotrexate-induced oxidative organ injury and inhibits leukocyte death(SPRINGER, 2006) YEGEN, BERRAK; Sener, G; Eksioglu-Demiralp, E; Cetiner, M; Ercan, F; Sirvanci, S; Gedik, N; Yegen, BCMethotrexate (MTX), a folic acid antagonist widely used for the treatment of a variety of tumors and inflammatory diseases, affects normal tissues that have a high rate of proliferation, including the hematopoietic cells of the bone marrow and the gastrointestinal mucosal cells. To elucidate the role of free radicals and leukocytes in MTX-induced oxidative organ damage and the putative protective effect of L-carnitine (L-Car), Wistar albino rats were administered a single dose of MTX (20 mg/kg) followed by either saline or L-Car (500 mg/kg) for 5 days. After decapitation of the rats, trunk blood was obtained, and the ileum, liver, and kidney were removed for histological examination and for the measurement of malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, and collagen content. Our results showed that MTX administration increased the MDA and MPO activities and collagen content and decreased GSH levels in all tissues, while these alterations were reversed in L-Car-treated group. The elevated serum TNF-alpha level observed following MTX treatment was depressed with L-Car. The oxidative burst of neutrophils stimulated by Annexin V was reduced in the saline-treated MTX group, while L-Car abolished this inhibition. Similarly, flow cytometric measurements revealed that leukocyte apoptosis was increased in MTX-treated animals, while L-Car reversed these effects. Severe degeneration of the intestinal mucosa, liver parenchyma, and glomerular and tubular epithelium observed in the saline-treated MTX group was improved by L-Car treatment. These results suggest that L-Car, possibly via its free radical scavenging and antioxidant properties, ameliorates MTX-induced oxidative organ injury and inhibits leukocyte apoptosis. Thus, supplementation with L-Carnitine as an adjuvant therapy may be promising in alleviating the systemic side-effects of chemotherapeutics.Publication Metadata only Taurine protects against methotrexate-induced toxicity and inhibits leukocyte death(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2005) YEGEN, BERRAK; Cetiner, M; Sener, G; Sehirli, AO; Eksioglu-Demiralp, E; Ercan, F; Sirvanci, S; Gedik, N; Akpulat, S; Tecimer, T; Yegen, BCThe efficacy of methotrexate (MTX), a widely used cytotoxic chemotherapeutic agent, is often limited by severe side effects and toxic sequelae. Regarding the mechanisms of these side effects, several hypotheses have been put forward, among which oxidative stress is noticeable. The present study was undertaken to determine whether taurine, a potent free radical scavenger, could ameliorate MTX-induced oxidative injury and modulate immune response. Following a single dose of methotrexate (20 mg/kg), either saline or taurine (50 mg/kg) was administered for 5 days. After decapitation of the rats, trunk blood was obtained and the ileum, liver, and kidney were removed to measure malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, and collagen content, as well as histological examination. Our results showed that MTX administration increased the MDA, MPO activity, and collagen contents and decreased GSH levels in all tissues (P < 0.001), while these alterations were reversed in taurine-treated group (P < 0.05-0.01). Elevated (P < 0.001) TNF-alpha level observed following MTX treatment was depressed with taurine (P < 0.01). Oxidative burst of neutrophils stimulated by phorbol myristate acetate was reduced in saline-treated MTX group (P < 0.001), while taurine abolished this effect. Similarly, flow cytometric measurements revealed that leukocyte apoptosis and cell death were increased in MTX-treated animals, while taurine reversed these effects (P < 0.05). Reduced cellularity in bone marrow samples of MTX-treated group (P < 0.01) was reversed back to control levels in taurine-treated rats. Severe degeneration of the intestinal mucosa, liver parenchyma, glomerular, and tubular epithelium observed in saline-treated group was improved by taurine treatment. In conclusion, it appears that taurine protects against methotrexate-induced oxidant organ injury and inhibits leukocyte apoptosis and may be of therapeutic potential in alleviating the systemic side effects of chemotherapeutics. (c) 2005 Published by Elsevier Inc.Publication Metadata only The Effects of Riluzole on Neurological, Brain Biochemical, and Histological Changes in Early and Late Term of Sepsis in Rats(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2009) ERCAN, FERİHA; Toklu, Hale Z.; Uysal, Meral Keyer; Kabasakal, Levent; Sirvanci, Serap; Ercan, Feriha; Kaya, MehmetObjective. One of the underlying mechanisms of sepsis is thought to be the oxidative damage due to the generation of free radicals. Glutamate, the major excitatory amino acid in the brain, is known to play an important role in blood brain barrier (BBB) permeability, brain edema, and oxidative damage in pathological conditions. Riluzole, a glutamate release inhibitor, has been shown to have neuroprotective effects in several animal models. The aim of our study was to investigate the putative protective effect of riluzole against sepsis-induced brain injury. Methods. Sepsis was induced by cecal ligation and puncture in Wistar albino rats. Sham operated (control) and sepsis groups received either saline or riluzole (6 mg/kg, s.c.) 30 min after the surgical procedure, and every 12 h as continuing treatment. The effect of riluzole on the survival rate, weight loss, fever, leukocyte count, brain edema, BBB permeability, oxidative damage, and histological observations were evaluated for early (6 h) and late (48 h) phase of sepsis. Results. Riluzole, when administered 6 mg/kg s.c., diminishes the sepsis-induced augmentation in weight loss, body temperature, brain edema, increase in BBB permeability, oxidative damage, and brain injury that is observed histologically. Besides increasing the survival rate in sepsis, it has also improved neurological examination scores and the prognosis of the disease. Conclusion. According to the results of this study, riluzole appears to have a protective effect for sepsis-induced encephalopathy. (C) 2009 Elsevier Inc. All rights reserved.