Person: AKGÜN ÖLMEZ, SEVCAN GÜL
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AKGÜN ÖLMEZ
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SEVCAN GÜL
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Publication Metadata only Comparison of inhaled and intraperitoneal formaldehyde toxicity in rats and the evaluation of the effects of melatonin(ELSEVIER IRELAND LTD, 2016) BECEREN, AYFER; Aydemir, S.; Akgun, S. G.; Ozkan, N.; Yuksel, M.; Beceren, A.; Erdogan, N.; Omurtag, G. Z.Publication Metadata only İmhası istenilen ürünler(2015-12-01) CÜCÜ, AYŞEN; BİTİŞ, LEYLA; RAYAMAN, ERKAN; ŞAHBAZ, SEVİNÇ; AKGÜN ÖLMEZ, SEVCAN GÜL; Cücü A., Bitiş L., Rayaman E., Şahbaz S., Akgün Ölmez S. G.Publication Open Access Evaluation of Genotoxicity Risk in Health Care Workers Exposed to Antineoplastic Drugs(MARMARA UNIV, INST HEALTH SCIENCES, 2019-06-30) BECEREN, AYFER; Oltulu, Cagatay; Yesil Devecioglu, Tugce; Akinci, Melek; Olmez, Sevcan Gul Akgun; Obeidin, Serra Vildan Akgul; Beceren, AyferObjective: DNA damage that can be caused by workplace exposure to antineoplastic drugs in health workers has been shown in many scientific studies. It is aimed to evaluate whether the risk of genotoxicity in health workers decreases after the regulations and measures taken by national and international health authorities in our work. Methods: For this purpose, DNA damage was assessed by using alkaline comet technique in lymphocytes isolated from blood samples of health workers (n=29) who were involved in preparing and/or administering antineoplastic agent at Trakya University Health Research and Application Center and compared with the control group (n=30). Also, those who prepare and/or administer antineoplastic agents; (n=16) and manual (n=13) preparations. Results: As a result of the evaluation, there was no statistically significant difference between health personnel and control group in preparing and / or administering antineoplastic agent (p>0,05, Mann-Whitney U) and there was no difference in the genotoxic risk between preparation forms. Furthermore, when the exposed control group was assessed for DNA damage as smokers and nonsmokers, there was no statistically significant difference in terms of DNA damage (p>0.05). Conclusion: At the center where our samples were taken, the resulting measures resulted in the control of the risk of genotoxicity due to occupational exposure to antineoplastic agents.Publication Metadata only The wound healing effects of Nerium oleander extract against burn-induced oxidative injury(ELSEVIER IRELAND LTD, 2016) BECEREN, AYFER; Akgun, S. G.; Aydemir, S.; Ozkan, N.; Beceren, A.; Sardas, S.Publication Open Access Adaptation of the Systematic Review Framework to the Assessment of Toxicological Test Methods: Challenges and Lessons Learned With the Zebrafish Embryotoxicity Test(OXFORD UNIV PRESS, 2019-09-01) AKGÜN ÖLMEZ, SEVCAN GÜL; Stephens, Martin L.; Akgun-Olmez, Sevcan Gul; Hoffmann, Sebastian; de Vries, Rob; Flick, Burkhard; Hartung, Thomas; Lalu, Manoj; Maertens, Alexandra; Witters, Hilda; Wright, Robert; Tsaioun, KatyaSystematic review methodology is a means of addressing specific questions through structured, consistent, and transparent examinations of the relevant scientific evidence. Thismethodology has been used to advantage in clinical medicine, and is being adapted for use in other disciplines. Although some applications to toxicology have been explored, especially for hazard identification, the present preparatory study is, to our knowledge, the first attempt to adapt it to the assessment of toxicological test methods. As our test case, we chose the zebrafish embryotoxicity test (ZET) for developmental toxicity and its mammalian counterpart, the standard mammalian prenatal development toxicity study, focusing the review on how well the ZET predicts the presence or absence of chemical-induced prenatal developmental toxicity observed in mammalian studies. An interdisciplinary team prepared a systematic review protocol and adjusted it throughout