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Öğe 99mTc labeled plumbagin: estrogen receptor dependent examination against breast cancer cells and comparison with PLGA encapsulated form(Springer Netherlands, 2016) Yurt Kilcar A.; Tekin V.; Biber Muftuler F.Z.; Medine E.I.Plant origin products having anticancer properties come into prominence due to widespread of cancer. Plumbagin has various biological activities like anticancer activity. Estrogen receptor (ER) specificity of plumbagin (PL) and radiolabeled PL investigated by in vitro studies on ER+ and ER- adenocarcinoma cells. Additionally, PLGA encapsulation was carried out to reduce toxicity of plumbagin and encapsulation effect was investigated. Plumbagin radiolabeled with 100 % in yields and had ER specificity. Furthermore, PLGA encapsulation effected positively on properties of plumbagin; reduced toxicity, increased stability and ER specificity. A promising agent for the diagnosis of ER+ breast cancer is suggested. © 2015, Akadémiai Kiadó, Budapest, Hungary.Öğe Examination of the Association between 3,4-Divanillyltetrahydrofuran Lignan (Urtica dioica Origin) and Prostate Cancer Cells by 131I Radiolabeling(Mary Ann Liebert Inc., 2021) Tekin V.; Guldu O.K.; Medine E.I.; Muftuler F.Z.B.Background: Prostate cancer is the most common type of cancer for men in many countries. One of the various prostate cancer therapy methods is hormone therapy, and explaining the association between androgen hormones and prostate cancer is a critical role for successful prostate cancer treatment. Materials and Methods: In the current study, the behavior of 3,4-divanillyltetrahydrofuran (DTH) was examined against prostate cancer cells, which have androgen sensitivity differences [LNCaP (+), PC3 (-)]. For this aim, DTH was obtained by extraction of Urtica dioica roots. The molecular structure of isolated compound was confirmed as DTH by liquid chromatography-mass spectrometry and nuclear magnetic resonance spectroscopy analyses. To evaluate the association of androgen sensitivity, DTH was radiolabeled with 131I, and cell uptake assay was performed by using 131I-radiolabeled DTH. Also, cytotoxicity (WST-1) assay of DTH was performed against LNCaP and PC3 cells to determinate the toxic effects of DTH on different androgen mechanisms. Results: The results of assays on cells have shown that DTH lignan behaves different like being more toxic to LNCaP cells than PC3 cells, depending on androgen sensitivity. Conclusion: The results may contribute both the research topics of phytolignan prostate cancer and androgen-sensitive prostate cancer. © 2021, Mary Ann Liebert, Inc., publishers.Öğe Hyaluronic acid-modified [19F]FDG-conjugated magnetite nanoparticles: in vitro bioaffinities and HPLC analyses in organs(Springer Netherlands, 2018) Yasakci V.; Tekin V.; Guldu O.K.; Evren V.; Unak P.In this study, we designed and synthesized [19F]FDG-(2-deoxy-2-[fluorine-19]fluoro-d-glucose) conjugated iron oxide magnetic nanoparticles ([19F]FDG-MNPs) for hybrid imaging and hyperthermia treatment. MNPs were synthesized, silica coated, and fabricated with TEOS (tetraethyl orthosilicate). They were then covered with hyaluronic acid (HA) to enhance their bioavailability. The modified MNPs were conjugated with [19F]FDG and optically labeled with ICG (indocyanine green). The in vitro bioaffinities were surveyed in MCF7 and PC3 cell lines. In vivo bioaffinies were determined using Sprague–Dawley rats. © 2018, Akadémiai Kiadó, Budapest, Hungary.