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 Nesfatin-1 treatment preserves antioxidant status and attenuates renal fibrosis in rats with unilateral ureteral obstruction(2022-06-01) ÇETİNEL, ŞULE; YEGEN, BERRAK; KAYA, ÖZLEM TUĞÇE; ÖZBEYLİ, DİLEK; Tezcan N., Özdemir-Kumral Z. N., Yenal N. Ö., Çilingir-Kaya Ö. T., Virlan A. T., Özbeyli D., Çetinel Ş., Yeğen B., Koç M.Background Nesfatin-1 (NES-1), an anorexigenic peptide, was reported to have anti-inflammatory and anti-apoptotic actions in several inflammation models. Methods To elucidate potential renoprotective effects of NES-1, unilateral ureteral obstruction (UUO) was induced in male Sprague Dawley rats by ligating left ureters. The rats were injected intraperitoneally with either saline (SL) or NES-1 (10 mu g/kg/day) for 7 or 14 days (n = 8 in each group). On the 7th or 14th day, obstructed kidneys were removed for the isolation of leucocytes for flow-cytometric analysis and the assessments of biochemical and histopathological changes. Results Opposite to glutathione levels, renal myeloperoxidase activity in the SL-treated UUO group was significantly increased compared with the sham-operated group, while NES-1 treatment abolished the elevation. The percentages of CD8+/CD4+ T-lymphocytes infiltrating the obstructed kidneys were increased in the SL-treated groups but treatment with NES-1 did not prevent lymphocyte infiltration. Elevated tumour necrosis factor-alpha (TNF-alpha) levels in SL-treated UUO group were decreased with NES-1. Although total degeneration scores were similarly increased in all UUO groups, tubular dilatation scores were significantly increased in UUO groups and lowered by NES-1 only in the 7-day treated group. Elevated interstitial fibrosis scores in the SL-treated groups were decreased in both 7- and 14-day NES-1 treated groups, while alpha-smooth muscle actin (alpha-SMA) and apoptosis scores were depressed in both NES-1 treated groups. Conclusion The present data demonstrate that UUO-induced renal fibrosis is ameliorated by NES-1, which appears to involve the inhibition of neutrophil infiltration and thereby amelioration of oxidative stress and inflammation. These data suggest that NES-1 may have a regulatory role in protecting the kidneys against obstruction-induced renal injury.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 Metadata only Primer siliyer diskinezi tanısında transmisyon elektron mikroskopi(Türkiye Klinikleri, 2022-01-01) KAYA, ÖZLEM TUĞÇE; ŞİRVANCI, SERAP; ŞİRVANCI S., KAYA Ö. T.Primer siliyer diskinezi (PSD), siliya fonksiyon bozukluğunun neden olduğu, çoğunlukla otozomal resesif geçişli, klinik ve genetik olarak heterojen bir hastalıktır. PSD klinik fenotipi değişkendir. Üst ve alt solunum sistemi, üreme organları, kalp ve siliyaların bulunduğu diğer sistemleri tutar. Zamanında doğan PSD'li bebeklerin yaklaşık %80'i, doğum sonrası 24 saat içinde solunum sıkıntısı kliniği gösterir ve oksijen desteği gerektirir. Sonraki dönemde tekrarlayan pnömoni veya bronşit yaygın görülür. Kronik, efüzyonlu tekrarlayan orta kulak iltihabı, özellikle yaşamın ilk yılında, PSD'li çocukların en az %80'ini etkiler. Hastaların yaklaşık %80'inde yıl boyu devam eden burun tıkanıklığı ve kronik sinüzit vardır. Situs inversus totalis daha sık olmak üzere bir dizi organ lateralite kusuru görülür. Erkeklerde infertilite, kadınlarda ektopik gebelik sıktır. Bazı durumlarda, PSD'nin polikistik böbrek, hidrosefali, polispleni gibi nadir ve olağandışı bozukluklarla ilişkili olduğu gösterilmiştir. Son zamanlarda genetik çalışmaların hızlanmasıyla yapılan çalışmalar, farklı genlerdeki mutasyonların değişken fenotiplere yol açtığını göstermektedir. Bununla ilgili vaka serileri mevcuttur.Publication Metadata only Oral histoloji(Quintessence Publishing Co, Inc., 2023-12-01) KAYA, ÖZLEM TUĞÇE; Kaya