Person: KAYA, ÖZLEM TUĞÇE
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KAYA
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ÖZLEM TUĞÇE
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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 Demonstration of Doublecortin Protein, a Neurogenesis Marker, at the Electron Microscopic Level(AVES PRESS LTD, 2017) KAYA, ÖZLEM TUĞÇE; Kaya, Ozlem Tugce Cilingir; Moore, Cynthia; Meshul, Charles; Sirvanci, SerapObjective: Demonstration of newly born neurons in adult brains is an important issue in terms of elucidating neurogenesis. In our study, we aimed to develop an appropriate pre-embedding microwave labeling method for the newly born neuronal marker doublecortin (DCX) protein in the hippocampal dentate gyrus (DG) region. Methods: Brains were obtained from 10-week-old C57BJ/6J male mice by perfusion fixation. Vibratome sections from brain tissues were labeled with an anti-DCX antibody using a pre-embedding microwave method. Sections stained with 3.3'-diaminobenzidine (DAB) were prepared for electron microscopic (EM) analyses using a microwave. After embedding in Epon, thin sections were obtained, observed under an electron microscope, and photographed for morphological assessments. Results: DCX labeling performed using the pre-embedding microwave method was specifically demonstrated at both light and electron microscopic levels. DCX-positive cells were localized at the subgranular zone and granular layer. Electron microscopic observations showed that DCX immunoreactivity was positive at the axons, dendrites, and somata. Conclusion: We demonstrated that the existence of DCX can be determined using the pre-embedding microwave labeling as an immunoelectron method in the DG region. Our study provides a basis for further studies on neurogenesis aiming to show DCX-immunoreactive cells using the pre-embedding DAB labeling method at the electron microscopic level.Publication Open Access Tadalafil attenuates spinal cord injury induced oxidative organ damage in rats(2014-05-13) ŞENER, GÖKSELPublication Metadata only Effect of perinatal biotin deficiency on auditory pathway of the Wistar-Albino rats(TAYLOR & FRANCIS LTD, 2019) KAYA, ÖZLEM TUĞÇE; Yllmaz, Nevreste Didem Sonbay; Gur, Ozer Erdem; Ensari, Nuray; Bulut, Erdogan; Kaya, Ozlem Tugce; Sirvanci, Serap; Danisman, Betul; Derin, Narin; Gezgin, Bahri; Aygener, Nurdan; Yilmaz, Mustafa DenizAim: Severe biotin deficiency associated with biotinidase enzyme deficiency in newborns is seen as severe neurological problems and hearing loss. However, the effect on the infant of deficiencies in the maternal diet during pregnancy are not clear. Material and methods: The study included 16 female Wistar albino rats and 4 male Wistar albino rats, that were mated and then the females were separated into 4 groups. At 40 days after the birth, 3 pups were selected from each group, and these 12 pups were evaluated with DPOAE and ABR electrophysiologically and the cochlea was examined ultrastructurally with electron microscopy. Results: In the DPOAE evaluation, At 8000 and 11,000 Hz, the signal-noise ratios in the B-N and B-B groups were statistically significantly higher (p < .05). In ABR, lengthening of the latency periods was determined in all the waves at both 8 and 16 kHz in the B-B group. When the IPL periods were examined, lengthening in IPL 1-5 was statistically significant in the B-B group only at 8 kHz. Conclusions: Biotin can be said to have an effect on hearing pathways. However, specifically where on the hearing pathways that biotin is involved has not been clarified.Publication Metadata only The effect of Momordica charantia intake on the estrogen receptors ESR alpha/ESR beta gene levels and apoptosis on uterine tissue in ovariectomy rats(SPRINGER, 2015) YOLDEMİR, AHMET TEVFİK; Cevik, Ozge; Akpinar, Hikmet; Oba, Rabia; Cilingir, Ozlem Tugce; Ozdemir, Zarife Nigar; Cetinel, Sule; Yoldemir, TevfikEstrogen or combinational hormone therapy can protect to menopausal symptoms but exogenous estrogen therapy has some potential risks which in turns lead to the appearance of various diseases. In recent years plants with high phytoestrogen content are recommended as therapeutic agents for postmenopausal hormonal treatment. In this research, we investigated the effects of Momordica charantia (MC) on the estrogen production and E2 as well as anti-oxidative and anti-apoptotic role on the ovariectomy rat model. The rats were ovariectomized and fed on 2 g/kg of fruit extra of MC for 30 days by gavage. 