Browsing by Author "Fidan, Ceylan"

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The Activities of Gst Isozymes in Stomach Tissues of Female Obese Patients
(Walter de Gruyter Gmbh, 2020) Yilmaz, Can; Bulus, Hakan; Oguztuzun, Serpil; Cihan, Mehmethan; Fidan, Ceylan
Objectives: Obesity has become an important public health problem because of its increasing prevalence and relation with many diseases and mortality. Studies have shown its association with oxidative stress. In this study, the effect of obesity on total amount of thiol and some glutathione S-transferase (GST) isozymes were investigated which could serve as an important criteria in dose adjustment of some certain drugs in obese. Methods: The gastric tissues removed by gastrectomy operation from 29 morbid obese female patients were analysed for thiol levels and activities of total GST, GSTT1-1 and GSTM1-1. Patients were grouped according to age, presence of hypertension and/or diabetes, and family history. Results: The average total thiol was 131.22 (+/- 7.74) nmol/mg protein with no significant differences in between the groups. GSTT1 specific activities were about 20% higher in four groups: with ages over 35 years old, with hypertension, without diabetes and finally without family history, with respect to other groups. The differences between total GST and GSTM1 activity levels of experimental groups were not significant. Conclusions: This is the first study to compare activities of GST isozymes and total thiol content in the stomach tissues of obese female patients accompanying some common metabolic disorders, age and family history.
Ald Tekniğiyle Külçeleşme ve Sızmaya Karşı Dayanıklı Katı Destekli Metal Nanokatalizörlerinin Geliştirilmesi ve Formik Asitten Hidrojen Üretiminde Kullanılması
(2017) Caner, Nurdan; Fidan, Ceylan; Zahmakıran, Mehmet; Kıvrak, Hilal Demir; Yurderi, Mehmet
Bisphenol S Leads To Cytotoxicity-Induced Antioxidant Responses and Oxidative Stress in Isolated Rainbow Trout (Oncorhyncus Mykiss) Hepatocytes
(Springer, 2021) Kaptaner, Burak; Yilmaz, Can; Aykut, Handan; Dogan, Emine; Fidan, Ceylan; Bostanci, Muserref; Yildiz, Fatos
Background Bisphenol S (BPS) is a chemical compound that is utilized in the plastic industry as an alternative to bisphenol A (BPA). The toxic effects of BPS in fish is less known and limited. Therefore, in the present study, the influence of BPS on rainbow trout (Oncorhyncus mykiss) hepatocytes in vitro was investigated. Methods and results For this purpose the fish hepatocytes were isolated, and then the cultured cells were treated with increasing concentrations of BPS (0, 15.63, 31.25, 62.50, 125, 250, and 500 mu M) for 24 h. The cytotoxic impact of BPS was determined in the culture media using lactate dehydrogenase assay and then, the antioxidant defence indicators were assayed. The results showed that concentration-dependent increases were observed in the percentage of cytotoxicity. The superoxide dismutase activity was reduced, while the catalase and glutathione peroxidase activity increased with all of the BPS concentrations. The glutathione S-transferase (GST) activity significantly increased after a BPS concentration of 31.25 mu M or higher, while GST Theta 1-1 activity was decreased by the same concentrations of BPS. The reduced glutathione content significantly decreased with a BPS concentration of 31.25 mu M or higher, and the malondialdehyde content increased after BPS concentrations of 125, 250, and 500 mu M. Conclusions The findings determined herein suggested that BPS causes cytotoxicity in fish hepatocytes and can lead to oxidative stress, resulting hepatotoxic in fish. Thus, the utilization of BPS instead of BPA as safe alternative in industry should be re-evaluated in the future for environmental health.
