Person: ERCAN, FERİHA
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ERCAN
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FERİHA
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Publication Metadata only Melatonin protects against epirubicin-induced cardiotoxicity(ELSEVIER GMBH, 2007) ERCAN, FERİHA; Guven, Aysel; Yavuz, Ozlem; Cam, Meryem; Ercan, Feriha; Bukan, Neslihan; Comunoglu, CemWe investigated the cytoprotective effect of melatonin in epirubicin-induced cardiotoxicity using four experimental groups of mate Wistar rats: untreated control rats, epirubicin-treated rats, epirubicin+melatonin-treated rats, and melatonin-treated rats. We examined the histopathological. and biochemical, effects of melatonin on the epirubicin-induced changes and measured the Levels of the lipid peroxication end-product (malondialdehyde, MDA), an indicator of nitric oxide (NO) synthesis (nitrite/nitrate production), and reduced glutathione (GSH) in the heart. We also studied the extracellular matrix components (fibronectin, laminin) in the heart. Vacuole formation, mitochondrial. deformation and degeneration, and disordered myofibrillary structures were detected ultrastructurally in the epirubicin-treated group. The degeneration was reduced in the heart tissues of the epirubicin+melatonin group. Epirubicin increased the nitrite/nitrate production, but did not change the MDA and GSH levels significantly. Melatonin treatment Lowered the nitrite/nitrate concentrations, while increasing the GSH levels, which exceeded the Levels in epirubicin+melatonin-treated rats. We conclude that the epirubicin increased the nitrozative stress, not the oxidative stress, in heart tissue, and the cardioprotective effect of melatonin was partially attributed to the suppression of epirubicin-induced nitrozative stress. These results suggest that melatonin partially protects against epirubicin-induced cardiotoxicity. (C) 2006 Elsevier GmbH. All rights reserved.Publication Metadata only Early pulmonary involvement in Niemann-Pick type B disease: Lung lavage is not useful(WILEY, 2005) KARADAĞ, BÜLENT TANER; Uyan, ZS; Karadag, B; Ersu, R; Kiyan, G; Kotiloglu, E; Sirvanci, S; Ercan, F; Dagli, T; Karakoc, F; Dagli, ENiemann-Pick disease (NPD) is a rare, autosomal-recessively inherited lipid storage disease which is characterized by intracellular deposition of sphingomyelin in various body tissues. The disease is heterogeneous and classified into six groups. Pulmonary parenchymal involvement may be a feature of several subtypes of NPD, including type B. Progressive pulmonary involvement in NPD type B is a major cause of morbidity and mortality It is usually diagnosed at older ages. Only a few cases with early pulmonary involvement have been reported. In this report, a patient with NPD type B, hospitalized with the diagnosis of pneumonia at age 3 months, is presented. Following treatment for pneumonia, she continued to have persistent respiratory symptoms and became oxygen-dependent. High-resolution computed tomography of the chest revealed diffuse interstitial changes. During follow-up, the patient developed hepatosplenomegaly. Lung, liver, and bone marrow biopsies showed characteristic findings for NPD. Biochemical studies also confirmed the diagnosis, and the sphingomyelinase enzyme level of the patient was low. Unilateral lung lavage was performed in order to decrease lipid storage as a treatment modality However, there was no clinical or radiological improvement. The patient died at age 15 months due to progressive respiratory failure. Pulmonary involvement is a rare entity in early childhood in patients with NPD type B, but should be considered in the differential diagnosis of persistent interstitial lung disease. It may cause progressive respiratory failure, but the treatment options remain limited.Publication Metadata only Repair of critical size defects using bioactive glass seeded with adipose-derived mesenchymal stem cells(2016-05-25) AKDENİZ DOĞAN, ZEYNEP DENİZ; SAÇAK, BÜLENT; YILMAZ, BETÜL; ERCAN, FERİHA; AKDENİZ DOĞAN Z. D., SAÇAK B., YILMAZ B., ERCAN F., ÇELEBİLER Ö. B.Publication Metadata only Apocynin attenuates testicular ischemia-reperfusion injury in rats(W B SAUNDERS CO-ELSEVIER INC, 2015) ŞİMŞEK, FERRUH; Sener, T. Emre; Yuksel, Meral; Ozyilmaz-Yay, Nagehan; Ercan, Feriha; Akbal, Cem; Simsek, Ferruh; Sener, GokselObjective: This study was designed to examine the possible protective effect of apocynin, a NADPH oxidase inhibitor, against torsion/detorsion (T/D) induced ischemia/reperfusion (I/R) injury in testis. Methods: Male Wistar