Öğe In vitro determination of wound healing potential of axonge(HMP Communications, 2017) Bilgi A.; Muftuler F.Z.B.; Akman L.; Medine E.I.; Bilgi P.T.; Guldu O.K.; Gokulu S.G.; Tekin V.; Terek M.C.Background: Research on treatment alternatives that improve wound healing is an ever-evolving area in medicine, and a wound healing agent that carries minimal pain, discomfort, and scarring for patients with burn wounds, venous and decubitis ulcers, traumatic wounds, and many others is needed. The phases of wound healing include homeostasis, inflammation, migration, proliferation, and maturation. Adeps suillus (axonge) is known as a therapeutic agent for skin diseases and mainly consists of triglycerides. Objective: In the current study, the proliferation effect of axonge was determined on human normal epidermal keratinocyte (HaCaT) cells and human normal foreskin fibroblast cell line (BJ) cells. Materials and Methods: Experimental steps included preparation of HaCaT and BJ cell lines, axonge's stable tetrazolium salt-based proliferation assay, and evaluation of the wound healing effect of axonge on HaCaT and BJ cells. Results: Axonge concentrations of 3.12 µg/mL, 6.25 µg/mL, 12.5 µg/mL, 25 µg/mL, and 50 µg/mL showed no cytotoxic effect on both HaCaT and BJ cells for 24, 48, and 72 hours. Considering the wound area of HaCaT cells, after 6 hours the wound healing effect of the axonge group reached almost 70% and then stopped. According to the results of the study on BJ cells, after 6 hours axonge wound closure was found to be 50% while the control group was only 10%. Conclusion: On the basis of this study, the authors determined that axonge might have potential for use in wound healing. © 2017 HMP Communications. All rights reserved.Öğe Negative Pressure Wound Therapy for Patients With Complex Abdominal Wounds(2017) Bilgi A.; Zumrut Biber Muftuler F.; Akman L.; Ilker Medine E.; Tonbaklar Bilgi P.; Kozgus Guldu O.; Goksun Gokulu S.; Tekin V.; Cosan Terek M.BACKGROUND: Research on treatment alternatives that improve wound healing is an ever-evolving area in medicine, and a wound healing agent that carries minimal pain, discomfort, and scarring for patients with burn wounds, venous and decubitis ulcers, traumatic wounds, and many others is needed. The phases of wound healing include homeostasis, inflammation, migration, proliferation, and maturation. Adeps suillus (axonge) is known as a therapeutic agent for skin diseases and mainly consists of triglycerides.OBJECTIVE: In the current study, the proliferation effect of axonge was determined on human normal epidermal keratinocyte (HaCaT) cells and human normal foreskin fibroblast cell line (BJ) cells.MATERIALS AND METHODS: Experimental steps included preparation of HaCaT and BJ cell lines, axonge's stable tetrazolium salt-based proliferation assay, and evaluation of the wound healing effect of axonge on HaCaT and BJ cells.RESULTS: Axonge concentrations of 3.12 µg/mL, 6.25 µg/mL, 12.5 µg/mL, 25 µg/mL, and 50 µg/mL showed no cytotoxic effect on both HaCaT and BJ cells for 24, 48, and 72 hours. Considering the wound area of HaCaT cells, after 6 hours the wound healing effect of the axonge group reached almost 70% and then stopped. According to the results of the study on BJ cells, after 6 hours axonge wound closure was found to be 50% while the control group was only 10%.CONCLUSION: On the basis of this study, the authors determined that axonge might have potential for use in wound healing.Öğe A novel radiolabeled graft polymer: Investigation of the radiopharmaceutical potential using Albino Wistar rats(Elsevier Ltd, 2019) Avcıbaşı U.; Ateş B.; Ünak P.; Gümüşer F.G.; Gülcemal S.; Ol K.K.; Akgöl S.; Tekin V.Fe3O4 magnetic graft-Lys-poly(HEMA) was synthesized, labeled with 99mTc for the first time and its radiopharmaceutical potential was investigated using animal models in this study. Quality control procedures were carried out using thin layer radiochromatography. The labeling yield of radiolabeled polymer was found to be about 100%. Then, stability and lipophilicity were determined. The lipophilicity of 99mTc labeled Fe3O4 graft-Lys-poly(HEMA) was found to be 3.77. The serum stability experiments demonstrated that approximately 100% of radiolabeled polymer existed as an intact complex in the rat serum within 240 min. Biodistribution of radiolabeled magnetic graft-Lys-poly(HEMA) was performed on female Albino Wistar rats by scintigraphy and biodistribution studies. High uptake was seen in the stomach, the pancreas, brain, ovarian, intestines and the breast. © 2019 Elsevier LtdÖğe Radioiodination of pimonidazole as a novel theranostic hypoxia probe(Bentham Science Publishers, 2021) Inci I.D.; Tekin