Browsing by Author "Seda Vatansever H."

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    Significance of tyrosine kinase activity on malign transformation of ovarian tumors: A comparison between EGF-R and TGF-α
    (Elsevier GmbH, 2008) Zeren T.; Inan S.; Seda Vatansever H.; Ekerbicer N.; Sayhan S.
    Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-α) are members of the polypeptide growth factor family. The epidermal growth factor-receptor (EGF-R) is a receptor tyrosine kinase of the ErbB family. Many types of cancer, including ovarian cancer, display enhanced EGF-R immunoreactivity on their cell surface membranes. Also, an increase in TGF-α synthesis and secretion usually occurs in human carcinoma cell lines. In this study, we compared the immunoreactivities of TGF-α and EGF-R in ovarian tumors and related immunohistochemical findings to the histological type of the tumors. Formalin-fixed, paraffin wax-embedded tissue sections from 40 patients who had serous-mucinous borderline tumor and serous-mucinous adenocarcinoma of the ovary (n=10 each) were stained with hematoxylin-eosin and labeled for binding of primary antibodies against TGF-α and EGF-R using an avidin-biotin-peroxidase method. A semi-quantitative grading system was used to compare immunohistochemical labeling intensities. Increased immunoreactivity of EGF-R and moderate immunoreactivity of TGF-α was detected in adenocarcinomas. There was no significant difference in the immunoreactivity of TGF-α among the histologic types of ovarian tumors. The results of this study support the hypothesis that EGF-R may be a more useful marker than TGF-α in epithelial ovarian tumors. © 2007 Elsevier GmbH. All rights reserved.
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    Effects of ocreotide on intestinal mucosa in rats with portal hypertensive enteropathy
    (2009) Aydede H.; Seda Vatansever H.; Erhan Y.; Ilkgül O.
    To clarify the effects of long-term ocreotide (a long-acting somatostatin analogue) treatment on mucosal changes in a rat model of portal hypertensive enteropathy, groups of male Swiss albino rats (n=15 each) were randomly assigned to one of three treatment arms. These were: sham laparotomy+twice daily subcutaneous saline 0.5 mL (Group 1); portal hypertension induction+twice daily subcutaneous saline 0.5 mL (Group 2); and portal hypertension induction+subcutaneous ocreotide 100 μg/kg/12 h (Group 3). After 12 weeks of treatment, jejunal and ileal tissue specimens were obtained and evaluated histopathologically (villus/crypt ratio, mean diameter of dilated vessels, mucosal edema, and fibromuscular proliferation in the lamina propria) and immunohistochemically (vascular endothelial growth factor (VEGF), von Willebrand factor (F8), and cluster of differentiation 34 (CD34) labelling). In jejunal specimens, the villus/crypt ratio was markedly lower in Group 2 (2.38±0.46 μm) than in Group 1 (5.07±2.25 μm) or Group 3 (4.97±2.19 μm); mean diameter of dilated vessels was markedly higher in Group 2 (43.30±5.71 μm) than in Group 1 (33.53±4.00 μm) or Group 3 (36.76±3.96 μm); mucosal edema and fibromuscular proliferation were universally absent in Group 1 when compared with the other groups. There were statistically significant differences (p<0.05) between Groups 1 and 2 for villus/crypt ratio, mean diameter of dilated vessels, VEGF immunolabelling intensity, and CD34 immunolabelling intensity; between Groups 1 and 3 for mean diameter of dilated vessels, VEGF immunolabelling intensity, and CD34 immunolabelling intensity; and between Groups 2 and 3 for villus/crypt ratio, mean diameter of dilated vessels, and VEGF immunolabelling intensity. In ileal tissue specimens, the villus/crypt ratio was markedly lower in Group 2 (5.51±0.67 μm) than in either Group 1 (7.19±2.18 μm) or Group 3 (7.62±2.58 μm); mean diameter of dilated vessels was markedly higher in Group 2 (46.36±4.77 μm) than in either Group 1 (36.43±4.57 μm) or Group 3 (41.31±4.70 μm); while mucosal edema was absent in Group 1, it was present in Group 2 and Group 3; and fibromuscular proliferation was universally absent. There were statistically significant differences (p<0.05) between Groups 1 and 2 for villus/crypt ratio and mean diameter of dilated vessels; between Groups 1 and 3 for mean diameter of dilated vessels; and between Groups 2 and 3 for villus/crypt ratio, mean diameter of dilated vessels, and VEGF immunolabelling intensity. Together, these findings indicate that ocreotide treatment ameliorates histomorphological changes in a rat model of portal hypertensive enteropathy. © 2008 Elsevier GmbH. All rights reserved.