albino rats were divided into sham-operated control, and either vehicle, apocynin 20 mg/kg-or apocynin 50 mg/kg-treated T/D groups. In order to induce I/R injury, left testis was rotated 720 degrees clockwise for 4 hours (torsion) and then allowed reperfusion (detorsion) for 4 hours. Left orchiectomy was done for the measurement of tissue malondialdehyde (MDA), glutathione (GSH) levels, myeloperoxidase (MPO) activity, and luminol, lucigenin, nitric oxide (NO) and peroxynitrite chemiluminescences (CL). Testicular morphology was examined by light microscopy. Results: I/R caused significant increases in tissue luminol, lucigenin, nitric oxide and peroxynitrite CL demonstrating increased reactive oxygen and nitrogen metabolites. As a result of increased oxidative stress tissue MPO activity, MDA levels were increased and antioxidant GSH was decreased. On the other hand, apocynin treatment reversed all these biochemical indices, as well as histopathological alterations that were induced by I/R. According to data, although lower dose of apocynin tended to reverse the biochemical parameters, high dose of apocynin provides better protection since values were closer to the control levels. Conclusion: Findings of the present study suggest that NADPH oxidase inhibitor apocynin by inhibiting free radical generation and increasing antioxidant defense exerts protective effects on testicular tissues against I/R. The protection with apocynin was more pronounced with high dose. (C) 2015 Elsevier Inc. All rights reserved.Publication Metadata only Repair of critical size defects using bioactive glass seeded with adipose-derived mesenchymal stem cells(WILEY, 2017) YILMAZ, BETÜL; Sacak, Bulent; Certel, Furkan; Akdeniz, Zeynep D.; Karademir, Betul; Ercan, Feriha; Ozkan, Naziye; Akpinar, Ihsan Nuri; Celebiler, OzhanBioactive glass has been demonstrated as a biocompatible bone substitute. However bone healing process can be prolonged due to late resorption of the material. Adipose derived stem cells (ASC) have osteogenic differentiation potential and hence can be a cell source for bone regeneration. The aim of this study was to test whether combination of bioactive glass with ASCs would enhance bone regeneration. Following creation of critical sized defects on the calvaria of 32 Wistar rats, the animals were randomly divided into four groups: Group C (control): Defects were left untreated; Group G: Defects were covered with autologous bone graft; Group BG: Defects were filled with bioactive glass; Group BG/ASC: Defects were filled with bioactive glass seeded with ASCs. The defect size was significantly greater in Group compared to all other groups. Bone density was significantly lower in Group C compared to Group G and Group BG/ASC. Bone regeneration score of Group C was significantly lower than other groups. Group BG/ASC demonstrated lamellar bone and havers canal formation. The results of this study demonstrated that bioactive glass implanted with ASC is a biocompatible construct stimulating radiologically and histologically evident bone regeneration similar to autologous bone grafting. (C) 2016 Wiley Periodicals, Inc.Publication Metadata only Melatonin supports alendronate in preserving bone matrix and prevents gastric inflammation in ovariectomized rats(WILEY, 2019) YEGEN, BERRAK; Gurler, Esra Bihter; Cilingir-Kaya, Ozlem Tugce; Eyuboglu, Irem Peker; Ercan, Feriha; Akkiprik, Mustafa; Reiter, Russell J.; Yegen, Berrak C.The anti-catabolic bisphosphonate alendronate is considered as the first-line medical treatment in post-menopausal osteoporosis; but several side effects, including gastric mucosal injury, are associated with its use. The aim was to elucidate whether combined treatment with melatonin plus alendronate would be more advantageous in the maintenance of bone and the prevention of gastric side effects. Under anaesthesia, female Sprague-Dawley rats underwent bilateral ovariectomy (OVX), while control group had sham surgery. Four weeks after the surgery, OVX rats were treated with saline, melatonin (25 mu g/mL/d), alendronate (70 mu g/kg/wk), melatonin + alendronate, melatonin + melatonin receptor antagonist (luzindole, 10 mu g/kg/d) or alendronate + melatonin + luzindole for 8 weeks. Rats were euthanized at the end of 12th week. Runx2 expression, apoptotic cells, and trabecular thickness were evaluated in tibiae, while gastric tissues were analysed for oxidative injury parameters. In all OVX groups, Runx2 expression was depressed. Saline-treated OVX group presented an extreme decrease in calcified area in opposition to melatonin- or