Person: ÖZKAN YENAL, NAZİYE
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ÖZKAN YENAL
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NAZİYE
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Publication Metadata only The antifibrotic drug halofuginone reduces ischemia/reperfusion-induced oxidative renal damage in rats(ELSEVIER SCI LTD, 2013) YEGEN, BERRAK; Cerit, Kivilcim Karadeniz; Karakoyun, Berna; Yuksel, Meral; Ozkan, Naziye; Cetinel, Sule; Dagli, E. Tolga; Yegen, Berrak C.; Tugtepe, HalilAim: The objective of the present study was to evaluate the protective effects of halofuginone against renal ischemia/reperfusion (I/R) injury. Materials and methods: Male Wistar albino rats were unilaterally nephrectomized and the left renal pedicles were occluded for 45 min to induce ischemia and then reperfused for 6 h (early) or for 72 h (late). The rats were treated intraperitoneally with either halofuginone (100 mu g/kg/day) or saline 30 min prior to ischemia and the dose was repeated in the late reperfusion groups. In the sham groups, rats underwent unilateral nephrectomy and were treated at similar time points. The animals were decapitated at either 6 h or 72 h of reperfusion and trunk blood and kidney samples were obtained. Results: I/R injury increased renal malondialdehyde levels, myeloperoxidase activity and reactive oxygen radical levels, and decreased the renal glutathione content. Halofuginone treatment was found to reduce oxidative I/R injury and improve renal function in the rat kidney, as evidenced by reduced generation of reactive oxygen species, depressed lipid peroxidation and myeloperoxidase activity, and increased glutathione levels. Conclusions: The present findings demonstrate the anti-inflammatory and antioxidant effects of halofuginone in renal I/R injury, supporting its potential use where renal I/R injury is inevitable. (C) 2012 Journal of Pediatric Urology Company. Published by Elsevier Ltd. All rights reserved.Publication Open Access The effects of resveratrol treatment on caveolin-3 expression and Na+/K+ ATPase activity in rats with isoproterenol-induced myocardial injury(KARE PUBL, 2020) YEGEN, BERRAK; Sehirli, Ahmet Ozer; Aykac, Asli; Tetik, Sermin; Yiginer, Omer; Cetinel, Sule; Ozkan, Naziye; Akkiprik, Mustafa; Kaya, Zehra; Yegen, Berrak Caglayan; Tezcan, Mehmet; Sener, GoekselOBJECTIVE: The present study aims to investigate the therapeutic effects of resveratrol (RES) on isoproterenol (ISO) induced myocardial injury rat model. METHODS: Catecholamine-induced heart damage was induced by ISO treatment for 30 days. The rats were divided into four groups as follows: the control group received saline, the ISO group received 5.0 mg/kg ISO, the RES group received 10 mg/kg RES, and the ISO-RES group received 10 mg/kg RES and 5 mg/kg ISO treatments for 30 days. Following echocardiographic measurements and body weight recorded, the rats were decapitated. Plasma and cardiac tissue samples obtained by decapitation were analyzed using biochemical, histopathological, molecular and immunohistochemical methods. RESULTS: In the ISO group, Na+/K+ ATPase activity and ATP content, GSH, and caveolin-3 levels were low. LDH, CK and lysosomal enzyme activities, MDA level, and MPO activity were found to be high. It was determined that GSH and MDA levels and MPO, Na+/K+ ATPase activity, ATP content caveolin-3 levels changes that arose from ISO treatment were suppressed by RES treatment. CONCLUSION: RES treatment has ameliorated all the functional and biochemical parameters. The results obtained in this study suggest that RES is a promising supplement against catecholamine exposure as it improves antioxidant defense mechanisms in the heart. In the light of above-mentioned data, RES can be assumed as a promising agent in ameliorating the oxidative injury of the myocardium.Publication Metadata only Obestatin improves ischemia/reperfusion-induced renal injury in rats via its antioxidant and anti-apoptotic effects: Role of the nitric oxide(ELSEVIER SCIENCE INC, 2014) YEGEN, BERRAK; Koc, Mehmet; Kumral, Zarife Nigar Ozdemir; Ozkan, Naziye; Memi, Gulsun; Kacar, Omer; Bilsel, Serpil; Cetinel, Sule; Yegen, Berrak C.Obestatin was shown to have anti-inflammatory effects in several inflammatory models. To elucidate the potential renoprotective effects of obestatin, renal I/R injury was induced in male Sprague Dawley rats by placing a clamp across left renal artery for 60 min following a right nephrectomy. Clamp was released and the rats were injected with either saline or obestatin (10, 30, 100 mu g/kg). In some experiments, obestatin (10 mu g/kg) was administered with L-NAME (10 mg/kg) or L-Nil (0.36 mg/kg). Following a 24-h reperfusion, the rats were decapitated to measure serum creatinine and nitrite/nitrate levels, renal malondialdehyde (MDA), glutathione (GSH) levels and myeloperoxidase (MPO) activity and to assess cortical necrosis and apoptosis scores. Obestatin treatment reduced I/R-induced increase in creatinine levels, renal MPO activity and renal MDA levels, while renal GSH levels were significantly increased by obestatin. Histological analysis revealed that severe I/R injury and high apoptosis score in the kidney samples of saline-treated rats were significantly reduced and the cortical/medullary injury was ameliorated by obestatin. Expression of eNOS, which was increased by I/R injury, was further increased by obestatin, while serum NO levels were significantly decreased. iNOS inhibitor L-Nil reduced oxidative