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    Propolis from Turkey induces apoptosis through activating caspases in human breast carcinoma cell lines
    (2010) Seda Vatansever H.; Sorkun K.; Ismet Deliloĝlu Gurhan S.; Ozdal-Kurt F.; Turkoz E.; Gencay O.; Salih B.
    Propolis is a sticky substance that is collected from plants by honeybees that has anti-mutagenic and anti-carcinogenic properties with biological and therapeutic effects. The target of this study was to investigate the anti-apoptotic effect of propolis extracts (PE) on the caspase pathway in the human breast cell line MCF-7 in culture. Seven different propolis extracts, numbered PE 1-7, produced in their natural ecological environment, were collected from the Hacettepe University Beytepe Campus area in Ankara, Turkey. Individual extracts at 0.5, 0.25, 0.125 and 0.063 mg/ml were incubated with MCF-7 cells during 2 days culture. Cell growth and cytotoxicity were measured colorimetrically by MTT assay. Apoptotic cell death was determined by the TUNEL method (terminal deoxynucleotidyltransferase-biotin nick end-labelling) and caspase activity was investigated by immunocytochemistry using antibodies directed against caspase 6, caspase 8 and caspase 9. The results showed that the PE 5 and 6 extracts at 0.125 mg/ml dilution induced apoptosis in association with increased number of TUNEL positive cells. MTT results showed that cultures exposed to the same extracts and at the same dilution experienced better cell growth compared to those cultures exposed to the other extracts. Immunpositivity for all caspases was detected after treatment with all the extracts and at all dilutions, with stronger immunoreactivity for caspase 6 than caspases 8 and 9. Caspase 6 labelling was especially strong in PE 5 and PE 6. We conclude that propolis may have anti-tumour effects by increasing apoptosis through the caspase pathway. Such propolis extracts may be important economically and allow development of a relatively inexpensive cancer treatment. © 2009 Elsevier GmbH.
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    Jak-Stat signaling pathway may play a role in the pathogenesis of cholesteatoma
    (2014) Eskiizmir G.; Seda Vatansever H.; Özgür E.; Aslan A.; Tanyeri G.; Gözüaçik D.; Kemal Özbilgin M.; Cingi C.
    Purpose Jak-Stat signaling pathway is one of the major signal transduction cascades which regulates most of the cellular events such as cell proliferation, differentiation, cell migration and apoptosis. This study aims to determine the activity of Jak-Stat signaling pathway in the pathogenesis of cholesteatoma. Materials and Methods Cholesteatoma and skin samples were obtained from 10 patients who underwent tympanomastoidectomy for chronic otitis media with cholesteatoma. Immunohistochemical analysis of cholesteatoma and skin was performed using anti-Jak1, anti-Jak2, anti-Jak3, anti-Stat1, anti-Stat2, anti-Stat3, anti-Stat4 and anti-Stat5 antibodies. The immunoreactivities in cholesteatoma and skin were quantified using H-score measurement and statistical comparison was performed. Results Jak1, Jak2, Jak3, Stat1 and Stat3 immunoreactivities were not detected in cholesteatoma; in contrast to the skin (129.8; 226.7; 33.0; 66.4;115.9). In addition, when H-score measurements of Stat2, Stat4 and Stat5 immunoreactivities were compared between cholesteatoma (172.8; 166.7; 120.0) and skin (400.0; 284.9; 292.0), statistically significant differences were found (p < 0.0001, p < 0.0001, p < 0.0001). Conclusions A remarkable deficiency in the family members of Jak-Stat signaling pathway was demonstrated in cholesteatoma. Therefore, perturbations in Jak-Stat signaling pathway may play a role in the pathogenesis of cholesteatoma. © 2014 Elsevier Inc.
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    In vivo evaluation of cerium, gallium and vanadium-doped borate-based bioactive glass scaffolds using rat subcutaneous implantation model
    (Elsevier Ltd, 2016) Deliormanlı A.M.; Seda Vatansever H.; Yesil H.; Özdal-Kurt F.
    The main objective of this study was to evaluate the cerium, gallium and vanadium-containing bioactive borate glass scaffolds for soft tissue applications and determine the potential toxicity of these scaffolds on the adjacent tissues. The effects of the cerium, gallium and vanadium substitution on the soft tissue ingrowth and angiogenesis in porous borate based bioactive glass scaffolds were investigated using rat subcutaneous implantation model. For this purpose, bioactive borate glass powders containing therapeutic ions were prepared by melt-cast method and subsequently scaffolds were fabricated using polymer foam replication technique. The scaffolds were implanted subcutaneously for 4 weeks in Sprague Dawley rats. Bare borate glass scaffolds with the same microstructure were used as the control. Histology was used to evaluate tissue ingrowth and blood vessel formation in the implants. Additionally, the antibacterial activities of cerium, gallium and vanadium containing porous bioactive glass scaffolds were investigated in vitro by a zone inhibition method. Results revealed that addition of cerium ions to the borate glass network caused an increase in blood vessel formation. On the other hand, a decrease was obtained in angiogenesis in gallium and vanadium-containing glasses. All of the scaffolds prepared in the study did not show any antibacterial activity towards Escherichia coli and Staphylococcus aureus. © 2016 Elsevier Ltd and Techna Group S.r.l.