this piloting phase, where needed. The final protocol was registered and will guide the main study (systematic review), which will execute the protocol to comprehensively answer the review question. The goal of this preparatory study was to translate systematic review methodology to the assessment of toxicological test method performance. Consequently, it focused on the methodological issues encountered, whereas the main study will report substantive findings. These relate to numerous systematic review steps, but primarily to searching and selecting the evidence. Applying the lessons learned to these challenges can improve not only our main study, but may also be helpful to others seeking to use systematic review methodology to compare toxicological test methods. We conclude with a series of recommendations that, if adopted, would help improve the quality of the published literature, and make conducting systematic reviews of toxicological studies faster and easier over time.Publication Open Access Evaluation of the wound healing potential of Aloe vera-based extract of Nerium oleander(KARE PUBL, 2017) YÜKSEL, MERAL; Akgun, Sevcan Gul; Aydemir, Sezgin; Ozkan, Naziye; Yuksel, Meral; Sardas, SemraOBJECTIVE: Nerium oleander (Apocynaceae) and Aloe vera (Liliaceae) are among the widely used herbal remedies for treating skin diseases and possess numerous activities such as antibacterial, antiviral, antifungal, and antioxidant. The aim of this study was to investigate the possible wound healing effect of Aloev era-based extract of the N. oleander leaf (NAE-8 (R)) based on its antioxidant, anti-inflammatory, and DNA repair capacity along with histological changes and to compare them with the traditional silver sulfadiazine treatment (SSD). METHODS: Twenty-four Wistar albino rats were randomly grouped as follows: i) control, ii) burn alone (burn), iii) burn with topical NAE-8 (R) (burn+ NAE-8 (R)) treatment, and iv) burn with topical 1% silver sulfadiazine (burn+ SSD) treatment. All groups received their related topical application twice a day for 14 consecutive days. Upon completion of the experimental protocol, trunk blood and skin tissues were collected for measuring malondialdehyde (MDA), glutathione (GSH), myeloperoxidase (MPO), tumor necrosis factor alpha (TNF-a), interleukin-1 beta (IL-1 beta), % DNA in the tail (% DNAT) levels along with histological examinations. RESULTS: Thermal injury-induced alterations in MDA, GSH, MPO, TNF-a, IL-1 beta, and % DNAT levels were significantly reversed by NAE-8 (R) treatment. These ameliorative effects were also supported by histological findings. CONCLUSION: Findings of the present study suggest that NAE-8 (R) is a promising remedy for treating skin burn injury.Publication Open Access Effect of sub-chronic exposure to cigarette smoke, electronic cigarette and waterpipe on human lung epithelial barrier function(BMC, 2020-12) AKGÜN ÖLMEZ, SEVCAN GÜL; Ghosh, Baishakhi; Reyes-Caballero, Hermes; Akgun-Olmez, Sevcan Gul; Nishida, Kristine; Chandrala, Lakshmana; Smirnova, Lena; Biswal, Shyam; Sidhaye, Venkataramana K.BackgroundTaking into consideration a recent surge of a lung injury condition associated with electronic cigarette use, we devised an in vitro model of sub-chronic exposure of human bronchial epithelial cells (HBECs) in air-liquid interface, to determine deterioration of epithelial cell barrier from sub-chronic exposure to cigarette smoke (CS), e-cigarette aerosol (EC), and tobacco waterpipe exposures (TW).MethodsProducts analyzed include commercially available e-liquid, with 0% or 1.2% concentration of nicotine, tobacco blend (shisha), and reference-grade cigarette (3R4F). In one set of experiments, HBECs were exposed to EC (0 and 1.2%), CS or control air for 10days using 1 cigarette/day. In the second set of experiments, exposure of pseudostratified primary epithelial tissue to TW or control air exposure was performed 1-h/day, every other day, until 3 exposures were performed. After 16-18h of last exposure, we investigated