V.; Kilcar A.Y.; Guldu O.K.; Medine E.I.; Karatay K.B.; Muftuler F.Z.B.Background: Tumors are defined as abnormal tissue masses, and one of the most important factors leading to the growth of these abnormal tissue masses is Vascular Endothelial Growth Factor, which stimulates angiogenesis by releasing cells under hypoxic conditions. Hypoxia has a vital role in cancer therapy, thus it is important to monitor hypoxia. The hypoxia marker Pimonidazole (PIM) is a candidate biomarker of cancer aggressiveness. Objective: The study aimed to perform radioiodination of PIM with Iodine-131 (131I) to join a theranostic approach. For this purpose, PIM was derived as PIM-TOS to be able to be radioiodinated. Methods: PIM was derived via a tosylation reaction. Derivatization product (PIM-TOS) was radioiodinated by using iodogen method and was analyzed by High-Performance Liquid Chromatography and Liquid chromatography-mass spectrometry. Thin layer radiochromatography was utilized for its quality control studies. Results: PIM was derived successfully after the tosylation reaction. The radioiodination yield of PIM-TOS was over 85%. Conclusion: In the current study, radioiodination potential of PIM with131I, as a potential theranostic hypoxia agent was investigated. Further experimental studies should be performed for developing a novel hypoxia probe including theranostics approaches. © 2021 Bentham Science Publishers.Öğe Radiosynthesis and biodistribution of 99mTc-trimethoprim: A novel radiolabeled antibiotic for bacterial infection imaging using experimental animals [99mTc-Trimethoprim’in radyosentezi ve biyodağılımı: Deney hayvanları kullanılarak bakteriyel enfeksiyon görüntüleme için yeni bir radyoişaretli antibiyotik](Veteriner Fakultesi Dergisi, 2018) Demiroğlu H.; Topal G.; Parlak Y.; Gümüşer F.G.; Türköz E.U.; Tekin V.; Ateş B.; Ünak P.; Avcibaşi U.In the present article, we focused on the radiolabeling and evaluation of 99mTc–TMH complex as a potential candidate for infection imaging in vivo. For this; Trimethoprim (TMH) used to treat bacterial infections was investigated to label with99mTc. Labeling was performed using thin (II) chloride as a reducing agent at room temperature for 1 h and radiochemical analysis involved thin layer radiochromatography (TLRC) and high pressure liquid radiochromatograpy (HPLRC) methods. The stability of labeled antibiotic was checked in the presence of rat blood serum at 37.C up to 180 min. The maximum radiolabeling yield was found to be 96±2% and remained constant at more than 85±1% even in rat serum for 180 min after radiolabeling. Static image of 99mTc-TMH in male rats demonstrated that important radiation signals are present in the infected site at first glance in 30 min. After 30 min the uptake of the 99mTc-TMH as ID/g% in the infected muscle (INM) and normal muscle (NM) of the rats were 7.5±1.5% and 5.00±1.2%, respectively. In the INM/NM ratio a desirable behavior was observed as the values for the INM/ NM increased up to 10.6. 99mTc-TMH prepared with high yield is able to localize well in the bacterially infected muscle of the rats. As a result,99mTc-TMH may be developed as a radiopharmaceutical agent to distinguish infection from inflammation by nuclear imaging. © 2018, Veteriner Fakultesi Dergisi. All rights reserved.Öğe Radiosynthesis and biodistribution of 99mTc-trimethoprim: A novel radiolabeled antibiotic for bacterial infection imaging using experimental animals [99mTc-Trimethoprim’in radyosentezi ve biyodağılımı: Deney hayvanları kullanılarak bakteriyel enfeksiyon görüntüleme için yeni bir radyoişaretli antibiyotik](Veteriner Fakultesi Dergisi, 2018) Demiroğlu H.; Topal G.; Parlak Y.; Gümüşer F.G.; Türköz E.U.; Tekin V.; Avcibaşi U.In the present article, we focused on the radiolabeling and evaluation of 99mTc–TMH complex as a potential candidate for infection imaging in vivo. For this; Trimethoprim (TMH) used to treat bacterial infections was investigated to label with99mTc. Labeling was performed using thin (II) chloride as a reducing agent at room temperature for 1 h and radiochemical analysis involved