renal damage and improved the functional and histopathological parameters. I/R-induced elevation in eNOS expression, which was further increased by obestatin, was depressed by L-NAME and L-Nil treatments. The present data demonstrate that obestatin ameliorates renal I/R-injury by its possible anti-oxidative, anti-inflammatory and anti-apoptotic properties, which appear to involve the suppression of neutrophil accumulation and modulation of NO metabolism. (C) 2014 Elsevier Inc. All rights reserved.Publication Open Access Protective effects of St. John's wort in the hepatic ischemia/reperfusion injury in rats(AVES, 2018-09-28) VELİOĞLU ÖĞÜNÇ, AYLİZ; Atalay, Suleyman; Soylu, Belkis; Aykac, Asli; Ogunc, Ayliz Velioglu; Cetinel, Sule; Ozkan, Naziye; Erzik, Can; Sehirli, Ahmet OzerObjectives: The purpose of this study was to investigate possible protective effects of St. John's wort in the hepatic ischemia/reperfusion injury. Material and Methods: The hepatic artery, portal vein, and bile duct were all clamped for 45 minutes to induce ischemia in rats, and after that reperfusion for 1 hour. SJW was administrated orally, once a day for 3 days before ischemia/reperfusion. The aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and interleukin levels were measured in the serum samples. Luminol chemiluminescence, lucigenin luminol chemiluminescence levels; myeloperoxidase. The sodium-potassium ATPase (Na+/K+ ATPase) activity was determined in the liver tissue, and caspase-3 and caspase-9 activity with the bcl-2/bax ratio were measured by the western blot analysis. Results: The St. John's wort administration recovered the aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and IL-1 beta levels serum parameters meaningfully, while ischemia/reperfusion caused an increase in luminol chemiluminescence, lucigenin luminol chemiluminescence, myeloperoxidase, caspase-3, and caspase-9 activity and led to a decrease in the B-cell lymphoma-2/bcl-2-associated X protein (bcl-2/bax) ratio and the Na+/K+ ATPase activity. Conclusion: The obtained results indicate protective effects of St. John's wort on the ischemia/reperfusion injury through various mechanisms, and we are able to suggest that St. John's wort can clinically create a new therapeutic principle.Publication Metadata only Histomorphological Changes of Apelin Treatment in Renal Tissue in Doxorubicin-induced Nephrotic Syndrome Model(AVES PRESS LTD, 2016) KOÇ, MEHMET; Ozkan, Naziye; Sehirli, Ahmet Ozer; Koc, Mehmet; Cetinel, SuleObjective: Nephrotic syndrome (NS) may result in renal failure. Apelin (AP), a vasoactive peptide, demonstrates its effect by binding to the AP receptor. AP, present in the endothelial and vascular smooth muscle cells of glomerular arterioles, affects the pre- and post-microvascularization by regulating renal hemodynamics. This study aimed to determine the histomorphological changes of AP treatment in a doxorubicin (DOX)-induced NS model. Methods: Male Sprague Dawley rats were used. Rats were randomly divided into four groups (n=6): control [physiological saline (PS) solution intraperitoneal (i.p.)]; AP+PS (PS and 50 mcg/kg/day AP-13 i.p.); NS [10 mg/kg DOX i.p.] and NS+AP (NSAP; 10 mg/kg DOX+50 mcg/kg/day AP-13 i.p.). Renal tissues were collected on the 22nd day for light microscopic investigations. Results: Light microscopic investigations showed that the NS group revealed adhesions between the tuft and Bowman's capsule, mesangial matrix accumulation in the glomeruli, and tubular damage with dilatation and cast accumulation. In the NSAP group, minimal regression in the glomerular and tubular damage was observed. Conclusion: The histomorphological changes of AP treatment in a DOX-induced NS model demonstrated a limited therapeutic effect on glomerular and tubular damage in renal tissues.Publication Metadata only Protective effects of spironolactone against hepatic ischemia/reperfusion injury in rats(TURKISH SURGICAL ASSOC, 2019) VELİOĞLU ÖĞÜNÇ, AYLİZ; Atalay, Suleyman; Soylu, Belkis; Aykac, Asli; Ogunc, Ayliz Velioglu; Cetinel, Sule; Ozkan, Naziye; Erzik, Can; Sehirli, Ahmet OzerObjective: In the present study, it was aimed to study the antioxidant effects of spironolactone (SPL) to determine its possible protective effects in hepatic ischemia reperfusion injury. Material and Methods: Hepatic artery, portal vein, and bile duct of Wistar albino rats were clamped for 45 minutes under anesthesia to form an ischemia period. Then reperfusion was allowed and the rats were decapitated 60 minutes later. SPL (20 mg/kg, p.o.) or SF was orally administered for 30 minutes before ischemia. Rats in the control arm underwent sham surgery and were administered isotonic saline. Liver function was studied by measuring aspartate aminotransferase (AST), alanine aminotransferase (ALT), tumor necrosis factor-alpha (TNF-alpha), and interleukin 1beta (IL-1 beta) levels. Malondialdehyde (MDA), glutathione (GSH), luminol, and lucigenin levels, myeloperoxidase (MPO) and Na+-K+- ATPase enzyme activities were analyzed to study tissue injury under light microscope. Results: While IR increased AST, ALT, TNF-alpha, and IL-1 beta levels and MDA, luminol, and lusigenin levels and MPO activities, it caused a decrease in GSH levels and Na+K+-ATPase activity. Spironolactone administration significantly improved these values. Conclusion: Protective effects of SPL against ischemia/reperfusion injury via various mechanisms suggest that this agent may become a novel treatment agent in clinical practice.