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BECEREN, AYFER

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Eczacılık Fakültesi

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BECEREN

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AYFER

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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, Ayfer
Objective: 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.
Open Access
Kolorektal kanser tanısı konmuş olgularda ve birinci derece yakınlarında DNA hasarının araştırılması
(2011-01-01) BECEREN, AYFER; BECEREN A., OMURTAG G. Z., YEĞEN C., ŞARDAŞ S.
Amaç: Dünyanın pek çok ülkesinde yapılan araştırmalar kalıtımsal duyarlılık ve çevresel faktörlerin etkileri sonucu kolorektal kanserlerin oluştuğuna işaret etmektedir. Kolorektal kanser hastalarının birinci derece yakınlarında kansere yakalanma riskinin diğer bireylere oranla iki kat daha yüksek olduğu yapılan çalışmalar ile gösterilmiştir. Kolorektal kanserin moleküler ve biyolojik özellikleri hakkındaki bilgilerin hızla artması patogenezine ışık tutmaktadır. Artan kanser riskinin belirlenmesi için biyogöstergelerden sıklıkla yararlanılmaktadır. Bu çalışmanın amacı, genotoksisite çalışmalarında DNA hasarının gösterilmesinde oldukça başarılı bir biyogösterge olan comet tekniği ile kolorektal kanser hastaları ve birinci derece yakınlarının lenfositlerindeki muhtemel genotoksik etkilerin sağlıklı gönüllüler ile karşılaştırılmasıdır. Yöntemler: Henüz hiç tedavi görmemiş, yeni teşhis edilmiş kolorektal kanser hastalarından (n=26), birinci derece yakınlarından (n=26) ve kontrol grubundan (n=18) kan örnekleri toplandı. Comet tekniğinde her örnek için incelenen 50 hücrenin (slayt başına) her birinde kuyruktaki DNA yüzdesi oranlarının ortalaması “mean tail DNA %” (%DNAT) görüntüleme analiz sistemi kullanılarak hesaplandı. Yapılan anket değerlendirmelerinde sosyodemografik özellikler ve DNA hasarını etkileyebilecek faktörler göz önünde bulundurulmuştur. Bulgular: Kolorektal kanser hastaları ve birinci derece yakın bireylerin periferal kan lenfositlerinde comet tekniği uygulanması sonucunda elde edilen ortalama %DNAT değerleri (sırasıyla 10.45±1.50 ve 9.83±1.39) olarak saptanmış olup, kontrol grubu (8.59±0.76) ile karşılaştırıldığında istatistiksel olarak anlamlı bir farklılık tespit edilmiştir (sırasıyla p <0.001, p <0.01). Sonuç: Bu çalışmada elde edilen sonuçlar kolorektal kanser teşhisi konmuş hastalarda ve özellikle de birinci derece yakınlarında comet tekniğinin, DNA hasarını belirlemede bir biyogösterge olarak kullanılabileceğini göstermiştir
Open Access
Melatonin protects against acrylamideinduced oxidative tissue damage in rats
(2012-01-01) BECEREN, AYFER
Open Access
Genotoksisite testlerinin yeni ilaç geliştirme sürecindeki önemi
(2018-03-01) BECEREN, AYFER; ŞEN S., BECEREN A., AKSOY H.
In the preclinic investigation period at the beginning of the drug development process, it is an obligation to subject candidate drugs to genotoxicty investigations. Genotoxicty data of drugs that are developed with these tests are demanded as a part of the security evaluation process by regulatory authorities in various countries. The demand of these laboring and costly data by regulatory authorities of various countries in different standards prevents potential candidate drugs from being marketed, interrupts the drug development process and causes unnecessary utilization of experimental materials in researches. Therefore, nowadays, it is generally accepted that the researches aimed at achieving these data are implemented with standardized approaches in the guidelines of international harmonisation organizations such as ICH (International Council for Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use) and OECD (Organisation for Economic Cooperation and Development). In this review, it is aimed to provide current information about the various genotoxicity tests which are used commonly in the drug development process, in accordance with ICH, OECD guidelines and literature.
Open Access
Safety of herbal drugs
(2023-01-01) BECEREN, AYFER; BECEREN A.
Open Access
Evaluation of clinical pharmacist interventions on drug-related problems in the gastroenterology ward
(2022-01-01) SANCAR, MESUT; BECEREN, AYFER; CEYLAN C., SANCAR M., BECEREN A., Demir A., KUŞ C., Omurtag G. Z.
Integrating clinical pharmacists in a multidisciplinary patient care team improves the treatment process by identifying and resolving drug-related problems (DRPs). The aim of the study was to determine the effect of clinical pharmacist intervention for DRPs in the gastroenterology service. The first period of the study was conducted between 15.06.2018 and 15.02.2019. Eighty patients admitted to the gastroenterology ward, who used at least one medication, were included in \"the study group\". The clinical pharmacist participated in ward rounds and made interventions to solve identified DRPs. In the second period of the study, the control group consisted of 80 patients admitted to the same ward between 01.03.2019 and 06.06.2019. DRPs were determined only from the data obtained from the hospital system in the control group. DRPs were classified according to the European Pharmaceutical Care Network (PCNE V9.1). A total of 136 and 46 with an average of 1.7 and 0.57 DRPs per patient (p <= 0.01) were identified in the study and control groups, respectively. Of the DRPs in the study group, 59 were related to treatment effectiveness, while 61 were related to treatment safety. Likewise, 21 DRPs were related to treatment effectiveness in the control group, while 12 were related to treatment (p <= 0.01). 65% of the interventions were made at the physician level and 49% at the drug level. 97% (n=133) of the total interventions were accepted. The number of DRPs was significantly reduced in the control group within the time frame after the clinical pharmacist intervention period. In conclusion, clinical pharmacists\" importance in detecting and preventing DRPs in the gastroenterology ward has been demonstrated.