alendronate-treated groups, while the bones in alendronate + melatonin-treated group were similar to those of the sham-operated group. Concomitant with the improvements examined histologically in bone tissues, quantitative TUNEL (+) cells were similarly lower in alendronate- or melatonin-treated groups. Oxidative gastric damage was increased in saline- or alendronate-treated groups, which were depressed in the presence of melatonin. Although melatonin and alendronate exerted similar supportive effects on the maintenance of bone mass, melatonin may have a more advantageous impact by protecting against OVX-induced gastric injury, which was aggravated by alendronate use. Highlights Our results demonstrate that alendronate and melatonin had similar supportive effects on the maintenance of bone mass, while melatonin prevented the gastric side effects of alendronate, making this combination an advisable therapeutic approach in the treatment of menopausal osteoporosis.Publication Metadata only Time-dependent morphological alterations of cold-stored small bowel in Euro-Collins and Ringer's lactate solutions(ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2004) ERCAN, FERİHA; Oner, S; Ercan, F; Arbak, SSmall bowel is one of the organs that can in principle be transplanted. Optimum preservation of the organ is essential for the success of transplantation. The aim of the present study is the investigation of time-related morphological changes of rat small, bowel. during preservation in hypothermic Euro-Collins (EC) and Ringer's lactate (RL) solution using light microscopy and transmission electron microscopy to evaluate the integrity of intercellular complexes of mucosal. epithelium, one of the tissues of the intestine that is most susceptible to ischemia. Small. bowels were perfused with either EC, RL solution or physiological saline solution and were placed in the different preservation solutions at 4degreesC for 0, 3, 6 and 12 h. The results of our study suggest that both preservation solutions are suitable for short-term preservation of the small bowel although RL solution is more effective than EC solution. However, we conclude that further improvement of preservation solutions and/or techniques are needed to perform long-term preservation. (C) 2004 Elsevier GmbH. All rights reserved.Publication Metadata only Erdosteine treatment attenuates oxidative stress and fibrosis in experimental biliary obstruction(SPRINGER, 2007) ERCAN, FERİHA; Sener, Goeksel; Sehirli, A. Ozer; Toklu, Hale Z.; Yuksel, Meral; Ercan, Feriha; Gedik, NursalOxidative stress, in particular lipid peroxidation, induces collagen synthesis and causes fibrosis. The aim of this study was to assess the antioxidant and antifibrotic effects of erdosteine on liver fibrosis induced by biliary obstruction in rats. Liver fibrosis was induced in Wistar albino rats by bile duct ligation (BDL). Erdosteine (10 mg/kg, orally) or saline was administered for 28 days. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT) and lactate dehydrogenase (LDH) levels were determined to assess liver functions and tissue damage, respectively. Pro-inflammatory cytokines, TNF-alpha, IL-1 beta and IL-6 and antioxidant capacity (AOC) were assayed in plasma samples. Liver tissues were taken for determination of malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity and collagen content. Production of reactive oxidants was monitored by chemiluminescence assay. Serum AST, ALT, LDH, and plasma cytokines were elevated in the BDL group as compared to controls and were significantly decreased by erdosteine treatment. Hepatic GSH level and plasma AOC, depressed by BDL, were elevated back to control level with erdosteine treatment. Furthermore, hepatic luminol and lucigenin chemiluminescence (CL), MDA level, MPO activity and collagen content in BDL group increased dramatically compared to control and reduced by erdosteine treatment. Since erdosteine administration alleviated the BDL-induced oxidative injury of the liver and improved the hepatic functions, it seems likely that erdosteine with its antioxidant and antifibrotic properties, may be of potential therapeutic value in protecting the liver fibrosis and oxidative injury due to biliary obstruction.Publication Metadata only Deneysel sepsis modelinde akut kardiyopulmoner ve serebral hasarda nöropeptit W'nin etkisi(2019-12-13) ATICI, ALİ EMRE; PEKER EYÜBOĞLU, İREM; YEGEN, BERRAK; AKKİPRİK, MUSTAFA; ERCAN, FERİHA; ATICI A. E., ARABACI TAMER S., levent h. n., PEKER EYÜBOĞLU İ., ERCAN F., AKKİPRİK M., YEGEN B.Giriş ve Amaç: Ciddi enfeksiyonların