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Öğe The effects of caffeic acid phenethyl ester on streptozotocin-induced diabetic liver injury(Comenius Univ, 2016) Taslidere, E.; Gul, M.; Elbe, H.; Cetin, A.; Vardi, N.; Ozyalin, F.; Turkoz, Y.The aim of the present study was to clarify the role of oxidative stress in streptozotocin induced liver injury and the possible protective effect of caffeic acid phenethyl ester (CAPE) using histological and biochemical parameters. 32 male Wistar rats were divided into 4 groups as follows: Group 1: Control animals, Group 2: Control animals given CAPE Group 3: STZ-induced diabetic animals (DM group), Group 4: STZ-induced diabetic rats given CAPE (DM+CAPE group). All the injections started on the same day of single-dose STZ injection and continued for 20 days. At the end of this period, livers were removed and processed for routine histological procedures. Biochemical parameters and morphological changes were examined. In DM group, blood glucose levels were significantly increased compared with the control group. Significant increases in tissue malondialdehyde (MDA) level and decreases in superoxide dismutase (SOD) and total glutathione (GSH) activities were detected in DM group. Administration of CAPE significantly reduced these values. STZ-induced histopathological alterations including inflammatory cell infiltration around portal triad, congestion, loss of glycogen in the hepatocytes. Additionally, degenerative cellular alterations, such as numerous vacuolizations including myelinic figure formation, pyknotic nuclei with peripheral localization of heterochromatin condensation and mitochondria! elongation were observed in cytoplasm of hepatocytes. CAPE significantly reduced these histopathological changes. Our results indicate that CAPE should be considered in the prevention of oxidative stress in diabetic liver (Tab. 3, Fig. 4, Ref. 47). Text in PDF www.elis.sk.Öğe Effects of central salusin-beta infusion on pituitary-thyroid axis in rats(Wiley, 2019) Tekin, S.; Demir, I; Ozyalin, F.; Sandal, S.[Abstract Not Available]Öğe Is there a new pathway relationship between melatonin and FEZ1 in experimental rat model of Alzheimer's disease?(Comenius Univ, 2019) Demir, M.; Yilmaz, U.; Colak, C.; Cigremis, Y.; Ozyalin, F.; Tekedereli, I; Sandal, S.Alzheimer's disease (AD) is a progressive neurodegenerative disease. This study was performed to determine the possible relationship between melatonin, which is known to play a role in the neuro-protective mechanism in AD, and fasciculation and elongation protein zeta 1 (FEZ1). Thirty male rats were included and separated into 3 groups (n = 10) as vehicle (artificial cerebrospinal fluid), streptozotocin (STZ) and STZ+melatonin (MLT). Two intracerebroventricular (icv) injections of 3 mg/kg STZ were made 48 hours apart. MLT injections were implemented for 14 days (ip; 10mg/kg/day). The Morris Water Maze (MWM) test was performed and rats were sacrificed to assess FEZ1 gene expression and protein levels from the hippocampus tissues and serum levels of noradrenaline (NA), dopamine and serotonin were determined from the blood samples. It was determined that the FEZ1/beta-actin protein ratio in the STZ group was significantly higher than that of the Vehicle group (p < 0.05) and in the MLT-administered group, the protein levels were decreased to the levels observed in the Vehicle group. Serum NA levels of STZ and STZ+MLT groups were found to be lower than those in the Vehicle group, while no difference was found regarding dopamine and serotonin levels. These findings show that reversal of increased FEZ1 levels in AD-induced rats with melatonin administration is the evidence of the effect of melatonin through FEZ1 in AD (Tab. 2, Fig. 5, Ref. 67).Öğe Protective effects of salusin-? and salusin-? on renal ischemia/reperfusion damage and their levels in ischemic acute renal failure(Taylor & Francis Ltd, 2017) Cakir, M.; Duzova, H.; Taslidere, A.; Orhan, G.; Ozyalin, F.Salusin-alpha and salusin-beta are expressed in many tissues including the central nervous system, vessels and kidneys; they have been shown to decrease endoplasmic reticulum stress during heart ischemia/ reperfusion (I/R) and to decrease apoptosis. We investigated the relation of salusin-alpha and salusin-beta levels to acute ischemic renal failure. We also investigated whether these peptides are protective against renal I/R damage. Fifty-three rats were divided into six groups: control, I/R, I/R + salusin alpha 1, I/R + salusin-alpha 10, I/R + salusin-beta 1 and I/R + salusin-beta 10. After removing the right kidney, the left kidney was subjected to ischemia for 1 h and reperfusion for 23 h. The treatment groups were injected subcutaneously at the beginning of ischemia with 1 or 10 mu g/kg salusin-a, and1 or 10 mu g/kg salusin-beta. Histopathology was assessed at the end of the experiment. Superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-PX) activity and malondialdehyde (MDA) levels were measured in the kidney tissue. Serum levels of blood urea nitrogen (BUN), creatinine (Cre), tumor necrosis factoralpha (TNF-alpha), interleukin-6 (IL-6) and interleukin-1 beta (IL-1 beta) alsoweremeasured. Levels of salusina and salusin-beta were measured in the serum and kidney tissues of the control and I/R groups. SOD, CAT and GSH-PX activities were decreased and the levels of MDA, TNF-a, IL-6, IL-1 beta, BUNand Cre were increased in the I/R group compared to controls. Severe glomerular and tubular damage was apparent in the I/R group compared to controls. The level of salusin-alpha was decreased in the serum and kidney tissue of the I/R group compared to controls, whereas the level of salusin-a was decreased in the serum and increased in the kidney tissue. Salusin-a and salusin-beta administration increased SOD and GSH-PX enzyme activation and decreased the levels of MDA, TNF-a, IL-6 and IL-1 beta compared to the I/R group. BUN and Cre levels were decreased in the I/R + salusin-alpha 1 group and the level of Cre was decreased in I/R + salusin-beta 10 group compared to the I/R group. We demonstrated a protective effect of salusin-alpha and salusin-beta against renal I/R damage. Changes in the levels of salusin-alpha and salusin-beta in the I/R group suggest that these peptides may be associated with acute renal failure.
