Browsing by Author "Armutcu, F"

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Attenuation of Bleomycin-Induced Lung Fibrosis by Oral Sulfhydryl Containing Antioxidants in Rats
(Academic Press Ltd Elsevier Science Ltd, 2005) Yidirim, Z; Kotuk, M; Iraz, M; Kuku, I; Ulu, R; Armutcu, F; Ozen, S
Antioxidant therapy may be useful in diseases with impaired oxidant antioxidant balance such as lung fibrosis. The effects of sulfhydryl-containing antioxidant agents N-acetylcysteine (NAC) and erdosteine on the bleomycin-induced lung fibrosis were compared in rats. The animals were divided into four groups: Vehicle + vehicle, vehicle + bleomycin (2.5 U/kg), bleomycin + erdosteine (10 mg/kg), and bleomycin + NAC (3 mmol/kg). Bleomycin administration resulted in prominent lung fibrosis as measured by lung hydroxylproline content and lung histology which is almost completely prevented by erdosteine and NAC. Hydroxyproline content was 18.7 +/- 3.5 and 11.2 +/- 0.6 mg/g dried tissue in bleomycin and saline treated rats, respectively (P < 0.001), and this level was 11.3 +/- 1.2 and 13.8 +/- 1.2 mg/g dried tissue in erdosteine and NAC pretreated, respectively. Erdosteine and NAC significantly reduced depletion of glutathione peroxidase, and prevented increases in myeloperoxidase activities, nitric oxide, and malondialdehyde levels in lung tissue produced by bleomycin. Data presented here indicate that erdosteine and NAC similarly prevented bleomycin-induced lung fibrosis and their antioxidant effects were also similar in this experiment. (c) 2005 Elsevier Ltd. All rights reserved.
Effects of Aminoguanidine and Antioxidant Erdosteine on Bleomycin-Induced Lung Fibrosis in Rats
(Academic Press inc Elsevier Science, 2004) Yildirim, Z; Turkoz, Y; Kotuk, M; Armutcu, F; Gurel, A; Iraz, M; Akyol, O
Reactive oxygen and nitrogen species have been implicated in the pathogenesis of bleomycin -induced lung fibrosis. The effects of aminoguanidine and erdosteine on the bleomycin-induced lung fibrosis were evaluated in rats. The animals were placed into five groups: Vehicle + vehicle, vehicle + bleomycin (2.5U/kg), bleomycin + aminoguanidine (200mg/kg), bleomycin + erdosteine (10mg/kg), and bleomycin + erdosteine + aminoguanidine. Bleomycin administration resulted in prominent lung fibrosis as measured by lung hydroxyproline content and lung histology, which is completely prevented by erdosteine and aminoguanidine. A strong staining for nitro tyrosine antibody in lung tissue and increased levels of lung NO were found in bleomycin group, that were significantly reduced by aminoguanidine and erdosteine. Aminoguanidine and erdosteine significantly prevented depletion of superoxide dismutase and glutathione peroxidase and elevated myeloperoxidase activities, malondialdehyde level in lung tissue produced by bleomycin. Data presented here indicate that aminoguanidine and erdosteine prevented bleomycin-induced lung fibrosis and that nitric oxide mediated tyrosine nitration of proteins plays a significant role in the pathogenesis of bleomycin-induced lung fibrosis. Also our data suggest that antifibrotic affect of antioxidants may be due to their inhibitory effect on nitric oxide generation in this model. (C) 2004 Elsevier Inc. All rights reserved.
Erdosteine Prevents Bleomycin-Induced Pulmonary Fibrosis in Rats
(Elsevier, 2004) Sogut, S; Ozyurt, H; Armutcu, F; Kart, L; Iraz, M; Akyol, O; Yildirim, Z
Oxidative stress plays an important role in the pathogenesis of idiopathic pulmonary fibrosis. Therefore, erdosteine, an antioxidant, is expected to have an inhibitor potential against the disease. Rats were given one dose of bleomycin in pulmonary fibrosis groups and saline in controls. The first dose of oral erdosteine (10 mg/kg/day) was given 2 days before the bleomycin injection to achieve the plateau level in blood and continued until killing. At day 14, fibrotic changes were evaluated, using Aschoft's criteria and lung hydroxyproline content. Bleomycin produced a fivefold increase in fibrosis score that was decreased by 87% by erdosteine (P>0.001) and almost twofold increases in hydroxyproline content which were completely prevented by erdosteine. Myeloperoxidase activities and MDA levels, which were significantly higher in the bleomycin group, were then significantly attenuated by erdosteine. These results revealed that oral erdosteine may prevent the development of acute pulmonary inflammation caused by bleomycin injection via the repression of neutrophil accumulation and lipid peroxidation, resulting in the inhibition of subsequent lung fibrosis. (C) 2004 Elsevier B.V. All rights reserved.
Ginkgo Biloba Prevents Mobile Phone-Induced Oxidative Stress in Rat Brain
(Elsevier, 2004) Ilhan, A; Gurel, A; Armutcu, F; Kamisli, S; Iraz, M; Akyol, O; Ozen, S
Background: The widespread use of mobile phones (MP) in recent years has raised the research activities in many countries to determine the consequences of exposure to the low-intensity electromagnetic radiation (EMR) of mobile phones. Since several experimental studies suggest a role of reactive oxygen species (ROS) in EMR-induced oxidative damage in tissues, in this study, we investigated the effect of Ginkgo biloba (Gb) on MP-induced oxidative damage in brain tissue of rats. Methods: Rats (EMR+) were exposed to 900 MHz EMR from NIP for 7 days (1 h/day). In the EMR + Gb groups, rats were exposed to EMR and pretreated with Gb. Control and Gb-administrated groups were produced by turning off the mobile phone while the animals were in the same exposure conditions. Subsequently, oxidative stress markers and pathological changes in brain tissue were examined for each groups. Results: Oxidative damage was evident by the: (i) increase in malondialdehyde (MDA) and nitric oxide (NO) levels in brain tissue, (ii) decrease in brain superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities and (iii) increase in brain xanthine oxidase (XO) and adenosine deaminase (ADA) activities. These alterations were prevented by Gb treatment. Furthermore, Gb prevented the MP-induced cellular injury in brain tissue histopathologically. Conclusion: Reactive oxygen species may play a role in the mechanism that has been proposed to explain the biological side effects of MP, and Gb prevents the MP-induced oxidative stress to preserve antioxidant enzymes activity in brain tissue. (C) 2003 Elsevier B.V. All rights reserved.