neden olduğu sepsis ve beraberinde görülen çoklu organ yetmezliği, yüksek morbidite ve mortalite oranıyla en önemli klinik sendromlardan biridir. Yakın zamanda tanımlanan ve nöroendokrin düzenlemelerde işlev gördüğü gösterilen nöropeptit W (NPW)’nin, deneysel sepsis modeli oluşturularak akciğer, kalp ve beyin dokularında indüklenen oksidatif hasarda olası tedavi edici etkilerini araştırmayı amaçladık. Yöntemler: Ketamin anestezisi altında, Sprague-Dawley erkek sıçanlarda sham-operasyon (n=8) yapıldı veya çekal ligasyon ve perforasyon ile sepsis oluşturuldu (n=64). Post-operatif ciltaltına 3 doz (hemen sonra, 12. ve 24. saatlerde) serum fizyolojik (SF) veya TNF-alfa inhibitörü + antibiyotik (1 mg/kg etanersept + 100 mg/kg seftriakson) veya NPW (0,1; 0,3; 1, 3 ve 10 g/kg) uygulanırken, sham-opere gruba SF enjeksiyonları yapıldı. Yirmibeşinci saatte alınan kan örneklerinde C-reaktif protein (CRP), kortikosteron ve IL-6 düzeyleri ile çıkarılan akciğer, kalp ve beyin dokularında antioksidan glutatyon, lipit peroksidasyonunu gösteren malondialdehit ile nükleer faktör kappa-B (NF- B) mRNA ekspresyon düzeyleri ölçüldü. Hematoksilen-eozin ile histopatolojik değerlendirmeler yapıldı. Verilerin analizinde ANOVA ve Student’ın t-testleri kullanıldı. Bulgular: Etanersept+antibiyotik veya NPW (1-10 g/kg) tedavili sepsis gruplarında IL6, kortikosteron ve CRP düzeyleri SF-tedavili sepsis grubuna göre düşük bulundu (p<0,05-0,001). SFsepsis grubunda beyinde ve akciğerde malondialdehit düzeylerinin arttığı (p<0,01) ve glutatyonun düştüğü (p<0,01) gözlendi. Etanersept+antibiyotik tedavisi veya NPW beyindeki bu değişiklikleri engelledi (p<0,05-0,001). Buna karşın, akciğerde sepsisle artan malondialdehit ve azalan glutatyon düzeylerine antibiyotik+etanersept etkili olmazken, NPW (0,1-0,3 g/kg) akciğerde malondialdehit düzeyini düşürdü (p<0,05-0,01). Kalp dokusunda ölçülen malondialdehit ve glutatyon düzeyleri ile tüm dokularda ölçülen NF- B ekspresyonları açısından gruplar arasında anlamlı fark bulunmadı. SF-tedavili sepsis grubunda gözlenen dejenere nöron sayısında artış, akciğerde şiddetli kanama, alveoler yapıda bozulma ve nötrofil infiltrasyonu ile kardiyomiyositlerdeki konjesyon ve orta derecede hasar gibi değişikliklerin etanersept+antibiyotik ve NPW (10 g/kg) ile hafiflediği ve histolojik yapıların neredeyse normale döndüğü izlendi. Sonuç: Sepsisin ilk 24 saatinde uygulanan NPW, doza bağımlı olarak akciğer ve beyinde oksidatif hasara karşı koruyucu etki göstermektedir.Publication Open Access Ghrelin Treatment Improves Lipid Metabolism and Hepatic Degeneration in Ovariectomized Rats(GAZI UNIV, FAC MED, 2020-01-01) YEGEN, BERRAK; Gurler, Esra Bihter; Ozbeyli, Dilek; Kaya, Ozlem Tugce Cilingir; Ercan, Feriha; Yegen, Berrak C.Objective: Metabolic disorders occurring in post-menopausal period increase the risk for development of fatty liver disease in women. Aim of the study was to evaluate possible effects of ghrelin on metabolic biomarkers and hepatic morphology in ovariectomized (OVT) rats. Methods:Under ketamine-chlorpromazine anesthesia (100 mg/kg, 0.75 mg/kg), Sprague-Dawley rats (n=12) underwent bilateral OVT, while control group had sham-surgery (n=6). Four weeks after surgery, half of OVT rats were treated intraperitonally with ghrelin (1 mg/kg/hafta) for 4 weeks, while others were not treated. Rats were euthanized by cardiac puncture at the end of 8th weeks, and serum levels of glucose, insulin, aspartate aminotransferase (AST), high-density lipoprotein (HDL), low-density lipoprotein (LDL), very low-density lipoprotein (VLDL), triglycerides, estradiol and progesterone were measured by an automated analyzer. Results: Increased body weights in OVT rats (p<0.001) recorded at the end of 2 months was not changed with ghrelin. Serum estradiol and progesterone levels were reduced (p<0.05) verifying altered gonadal hormone status, but insulin and glucose levels were not changed. Reduced HDL and increased LDL levels (p<0.0.5) were evident in non-treated OVX rats, while ghrelin treatment depressed LDL levels (p<0.0.5), but did not change HDL levels. However, ghrelin in OVT rats depressed triglycerides, VLDL and AST levels significantly (p<0.05). Moderate sinusoidal congestion, activated Kupffer cells and hepatocytes with ballooning degeneration was observed in non-treated OVT rats, while significant improvements were present in livers of ghrelin-treated rats. Conclusion: In conclusion, mild dyslipidemia and hepatic degeneration in early post-menopausal period appear to be attenuated by ghrelin treatment, and require further investigation.