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Articles by Candan Ozogul
Total Records ( 2 ) for Candan Ozogul
  Yildiz Guney , Ayse Bilgihan , Ayse Hicsonmez , Aysen Dizman , Candan Ozogul , Meltem Nalca Andrieu and Cengiz Kurtman
  The purpose of this study was to establish the impact of oxidative stress in the damaged brain tissue, irradiated with two different dose levels, a single dose of 8 and 15 Gy. In addition, the histological findings caused by ionizing radiation in the early period was investigated. The levels of MDA, GSH, SOD, CAT, GSH-Px and selenium were estimated in brain tissue. For the histological examination, brain tissues were examined at photo light microscope.

MDA contents of brain after 8 Gy and 15 Gy γ-irradiation were markedly elevated compared with group 1. Brain SOD activity decreased after exposure to 15 Gy γ-irradiation, there was a significant difference compared with group 1 and group 2. Brain GSH-Px activity in group 2 and group 3 was enhanced when compared with group 1. CAT activity of brain after 15 Gy γ-irradiation was markedly decreased compared with group 1 and group 2. GSH levels were significantly lower in group 2 and 3 when compared with group 1. In this study, brain selenium levels were not found to be markedly changed after irradiation. In group 3 basal membrane structure was found to be highly thicker when compared group 1 and group 2.

As a result, in the early period, high doses of ionizing radiation (8 Gy and 15 Gy) influences the oxidant-antioxidant system in guinea-pig brain, after the formation of LPO, antioxidant levels alter and this may play a role in reducing tissue damage caused by RT whereas the histologic changes occur when the dose is increased.

  Aysel Kukner , Neriman Colakoglu , Candan Ozogul , Mustafa Naziroglu and Tulin Firat
  Diabetic nephropathy is a serious complication of diabetes mellitus. Oxidative stress has been suggested to play a key role in the pathogenesis of diabetic nephropathy. Vitamins C and E play important roles in the antioxidant defense system. It is likely that both vitamins act in a synergistic manner, with vitamin E primarily being oxidized to the tocopheroxyl radical and then reduced back to tocopherol by vitamin C. The purpose of the study was to determine the effects of supplementation of Vitamins C and E (VCE) on diabetic rat kidney. Adult female Wistar rats were used in the study. The animals were divided into three groups. Group I: the control group; Group II: diabetic group, streptozotocin (40 mg kg-1) was administered group; Group III: diabetes + VCE group, received a diet containing a combination of ascorbic acid and dl-α-tocopheryl acetate per kg of feed. Rats were killed on 21st day and renal tissues were taken and fixed in 2.5% glutaraldehyde solution for electron microscopic examination. When compared with the control group, congestion of the glomerular capillaries, increased mesangial cells and distinct mesangium, shortened podocyte processes and disappearance of filtration slit pore of diabetic rat kidney were observed. In the group treated with VCE, glomerular changes were less distinct than the diabetic group. Lengths of the pedicles were similar to the control group. VCE reduced the changes in the glomerular structures due to diabetes.
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