Kalaycı, Özlem A. | Cömert, Füsun B. | Hazer, Baki | Atalay, Turgay | Cavicchi, Kevin A. | Çakmak, Mükerrem
Article | 2010 | Polymer Bulletin65 ( 3 ) , pp.215 - 226
The synthesis, spectroscopic characterization, and antimicrobial efficiency of gold and silver nanoparticles embedded in novel amphiphilic comb-type graft copolymers having good film-forming properties have been described. Amphiphilic comb-type graft copolymers were synthesized by the reaction of chlorinated polypropylene (PP) (Mw = 140,000 Da) with polyethylene glycol (PEG) (Mn = 2,000 Da) at different molar ratios. Metal nanoparticles embedded graft copolymers were prepared by reducing solutions of the salts of silver or gold and the copolymer in tetrahydrofuran. The optical properties of the metal nanoparticle embedded copolymers . . . were determined by using UV-visible spectroscopy. Surface plasmon resonance (SPR) of the gold and silver nanoparticle embedded copolymers in toluene was observed at a maximum wavelength (?max) of 428 and 551 nm in the UV-VIS absorption spectra, respectively. The average particle diameters of the gold and silver nanoparticles were found to be 50 nm from the high resolution scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Amphiphilic polymer films containing silver and gold nanoparticles were found to be highly antimicrobial by virtue of their antiseptic properties to Escherichia coli and Staphylococcus aureus. © Springer-Verlag 2009 Daha fazlası Daha az
Özaçmak, Veysel Haktan | Özaçmak-Sayan, Hale
Other | 2010 | Türk Geriatri Dergisi13 ( 3 ) , pp.160 - 165
Giriş: Turmeriğin majör komponenti olan kurkumin hem antioksidan hem de antiinflamatuar aktivite göstermektedir. Çalışmamızda, kronik serebral hipoperfüzyon modelini kullanarak, overleri alınmış dişi sıçan beyininde, kurkuminin oksidatif stresi azaltıp azaltmadığını araştırdık. Gereç ve Yöntem: Kronik serebral hipoperfüzyon, her iki karotid komunis arterin kalıcı ligasyonu ile sağlandı. Denekler (4-6 aylık toplam 30 adet yetişkin Wistar Albino dişi sıçanlar) rastgele üç gruba ayrıldı: sham kontrol, iskemi ve 14 gün boyunca günlük kurkumin (100 mg/kg) verilen iskemi grubu. Ligasyon sonrası 14üncü günde tüm gruplardaki beyin dokuların . . .ın malondialdehid (MDA) ve indirgenmiş glutatyon (GSH) içerikleri ölçüldü. Bulgular: İskemi, MDA içeriğinin ileri dercede yükselmesine neden olurken GSH seviyesini anlamlı derecede azalttı. Diğer yandan, kurkumin tedavisi iskemik beyin dokusunda anlamlı derecelerde MDA düzeyini düşürerek ve GSH içeriğini yükselterek, değerlerin sham grubundakiler seviyesine geri dönmesini sağladı. Sonuç: Elde ettiğimiz sonuçlar, vasküler demansın deneysel hayvan modeli olan kronik serebral hipoperfüzyonda kurkuminin hem oksidatif stresi hem de lipid peroksidasyonunu azalttığını önermektedir. Altta yatan moleküler mekanizmaların derinlemesine daha fazla araştırılması sonrasında inanıyoruz ki kurkuminin tedavideki verimliliği, klinik uygulamalar için özellikle de vasküler demanslı menopoz sonrası yaşlı kadınlarda test edilmesine layık olacaktır. Introduction: Curcumin, the major constituent of turmeric, exhibits both antioxidant and anti-inflammatory activities. In the present study, we investigated whether or not curcumin reduces oxidative stress in ovariectomized female rat brain by using a model of chronic cerebral hypoperfusion. Materials and Method: Chronic cerebral hypoperfusion was induced by permanent ligation of both common carotid arteries. Animals (a total of 30 adult female Wistar Albino rats, 4-6 months old) were randomly divided into three groups: sham control, ischemia, and ischemia plus daily curcumin treatment (100 mg/kg) for 14 days. At day 14 after the ligation, malondialdehyde (MDA) and reduced glutathione (GSH) contents of brain tissues were measured in all groups. Results: Ischemia caused a significant increase in MDA content but a meaningful decrease in GSH levels. Treatment with curcumin, however, lowered MDA and elevated GSH contents significantly in ischemic brain tissue, bringing their levels back to that of the sham group. Conclusion: Our results suggest that curcumin attenuates both oxidative stress and lipid peroxidation in chronic cerebral hypoperfusion, which is an animal model of vascular dementia. Following further in depth investigations into underlying molecular mechanism(s), we believe that therapeutic efficacy of curcumin deserves to be tested for potential clinical application especially in postmenopausal elderly women suffering from vascular dementia Daha fazlası Daha az
Kandemir, N. O. | Gun, B. D. | Bahadir, B. | Yurdakan, G. | Ozdemir, N. | Karadayi, N. | Ozdamar, S. O.