barrier function/structural integrity of the epithelial monolayer with fluorescein isothiocyanate-dextran flux assay (FITC-Dextran), measurements of trans-electrical epithelial resistance (TEER), assessment of the percentage of moving cilia, cilia beat frequency (CBF), cell motion, and quantification of E-cadherin gene expression by reverse-transcription quantitative polymerase chain reaction (RT-qPCR).ResultsWhen compared to air control, CS increased fluorescence (FITC-Dextran assay) by 5.6 times, whereby CS and EC (1.2%) reduced TEER to 49 and 60% respectively. CS and EC (1.2%) exposure reduced CBF to 62 and 59%, and cilia moving to 47 and 52%, respectively, when compared to control air. CS and EC (1.2%) increased cell velocity compared to air control by 2.5 and 2.6 times, respectively. The expression of E-cadherin reduced to 39% of control air levels by CS exposure shows an insight into a plausible molecular mechanism. Altogether, EC (0%) and TW exposures resulted in more moderate decreases in epithelial integrity, while EC (1.2%) substantially decreased airway epithelial barrier function comparable with CS exposure.ConclusionsThe results support a toxic effect of sub-chronic exposure to EC (1.2%) as evident by disruption of the bronchial epithelial cell barrier integrity, whereas further research is needed to address the molecular mechanism of this observation as well as TW and EC (0%) toxicity in chronic exposures.Publication Metadata only Investigation of genotoxicity risk in healthcare workers that has occupational exposure to antineoplastic drugs(ELSEVIER IRELAND LTD, 2017) AKGÜN ÖLMEZ, SEVCAN GÜL; Oltulu, Cagatay; Akinci, Melek; Yesil, Tugce; Akgul, Vildan; Akgun, Sevcan; Motor, Deniz; Canbaz, Suat; Sardas, SemraPublication Open Access A Systematic Review to Compare Chemical Hazard Predictions of the Zebrafish Embryotoxicity Test With Mammalian Prenatal Developmental Toxicity(OXFORD UNIV PRESS, 2021-08-30) AKGÜN ÖLMEZ, SEVCAN GÜL; Hoffmann, Sebastian; Marigliani, Bianca; Akgun-Olmez, Sevcan Gul; Ireland, Danielle; Cruz, Rebecca; Busquet, Francois; Flick, Burkhard; Lalu, Manoj; Ghandakly, Elizabeth C.; de Vries, Rob B. M.; Witters, Hilda; Wright, Robert A.; Olmez, Metin; Willett, Catherine; Hartung, Thomas; Stephens, Martin L.; Tsaioun, KatyaOriginally developed to inform the acute toxicity of chemicals on fish, the zebrafish embryotoxicity test (ZET) has also been proposed for assessing the prenatal developmental toxicity of chemicals, potentially replacing mammalian studies. Although extensively evaluated in primary studies, a comprehensive review summarizing the available evidence for the ZET's capacity is lacking. Therefore, we conducted a systematic review of how well the presence or absence of exposure-related findings in the ZET predicts prenatal development toxicity in studies with rats and rabbits. A two-tiered systematic review of the developmental toxicity literature was performed, a review of the ZET literature was followed by one of the mammalian literature. Data were extracted using DistillerSR, and study validity was assessed with an amended SYRCLE's risk-of-bias tool. Extracted data were analyzed for each species and substance, which provided the basis for comparing the 2 test methods. Although limited by the number of 24 included chemicals, our results suggest that the ZET has potential to identify chemicals that are mammalian prenatal developmental toxicants, with a tendency for overprediction. Furthermore, our analysis confirmed the need for further standardization of the ZET. In addition, we identified contextual and methodological challenges in the application of systematic review approaches to toxicological questions. One key to overcoming these challenges is a transition to more comprehensive and transparent planning, conduct and reporting of toxicological studies. The first step toward bringing about this change is to create broad awareness in the toxicological community of the need for and benefits of more evidence-based approaches.