Open Access
Ginkgo biloba extract reduces naphthalene-induced oxidative damage in mice
(JOHN WILEY & SONS LTD, 2007-01) BECEREN, AYFER; Tozan, Ayfer; Sehirli, Ozer; Omurtag, Gulden Z.; Cetinel, Sule; Gedik, Nursal; Sener, Goksel
This investigation elucidated the role of free radicals in naphthalene-induced toxicity and protection by Ginkgo biloba extract (EGb). BALB-c mice of either sex were administered with naphthalene (100 mg/kg; i.p.) for 30 days, along with either saline or EGb (150 mg/kg, orally). At the end of the experiment, following decapitation, lung, liver and kidney tissue samples were taken for histological examination or determination of malondialdehyde (MDA), glutathione (GSH), myeloperoxidase (MPO) activity and collagen contents. In addition, proinflammatory cytokines (TNF-alpha and IL-beta) and total antioxidant capacity (AOC) were assayed in the plasma, while lactate dehydrogenase (LDH) activity was assayed in serum samples. The results revealed that naphthalene caused a significant decrease in GSH level, and significant increases in MDA level, MPO activity and collagen content of tissues. Similarly, plasma cytokines, as well as serum LDH activity, were elevated while AOC was decreased in the naphthalene group compared with the control group. On the other hand, EGb treatment reversed all these biochemical indices. The results demonstrate that EGb extract, by balancing the oxidant-antioxidant status and inhibiting the generation of proinflammatory cytokines and neutrophil infiltration, protects against naphthalene-induced oxidative organ injury. Copyright (c) 2006 John Wiley & Sons, Ltd.
Open Access
Determination of in vitro genotoxic effects of pine resin and Aronia melonacarpa on prostate and breast cancer cell lines by using comet assay technique
(2022-11-05) BECEREN, AYFER; BİNGÖL ÖZAKPINAR, ÖZLEM; Beceren A., Bingöl Özakpınar Ö.
The cancer burden continues to grow globally and places extraordinary physical, emotional and financial pressures on individuals, communities and health systems. Studies continue without slowing down to establish new targets and treatment strategies for cancer, which still remains an important problem in the clinic and does not have a definitive cure yet. Natural compounds obtained from different sources stand out as new therapeutic agents in cancer due to their more effective and selective properties and lower toxic effects. Thus, we aimed to clarify the possible anticancer effects of Aronia melonacarpa on human breast cancer cell line (MCF-7) and pine resinon prostate cancer cell line (PC-3).Our target plants, pine resin and Aronia melonacarpa were collected from different locations from Aegean and Blacksea region of Türkiye, respectively. The genotoxic effect of the methanol extracts was determined by alkaline comet assay. 100, 200 and 400 μg/ml extract concentrations, which have the high cytotoxic effect, were used. The examined groups were control negative, plant extract and positive control groups. Comparison of the anti-cancer and genotoxic effect of different concentrations on MCF-7 of Aronia melonacarpa and pine resin on PC-3 was evaluated by SPSS 20.0 program. Comet assay results showed that the both Aronia melonacarpa and pine resin extract exhibited genotoxic effects against MCF-7 and PC-3 cell lines in a dose-dependent manner by increasing the mean percentage of DNA damage after 24hrs of treatment (p<0.001).However, the observed toxicity of this two plant extract needs to be confirmed by additional studies. Based on our results, further examination of the potential anticancer properties of two plant species and the identification of the active ingredients of these extracts is warranted. This preliminary study is important for future studies and we anticipate that it will contribute to the development of a new drug in cancer treatment.
Open Access
Investigation of Antioxidants's Antimutagenic Effects by The Ames Test
(MARMARA UNIV, FAC PHARMACY, 2017-04-18) BECEREN, AYFER; Beceren, Ayfer; Sarikaya, Betul; Tatlipinar, Esref; Omurtag, Gulden Z.; Sardas, Semra
Nowadays, several test systems have been developed in order to observe the mutagenic effects of chemical agents which play crucial roles in human health. The Ames Test is one of these test systems. With the Ames Test, some bacterial mutants have been discovered to investigate the mutagenic effects of the chemicals. Various strains of Salmonella typhimurium are one of the groups of the bacterial mutants in question. The aim of this study is to investigate possible antimutagenic effect of Pelargonium sidoides which have an antioxidant effect towards carcinogenic substance called 2-aminofluorene by Ames/Salmonella/Microsome test kit in the absence and presence of metabolic activation. TA 98 and TA 100 strains were used in these experiments. TA 98 is designed for frame-shift mutagens and TA 100 is designed for base-pair mutagens. The antimutagenic activity was screened in two groups with or without S9 metabolic activation. The results were evaluated the mean average values and compared with positive and negative controls. In conclusion, it was shown that Pelargonium sidoides have antimutagenic effect towards TA 98 and TA 100 without S9 metabolic activation (p >= 0.05) but have no antimutagenic effect towards TA 98 and TA 100 with S9 metabolic activation (p <= 0.05).
Open Access
Polyphenolic composition and Antioxidant Effect of Aerial Parts and Roots Extracts from Scorzonera veratrifolia
(2021-08-17) DOĞAN, AHMET; Taşkin, Duygu; Geçi̇M, Mert; Doğan, Ahmet; Beceren, Ayfer