Publications (22) View all
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Article: Liver lipid peroxidation and antioxidant capacity in cerulein-induced acute pancreatitis.
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ABSTRACT: The aim of this study was to evaluate the role of oxidative damage in pancreatitis-induced hepatic injury. Thirty-five rats were divided into five groups (each of 7 rats): control, cerulein (100 microg/kg body weight), cerulein and pentoxifylline (12 mg/kg body weight), cerulein plus L-NAME (10 mg/kg body weight) and cerulein plus L-arginine (160 mg/kg body weight). The degree of hepatic cell degeneration differed significantly between groups. Mean malondialdehyde levels were 7.00 +/- 2.29, 20.89 +/- 10.13, 11.52 +/- 4.60, 18.69 +/- 8.56, and 8.58 +/- 3.68 nmol/mg protein for the control, cerulein, pentoxifylline, L-NAME, and L-arginine groups, respectively. Mean catalase activity was 3.20 +/- 0.83, 1.09 +/- 0.35, 2.05 +/- 0.91, 1.70 +/- 0.60, and 2.85 +/- 0.47 U/mg protein for the control, cerulein, pentoxifylline, L-NAME, and L-arginine groups, respectively, and mean glutathione peroxidase activity was 0.72 +/- 0.25, 0.33 +/- 0.09, 0.37 +/- 0.04, 0.34 +/- 0.07 and 0.42 +/- 0.1 U/mg protein for the control, cerulein, pentoxifylline, L-NAME, and L-arginine groups, respectively. Cerulein-induced liver damage was accompanied by a significant increase in tissue malondialdehyde levels (P < 0.05) and a significant decrease in catalase (P < 0.05) and GPx activities (P < 0.05). L-arginine and pentoxifylline, but not L-NAME, protected against this damage. Oxidative injury plays an important role not only in the pathogenesis of AP but also in pancreatitis-induced hepatic damage.Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas / Sociedade Brasileira de Biofisica ... [et al.] 09/2009; 42(9):776-82. · 1.08 Impact Factor -
Article: Melatonin and CAPE are able to prevent the liver from oxidative damage in rats: an ultrastructural and biochemical study.
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ABSTRACT: The liver continuously produces free radicals and reactive oxygen species (ROS) as part of metabolic process. These free radicals are neutralized by an elaborate antioxidant defense system consisting of enzymes and numerous nonenzymatic antioxidants like flavonoids. In this study, we have evaluated effects of melatonin and caffeic acid phenethyl ester (CAPE) to young and aged rat liver. Aging-related hepatic changes examined by light and electron microscopy and biochemical methods. Melatonin and CAPE decreased tissue malondialdehyde (MDA) levels in aged rats. Melatonin elevated tissue glutathione peroxidase (GSH-Px) activity and tGSH level, whereas CAPE elevated tissue catalase activity in aged rats. This study demonstrates that both melatonin and CAPE are beneficial in delaying age-related hepatocellular changes. Melatonin and CAPE supplementation in older ages may support liver to protect itself from various damaging agents including infectious agents and toxins.Ultrastructural Pathology 05/2012; 36(3):171-8. · 0.76 Impact Factor -
Article: Effect of resveratrol on tubular damage and interstitial fibrosis in kidneys of rats exposed to cigarette smoke.
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ABSTRACT: The aim of this study was to evaluate the effect of resveratrol on kidney tissue of rats exposed to cigarette smoke. Forty adult male Wistar Albino rats were divided into four groups. Animals in group 1 was the control group. For 6 weeks, group 2 was exposed to cigarette smoke; group 3 received daily intraperitoneal injections of resveratrol (10 mg/kg/d); and group 4 was exposed to both cigarette smoke and intraperitoneal resveratrol. All rats were sacrificed with cervical dislocation. The kidney tissues were obtained, fixed in Bouin's fixative and embeded in paraffin blocks. Samples were sectioned to 4-5 microns thickness, stained with hematoxylin/eosin (H/E), Masson's trichromic, periodic acid-schiff (PAS) and were examined by light microscopy for tubular injury and interstitial fibrosis. Results were compared by non-parametric tests. Hydropic degeneration, tubular atrophy, tubulo-interstitial fibrosis, interstitial cell infiltration, vacuolar degeneration and desquamation were prominent in group 2. In group 4, hydropic degeneration, epithelial cell vacuolization and desquamation was not observed, but occasional tubular atrophy and dilation were observed. Our study suggests that, some morphological alterations in the rat kidney, due to cigarette smoke may be prevented by resveratrol.Toxicology and Industrial Health 09/2009; 25(8):539-44. · 1.42 Impact Factor -
Article: Use of porcine small intestinal submucosa to reconstruct an ovarian defect.
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ABSTRACT: To investigate the feasibility of using porcine small intestinal submucosa (SIS) as a scaffold for repairing ovarian defects. Fourteen female New Zealand rabbits undergoing ovarian resection were randomly allocated to 2 equal groups. The unilateral ovarian defects were repaired with SIS in group 1 animals and without SIS in group 2 animals (control). The volumes of the ovaries were calculated and the severity of adhesions was assessed in 1 animal from each group each month. The ovaries were removed and examined under a microscope. The volumes of the SIS-grafted ovaries were larger than those of the operated ovaries of the control animals (P<0.05). The SIS-grafted ovaries had a lower adhesion score than the operated ovaries of the control group (P<0.001). SIS grafts showed hemorrhage and leukocyte infiltration until the 4th week after surgery, but the ovarian tissue appeared to be well organized from the 12th to the 16th week. At the 28th week, primordial follicles were scattered in the SIS graft. SIS graft could be used for repairing the ovary after surgery.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics 07/2009; 106(3):218-22. · 1.41 Impact Factor -
Article: Adrenomedullin reduces antioxidant defense system and enhances kidney tissue damage in cadmium and lead exposed rats.
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ABSTRACT: Adrenomedullin (AdM) is synthesized and secreted by a number of cells and tissue. AdM is a potent vasodilator but it is also considered a neuromodulator, an angiogenic factor, and a hormone regulator. AdM possess antiapoptotic, antioxidant, and antimicrobial properties. Heavy metals such as cadmium and lead are found widely in the environment and they have important biological functions. Lead (Pb) and cadmium (Cd) can accumulate in the lungs, liver, bone, and kidneys and cause serious organ damage. In the present study, we investigated the effect of AdM, Pb + AdM, and Cd + AdM treatments on superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) activities as well as the level of malondialdehyde (MDA) in the kidney. Heavy metal accumulation was determined in kidney with and without AdM infusion and kidney damage was evaluated by light and electron microscopy. Increased heavy metal accumulation was observed in the heavy metal and AdM treated groups. SOD, CAT, GSH-Px activities, and MDA levels were significantly different in the treatment groups when compared with the control group. Tubular degeneration, necrosis, cell swelling, mononuclear cell infiltration, and degenerated organelles were observed in the kidney following treatment. Therefore, AdM infusion has no beneficial and/or compensatory role in cadmium and lead toxicity in the kidney. We conclude that heavy metal accumulation in the kidney in conjunction with AdM infusion is cytotoxic despite the known beneficial effects of adrenomedullin.Environmental Toxicology 06/2009; 24(3):279-86. · 2.41 Impact Factor