17-beta estradiol (E2) and 8-OHdG levels in serum, markers of oxidative damage of ROS and ESR alpha, ESR beta and NF-kB gene levels were measured in uterus horn tissue. Caspase-3, caspase-9, TNF-alpha, IL-6, IL-10, Bcl-2 and Nf-kB proteins expression were assessed by western blotting. Structural changes in tissue were examined with H&E staining. MC administration also stimulated the E2 production and ESR alpha/ESR beta gene levels and the inhibited oxidative damage. Furthermore, MC treatment enhanced anti-apoptotic and anti-inflammatory process and tissue regeneration. Data herein support that MC directly regulates uterine estrogen response and may serve as a new phytoestrogenic substance for the treatment of post-menopausal symptoms.Publication Metadata only Ameliorative Effect of Chronic Moderate Exercise in Smoke Exposed or Nicotine Applied Rats From Acute Stress(OXFORD UNIV PRESS, 2015) YARAT, AYŞEN; Kuru, Pinar; Bilgin, Seyda; Mentese, Semih Tiber; Tazegul, Gokhan; Ozgur, Sevinc; Cilingir, Ozlem T.; Akakin, Dilek; Yarat, Aysen; Kasimay, OzgurIntroduction: Physical activity has been found to be related with many health benefits. Our aim was to investigate the effect of chronic moderate exercise from acute stress on nicotine and cigarette smoke exposed rats. Methods: Male Sprague Dawley rats (200-250 g, n = 48) were divided into 6 groups as non-exercised, exercised, smoke exposed, smoke exposed and exercised, nicotine applied, and nicotine applied and exercised. Nicotine bitartarate was applied intraperitoneally (0.1 mg/kg/day) for 5 weeks, and cigarette smoke was exposed in a ventilated chamber. After 1 week of nicotine application or smoke exposure, moderate exercise training protocol was applied to exercise groups. At the end of the experiments, acute stress induction was made to all groups by electric foot shock. Holeboard tests were performed before and after the experiments. Biochemical and histological analyses were performed in lung, liver, colon, stomach, and gastrocnemius tissues. Results: Malondialdehyde levels were increased in all tissues of smoke exposed group (p < .05-.01) except gastrocnemius tissue compared to non-exercised group and were decreased with exercise (p < .05-.001). Myeloperoxidase levels were increased in lung, liver and colon tissues of smoke exposed group (p < .05-.001) and liver and colon tissues of nicotine applied rats (p < .01-.001) and decrease with exercise in liver and colon tissues of both smoke exposed or nicotine applied groups (p < .05-.01). In all tissue samples, increased histological injury scores (p < .05-.001) decreased significantly with exercise (p < .01-.001). Conclusion: Biochemical parameters and histological scoring indicated increased tissue injury due to nicotine application and cigarette smoke exposure and exercise training ameliorated these effects in most of the tissues of acute stress induced rats.Publication Metadata only Ultrastructural GABA immunocytochemistry in the mossy fiber terminals of Wistar and genetic absence epileptic rats receiving amygdaloid kindling stimulations(ELSEVIER, 2011) AKAKIN, DİLEK; Akakin, Dilek; Sirvanci, Serap; Gurbanova, Ayten; Aker, Rezzan; Onat, Filiz; San, TangulThe existence of absence epilepsy and temporal lobe epilepsy in the same patient is not common in clinical practice. The reason why both types of seizures are rarely seen in the same patient is not well understood. Therefore, we aimed to investigate kindling in a well known model of human absence epilepsy, genetic absence epilepsy rats from Strasbourg (GAERS). In the present study, we analyzed whether the GABA content of GAERS that received kindling stimulations was altered in the hippocampal mossy fiber terminals compared to non-epileptic control (NEC) Wistar rats. For this purpose, we used an immunocytochemical technique at the ultrastructural level. Ultrathin sections were immunolabeled with anti-GABA antibody and transmission electron microscopy was used for the ultrastructural examination. The number of gold particles per nerve terminal was counted and the area of the nerve terminal was determined using NIH image analysis program. The GABA density was found to be higher in sham-operated GAERS than sham-operated Wistar rats. The density was increased in kindling Wistar group compared to sham-operated Wistar and kindling GAERS groups. No statistical difference was observed between sham-operated GAERS and kindling GAERS groups. The increase in GABA levels in stimulated Wistar rats may be a result of a protective mechanism. Furthermore, there may be strain differences between Wistar rats and GAERS and our findings addressing different epileptogenesis mechanisms in these strains might be a basis for future experimental studies. (C) 2010 Elsevier B.V. All rights reserved.Publication Metadata only Nasal septal turbinate: Cadaveric study(OCEAN SIDE PUBLICATIONS INC, 2014) AKAKIN, DİLEK; Sisman, A. Sezim; Acioglu, Engin; Yigit, Ozgur; Akakin, Dilek; Cilingir, Ozlem TugceBackground: Despite the importance of its location, the functional behavior of the nasal septal turbinate (NST) is still not completely understood. Basic histological knowledge is still lacking. The aim of this study was to describe the histological features of the NST and to compare its morphometric features to those of the adjacent nasal septum and the inferior