Ö. T. (Editör), Gürler E. B. (Editör), Aydın M. Ş. (Editör)Publication Metadata only Ultrastructural investigation of synaptic alterations in the rat hippocampus after irradiation and hyperthermia(TAYLOR & FRANCIS INC, 2020) ERCAN, FERİHA; Erkanli Senturk, Gozde; Cilingir-Kaya, Ozlem Tugce; Sirvanci, Serap; Isler, Cihan; Kemerdere, Rahsan; Ulu, Mustafa Onur; Umay, Cenk; Onat, Filiz; Ozkara, Cigdem; Uzan, Mustafa; Ercan, FerihaThis study aimed to investigate ultrastructural synaptic alterations in rat hippocampus after in utero exposure to irradiation (IR) and postnatal exposure to hyperthermia (HT). There were four groups in each of the time points (3(rd) and 6(th) months). IR group: Pregnant rats were exposed to radiation on the 17(th) gestational day. HT group: Hyperthermia was applied to the rat pups on the 10th day after their birth. IR+HT group: Both IR and HT were applied at the same time periods. Control group: No IR or HT was applied. Rat pups were sacrificed after 3 and 6 months. Thin sections from the dentate gyrus (DG) and the CA3 of hippocampus were evaluated for synapse numbers by electron microscopy. Synapses were counted, and statistical analysis was performed. Abnormalities in myelin sheath, mossy terminals and neuropil were observed in the CA3 and DG of all groups. The synapses in the CA3 region were significantly increased in the IR-3(rd) month, IR-6(th) month, and IR+HT-3(rd) month groups vs control group. Synapses were significantly increased in the DG of HT-3(rd) month group. A trend for an increase in synapse numbers was seen in the CA3 and DG. Increased number of synapses in the rat hippocampus may be due to mossy fiber sprouting, possibly caused by in utero irradiation and/or postnatal hyperthermia.Publication Metadata only Effect of Tacrolimus on Peripheral Nerve Regeneration in Allograft Transplantation: A Light and Electron Microscopic Study(2021) KAYA, ÖZLEM TUĞÇE; Cilingir-Kaya, Ozlem Tugce; Sumer, Onur; Sirvanci, Serap; Gurler, Esra Bihter; Akcal, Arzu; Karsidag, SemraOBJECTIVES: Peripheral nerve injuries are common in Europe; however, the treatment techniques may lead to disabilities. This study aimed to evaluate the effect of tacrolimus use on the capacity of the epineural sheath graft to improve its regeneration quality in rat sciatic nerves as a treatment option for nerve injuries. MATERIALS AND METHODS: In the experimental process, 30 male Sprague Dawley were used as recipients and 10 Wistar rats were used as donors. Under anesthesia, all rats were operated on to resect the sciatic nerve. The nerve tissue of Wistar rats was used as allograft. In the autograft group, the resected nerve was reversed and sutured, resulting in an epineural sheath graft. For the allograft groups, rats were randomly divided into 2 groups as the tacrolimus-treated group and the nontreated group after allograft transplant. Tacrolimus was administered intramuscularly at 0.1 mg/kg daily for 12 weeks. After the treatment period, rats were killed and evaluated histomorphologically with light and electron microscopy. RESULTS: Histological examination showed no remarkable differences between different regions of the sciatic nerves (distal, middle, and proximal). The axonal density was decreased in the allograft groups compared with the autograft group (P < .001). Results showed that the number of mast cells was increased in the allograft group without tacrolimus treatment (P < .05). Similarly, there was a mild increase in mast cell count in the tacrolimus-treated allograft group. CONCLUSIONS: Our results showed that tacrolimus use in rats with implanted epineural nerve sheath supported recovery in terms of morphological and physiological regeneration of the nerve.Publication 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.
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