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    Synthesis and cytotoxic activities of organometallic Ru(II) diamine complexes
    (Academic Press Inc., 2020) Kavukcu S.B.; Şahin O.; Seda Vatansever H.; Kurt F.O.; Korkmaz M.; Kendirci R.; Pelit L.; Türkmen H.
    A series of mono and bimetallic ruthenium(II) arene complexes bearing diamine (Ru1-6) were prepared and fully characterized by 1H, 13C, 19F, and 31P NMR spectroscopy and elemental analysis. The crystal structure of the bimetallic complex (Ru5) was determined by X-ray crystallography. Monometallic analogues (Ru1-3) were synthesized to investigate the contributions of ruthenium and the other organic groups (aren, ethylenediamine, butyl) to the activity. The electrochemical behaviors of mono and bimetallic complexes were obtained from the relationship between cyclic voltammetry (CV) and the biological activities of the compounds. The cytotoxic activities of the complexes (Ru1-6) were tested against wide-scale cancer cell lines, namely HeLa, MDA-MB-231, DU-145, LNCaP, Hep-G2, Saos-2, PC-3, and MCF-7, and normal cell lines 3T3-L1 and Vero. Diamine Ru(II) arene complexes have unique biological characteristics and they are promising models for new anticancer drug development. MTT analysis reveals that each synthesized Ru complex showed cytotoxic activity towards the different cancer cells. In particular, three Ru complexes (Ru3, Ru5 and Ru6) showed less toxic effects on the cancer cells than the others. These novel Ru complexes affected both cancer and normal cell lines. As they had a toxic effect on the cells, the dosage applied should be tested before being used for in vivo applications. Cytotoxicity tests have shown that the bimetallic complex Ru6 was effective on all cancer cells. The effect of bimetallic enhancement on cancer cell lines, the systematic variation of the intermetallic distance and the ligand donor properties of the mono and bimetallic complexes were explored based on the cytotoxic activity. The interaction with FS-DNA and the stability/aquation of the complexes (Ru3 and Ru6) were investigated with 1H NMR spectroscopy. The binding modes between the complexes (Ru3 and Ru6) and DNA were investigated via UV–Vis spectroscopy. © 2020 Elsevier Inc.
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    Composition and antibacterial, anti-inflammatory, antioxidant, and anticancer activities of Rosmarinus officinalis L. essential oil
    (Elsevier B.V., 2023) Becer E.; Altundağ E.M.; Güran M.; Seda Vatansever H.; Ustürk S.; Hanoğlu D.Y.; Hüsnü Can Başer K.
    Rosemary is a culinary herb that is widely used in traditional medicine for its nutritional value and pharmacological properties. The aim of this study was to investigate the composition, in vitro anticancer, antioxidant, and antibacterial activities of rosemary essential oil. Rosemary essential oil components were simultaneously analysed by GC/MS and GC/FID techniques. Different concentrations of rosemary essential oil were incubated for 24 and 48 h with HepG2 and EV304 cells. Cell viability was measured by MTT assay. Anticancer activities of rosemary essential oil were investigated by immunocytochemistry using antibodies directed against Ki-67, β-catenin, c-myc, Oct-3/4, and IL-8. Anti-inflammatory and antioxidant activity were evaluated with protein denaturation and DPPH assays, respectively. The anti-bacterial effect of rosemary essential oil was analysed by Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae with the broth microdilution and agar zone diffusion methods. Camphor (15.1%), verbenone (14.3%), α-pinene (13.6%), 1,8-cineole (11.8%), and borneol (7.9%) were determined as the major compounds of rosemary essential oil. The activities of the oil were found to be 508.7 µg/ml and 525.7 µg/ml against HepG2 and ECV304 cells, respectively. Ki-67, β-catenin, c-myc, Oct-3/4, and IL-8 immunoreactivities were significantly reduced in rosemary essential oil-treated HepG2 cells. Ki-67 and β-catenin immunoreactivities were significantly decreased only in rosemary essential oil-treated ECV304 cells. Also, the essential oil showed antioxidant and free radical scavenging activities. Rosemary essential oil showed effective antibacterial activity on E. coli and K. pneumoniae. Thus, rosemary essential oil could be a potential candidate as a therapeutic agent in cancer treatment. © 2023 SAAB