and middle turbinates. Methods: The study included 50 fresh cadavers. Excisional biopsy specimens of the NST with adjacent posterior septum were collected. In addition, mucosal and submucosal biopsy specimens were taken of the inferior and middle turbinates. Morphometric analysis was performed on five different tissue types: glandular elements, connective tissue stroma, arterial structures, and capillary or venous sinusoids. Results: The mean proportion of venous sinusoids was statistically lower in the nasal septum and NST than in the inferior and middle turbinate. The mean proportion of glandular tissues was higher in the NST than in other regions of the nasal cavity. The mean proportion of arterial tissue was lower in the nasal septum and the NST. Significantly fewer capillary elements were found in the inferior and middle turbinates than in the nasal septum and NST. The mean proportion of connective tissues was lower in the NST than in other regions of the nasal cavity. Conclusion: The similar histopathological cell distribution in the middle and inferior turbinate supported a function as an erectile organ, but the findings for the NST pointed to different functional properties of this region.Publication Metadata only Effects of Tumescent Solution on Fat Survival(THIEME MEDICAL PUBL INC, 2017) ERCAN, FERİHA; Sirinoglu, Hakan; Yesiloglul, Nebil; Kaya, Ozlem Tugce; Ercan, Feriha; Filinte, Gaye TaylanAutologous fat transfer is a commonly used procedure in plastic surgery practice. The long-term survival rate of fat grafts is the most important issue for satisfactory results. The presented study includes the effects of different tumescent solutions on long-term fat graft survival. A total of 24 rats were divided into four groups: sham, lidocaine, adrenaline, and lidocaine + adrenaline groups. In all groups except the sham group, right inguinal fat pad was harvested 10 minutes after injecting 5 cc of the appropriate tumescent solution. The fat pad was trimmed and reimplanted to the interscapular area. After 3 months, fat pad was reharvested and sent for histopathologic evaluation. The harvested fat grafts were weighted in both surgical sessions. A significant difference was observed in comparison of fat grafts weights between the initial operation and the postoperative third month (p = 0.002). By intergroup comparisons, a significant difference was observed between sham and adrenaline groups (p = 0.002) and between sham and lidocaine + adrenaline groups (p = 0.007). No statistical difference was observed by the comparison of TUNNEL results (p = 0.663). The histopathologic evaluation of the specimens revealed similar results between groups. The injection of tumescent solutions containing only lidocaine before fat harvesting yields similar long-term fat graft survival rates in comparison to the conduction of surgical procedure without injecting any tumescent fluid. However, the injection of solutions containing adrenaline with or without lidocaine may decrease the long-term survival rates of fat autografts.Publication Open Access Effects of dapagliflozin in experimental sepsis model in rats(TURKISH ASSOC TRAUMA EMERGENCY SURGERY, 2018) OKUYAN, BETÜL; Kingir, Zehra Betul; Kumral, Zarife Nigar Ozdemir; Cam, Muhammet Emin; Cilingir, Ozlem Tugce; Sekerler, Turgut; Ercan, Feriha; Ozakpinar, Ozlem Bingol; Ozsavci, Derya; Sancar, Mesut; Okuyan, BetulBACKGROUND: The aim of this study was to evaluate the possible protective effects of dapagliflozin in an experimental sepsis model in rats. METHODS: Saline (1 mL/kg, p.o.) or dapagliflozin (10 mg/kg, p.o.) was administered to Sprague-Dawley rats for 5 days prior to the surgical procedures. Under anesthesia, sepsis was induced by cecal ligation puncture, while sham control groups underwent laparotomy only. Blood urea nitrogen, creatinine, and glucose levels were measured in serum samples and the levels of malondialdehyde (MDA), glutathione (GSH), myeloperoxidase (MPO), tumor necrosis factor alpha, interleukin 1 beta, caspase 8, and caspase 9 were determined in tissue samples (kidney, liver, and lung). Histological evaluation was also performed. RESULTS: The administration of dapagliflozin in a sepsis model reduced oxidative stress (MDA), increased antioxidant levels (GSH), and reduced inflammation (MPO) in the kidney (p<0.05). Dapagliflozin also decreased oxidative stress (MDA) in lung tissue and decreased inflammation (MPO) in lung and liver tissue (p<0.05). Caspase 8 and 9 levels in kidney, lung, and liver tissue were increased (p< 0.05) in the dapagliflozin group compared with the sepsis group. According to the histopathological results, sepsis was moderately improved in renal tissue and slightly attenuated in lung and liver tissue with the administration of dapagliflozin. CONCLUSION: Dapagliflozin had a preventive effect on sepsis-induced kidney damage, but the protective effect was mild in lung and liver tissue in the present study.