Comparison of the Activities of Glutathione S-Transferase Isozymes and Total Thiol Content of Gastric Tissues Obtained From Obesity Patients by Gastrectomy Operation
(2018) Fidan, Ceylan; Yılmaz, Can
Obezite, prevalansındaki yükselme eğiliminden, birçok hastalık ve mortalite ile ilişkili olmasından dolayı pek çok ülkede önemli bir halk sağlığı sorunu haline gelmiştir. Bu çalışmada endojen savunma mekanizmasının önemli üyeleri olan glutatyon molekülü ve glutatyon S-transferaz enzimi üzerine obezite ve ilişkili hastalıklarının etkisi araştırıldı. 39 obez hastasından alınan mide dokusu örnekleri homojenize edildi. GSH düzeyleri analiz edildi. GST enzim aktivitesi ELISA Mikroplaka Okuyucu sistemde CDNB, pNBC, EPNP substratlarına karşı okuma yapılarak belirlendi. Hastalar cinsiyet, yaş, hipertansiyon olgusu, diyabet olgusu ve aile öyküsü parametreleri göz önünde bulundurularak gruplandırıldı. Vücut Kitle İndeksi-GSH-Toplam GST aktivitesi ilişkisinde, toplam GST aktivitesinin yüksek ölçüldüğü durumlarda, GSH miktarı nispeten düşük olarak tespit edildi. Yaş-GSH ve toplam GST ilişkisinde yaş artışı ile beraber GSH düzeyi ve toplam GST aktivitesinde artış gözlendi. Cinsiyete göre yapılan karşılaştırmada, kadın hastalarda, üç farklı substratla ölçülen tüm aktivite değerlerine ait ortalamaların, erkeklerin ortalamalarından yüksek olduğu tespit edildi. Mevcut çalışma Türk popülasyonundaki obez hastaların mide dokularında GST enzim aktivitelerinin ve toplam tiyol miktarının yaş, cinsiyet, hipertansiyon olgusu, diyabet olgusu ve aile öyküsü parametrelerine göre gruplandırılıp karşılaştırıldığı ilk çalışma oldu. Bu çalışma Ankara Keçiören Eğitim ve Araştırma Hastanesi Baştabipliği Klinik Araştırmalar Etik Kurulu'nun 2012-KAEK-15/(1678) 1800 sayılı onayıyla gerçekleşmiştir.
The Effects of Water Quality and Brewing Type on Total Antioxidant Capacity in Herbal Teas
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2021) Yilmaz, Can; Konus, Metin; Fidan, Ceylan; Ergin, Derya; Cetin, Dogan; Dilek, Zeynep; Elasan, Esma
The antioxidant capacity of the polyphenols is the basis of the potential health benefits of herbal tea consumption. In this study. the effects of infusion time. presence of tea packs and water quality on the extraction yield of polyphenolic compounds providing antioxidant activity of melissa, rosehip, fennel, camomile and white tea, which are commonly consumed in Turkey. were investigated. Antioxidant activities were determined by using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. The results of the study showed that the antioxidant activity of herbal teas brewed with distilled water was higher than that in tap water, and that antioxidant activity increased for these teas due to the increased infusion time. When tap water was used, it was determined that a higher antioxidant activity was obtained as a result of brewing for 3 minutes for rosehip and melissa tea and 10 minutes for white tea. The results also showed that packaged brewing for rosehip and fennel tea; and, unpackaged brewing for chamomile, melissa, and white tea resulted in higher antioxidant activity.
Synthesis and Biological Activity of New Indole Based Derivatives as Potent Anticancer, Antioxidant and Antimicrobial Agents
(Elsevier, 2022) Konus, Metin; Cetin, Dogan; Kizilkan, Nurhan Didem; Yilmaz, Can; Fidan, Ceylan; Algso, Muheb; Arslan, Sevki
Indoles have very critical roles to design new biologically active molecules in medicinal chemistry. They display higher biological activities or create new biological properties when compared to the other heteroaromatic compounds. In the present study, 1-ethyl-2-phenyl-3-(thiophen-2-yl)-1H-indole (3), 8-ethyl-8H-benzo[a]thieno[3,2-c]carbazole (4), 1-ethyl-2-phenyl-3-(5-(phenylethynyl)thiophen-2-yl)-1H-indole (6) and 1-ethyl-3-(furan-2-yl)-2-phenyl-1H-indole (7) are prepared via Pd-catalyzed cross-coupling reactions and iodocyclization reactions. It was determined that compound 3 and 7 were also seemed to be better drug candidates at the end of in silico evaluation. Furthermore, compound 7 provided the best antibacterial and antifungal activity against the test indicator strains. It showed a potent antifungal effect on Aspergillus niger ATCC 16404 (MIC: 1.17 mu g mL(-1); MFC: 2.7 mu g mL(-1)). In addition, while compounds 3, 6 and 7 showed significantly high molybdenum reducing activity compared to trolox, 7 exhibited almost the same antioxidant activity (EC50 = 7.1 mu M) compared to the trolox standard (EC50 = 5.07 mu M). After characterization, the cytotoxic activities of novel indoles were tested against different cancer cell lines and non-cancerous human cell line. Compound 3 and 7 had selective cytotoxic activity towards cancer cells. EC50 values of compound 3 were found to be 248.15 mu M for LnCap, 139.81 mu M for HepG2, and 164.72 mu M for the Caco-2 cell line. Similarly, The EC50 value of 7 was found as 38.725 mu M for LnCap, 70.02 mu M for HepG2, and 86.98 mu M for Caco-2, and 90.97 mu M for Hek293 cell line. Moreover, it was revealed that these two compounds showed strong apoptotic properties towards these cancer cell lines as described by image cytometry and real time PCR. Consequently, these results improved that our molecules 3 and 7 could be new candidates as anticancer agents and apoptosis inducers. (C) 2022 Elsevier B.V. All rights reserved.