thin layer radiochromatography (TLRC) and high pressure liquid radiochromatograpy (HPLRC) methods. The stability of labeled antibiotic was checked in the presence of rat blood serum at 37.C up to 180 min. The maximum radiolabeling yield was found to be 96±2% and remained constant at more than 85±1% even in rat serum for 180 min after radiolabeling. Static image of 99mTc-TMH in male rats demonstrated that important radiation signals are present in the infected site at first glance in 30 min. After 30 min the uptake of the 99mTc-TMH as ID/g% in the infected muscle (INM) and normal muscle (NM) of the rats were 7.5±1.5% and 5.00±1.2%, respectively. In the INM/NM ratio a desirable behavior was observed as the values for the INM/ NM increased up to 10.6. 99mTc-TMH prepared with high yield is able to localize well in the bacterially infected muscle of the rats. As a result,99mTc-TMH may be developed as a radiopharmaceutical agent to distinguish infection from inflammation by nuclear imaging. © 2018, Veteriner Fakultesi Dergisi. All rights reserved.Öğe Synthesis of radioiodinated thymoquinone glucuronide conjugated magnetic nanoparticle (125I-TQG-Fe3 O4) and its cytotoxicity and in vitro affinity(İstanbul Medipol University, 2018) İnce İ.; Biber Müftüler Z.; Medine E.İ.; Güldü Ö.K.; Tekin V.; Aktar S.; Göker E.; Ünak P.The aim of the current study is to develop solid, semisolid or liquid form of radionuclide labeled thymoquinone glucuronide conjugated magnetite nanoparticles those targets to the tumor for diagnosis and therapy of cancer. For this purpose, thymoquinone (TQ), a molecule present in the seeds of Nigella (Nigella sativa) used to enhance the affinity of the drug to the tumor cells. TQ was isolated from its microsomes and an enzymatic method applied to synthesize beta glucuronic acid derivatized thymoquinone glucuronide (TQG). TQG attached magnetic nanoparticles (TQG-Fe3 O4). TQG- Fe3 O4 were radiolabeled with 125I and (125I-TQG- Fe3 O4) its cytotoxic effect and in vitro affinity was investigated. The IC50 values of TQG- Fe3 O4 were found 27.31, 18.68, 11.88 (µg/mL) respectively 24, 48 and 72 hours against A549 cell line by WST-8 test as a colorimetric way. Incorporation ratios of TQG- Fe3 O4 with A549 cells is the highest levels. It is seen that TQG-Fe3O4 could inhibit the apoptosis on A549 cells but, there is no apoptotic effect of the samples on BEAS-2B cells. Size distribution, cellular uptake and toxicity characteristics of TQG- Fe3 O4 in this study maintains a useful targeted delivery system in lung cancer diagnosis and therapy. © 2018, İstanbul Medipol University. All rights reserved.Öğe Synthesis, characterization and biodistribution of 99mTc-Bioquin-HMPAO (99mTc-BH) as a novel brain imaging agent(Kluwer Academic Publishers, 2014) Yurt Kilcar A.; Biber Muftuler F.Z.; Enginar H.; Tekin V.; Medine E.I.; Unak P.Recently, the development of novel brain imaging agents has aroused much interest thanks to limited number of brain cancer or diseases diagnosis agents. It is aimed to synthesize a novel brain imaging agent including a promise for further studies on AD diagnosis potential and investigate its bioaffinity with biodistribution studies on healthy Balb/c mice. A novel radiolabeled agent was synthesized and characterized. Quality control of 99mTc-BH was performed utilizing solvent extraction and chromatographic (Radio TLC and Radio HPLC) methods. Bioaffinity of the 99mTc-BH was investigated on male Balb/c mice at various time points (5, 30, 60, 120 min post-injection). Paper electrophoresis showed that 99mTc-BH has a neutral structure. Radiochemical purity of 99mTc-BH was over 95 % with appropriate stability for imaging period. Selected brain regions have uptakes over 4 % ID/g following intravenous injection. Hippocampus has uptake approximately 10 % ID/g. 99mTc-BH has shown brain uptake, so it may prove to be valuable for brain imaging as a novel technetium-labeled agent. Further investigations with AD animal model are our on going effort to show that this agent has AD diagnosis potential. © 2014, Akadémiai Kiadó, Budapest, Hungary.