Article | 2010 | CLINICAL AND EXPERIMENTAL DERMATOLOGY35 ( 5 ) , pp.525 - 530
Background. Kaposi's sarcoma is a multicentric, low-grade, vascular neoplasia. Human herpesvirus 8 is associated with all epidemiological forms of KS and has been shown in vitro to induce the tyrosine receptor kinase c-Kit in infected cells. Aim. To investigate the expression of c-Kit in cases of classic KS and to clarify its association with clinicopathological parameters and HHV8 latency-associated nuclear antigen-1 expression. Methods. In total, 35 cases of classic KS at various histological stages were included in the study. Age and gender of the patients and location and histological stage of the tumours were recorded. Formalin . . .-fixed, paraffin wax-embedded tissue sections were stained by immunohistochemistry with antibodies to c-Kit and HHV8. Results. c-Kit immunoreactivity was found in 22 cases and HHV8 immunoreactivity was present in all cases. There was no correlation in c-Kit immunoreactivity between clinicopathological parameters and HHV8 immunoreactivity. Conclusions. The results of our study show that in cases of classic KS there is a high rate of c-Kit immunoreactivity, but c-Kit expression does not show any correlation with HHV8 immunoreactivity Daha fazlası Daha az
Kandemir, Nilüfer Onak | Gün, Banu Doğan | Barut, Figen | Yurdakan, Gamze | Bahadır, Burak | Bektaş, Sibel | Gün, Mustafa | Keser, Sevinç Hallaç | Özdemir, Nagehan | Özdamar, Şükrü Oğuz
Article | 2010 | TURKDERM-TURKISH ARCHIVES OF DERMATOLOGY AND VENEROLOGY44 ( 2 ) , pp.73 - 78
Background and Design: Kaposi sarcomas (KS) are vascular tumors with a low malignant potential which include overlapping infectious, immunologic, and neoplastic processes. Recently, many histological subtypes have been defined. Material and Method: In the present study, 151 cutaneous classic KS lesions in 56 patients were retrospectively evaluated with regard to histological subtypes. Determination of the subtypes was based on the predominant histopathological component in the lesion. We examined changes in epidermis and dermis along with intratumoral inflammatory response characteristics in the lesions. By defining histopathologica . . .l variants of the cases, differences regarding subtypes were investigated. Results: Cases that bear the ordinary characteristics of KS and those that can not be classified otherwise, comprised 82..8% of the study group. Twenty-six cases showed consistency with the subtypes outlined in the literature in terms of their histopathological properties. The most common histological subtype was the lymphangiectatic variant in 7.3% of the cases. Bullous (2.6%), lymphangioma like (2.6%), intravascular (2%), and pyogenic granuloma like (2%) variants were less common. The most uncommon histological subtype was micronodular (0.6%) type. Lymphangiectatic, bullous, intravascular, and pyogenic granuloma like variants were frequently observed in the nodular stage of KSs. Lympangioma like changes were seen to be present in the early KS lesions. Lymphangiectatic type was oftenly associated with bullous component, whereas pyogenic granuloma like type demonstrated superficial ulceration and intense inflammatory response. Lymphangioma like and intravascular types exhibited a characteristic appearance, while other variants were accompanied by components belonging to different subtypes. Conclusion: In KS, histopathological subtypes can develop as a result of different pathological processes. The next stage of the current study, which is one of the largest case series in the literature, will be investigation of the clinical and prognostic characteristics of the variants. (Turkderm 2010; 44: 73-8 Daha fazlası Daha az
Cömert M. | Karakaya K. | Barut F. | Karadeniz Çakmak G. | Uçan H.B. | Gültekin F.A. | Emre A.U.
Article | 2010 | Ulusal Travma ve Acil Cerrahi Dergisi16 ( 5 ) , pp.383 - 389
Background The aim of this study was to investigate whether intraabdominal Ankaferd Blood Stopper (ABS) causes increased intraabdominal adhesion formation and to determine any side effects of ABS in vivo. Methods The present experimental study was designed to examine the effects of Ankaferd solution on peritoneal adhesion formation in a rat model of cecal abrasion. Intraperitoneal adhesions were assessed macroscopically and histopathologically on the 10th postoperative day. The possible adverse affects of ABS on liver and lung tissues were analyzed histopathologically, and blood chemistry was also evaluated. Results Our study reveal . . .ed that ABS reduced intraperitoneal adhesion formation in an experimental rat model. The blood chemistry was not disturbed due to ABS administration. Intraperitoneal administration of ABS led to some minor changes in the lungs and serosal surfaces of the intestines, with minor architectural changes in the liver that were not considered as toxic. Further studies with various application doses and routes with more detailed cellular analysis are thus warranted to clarify the possible pleiotropic and adverse effects of this new agent away from hemostasis. Conclusion There was less intraperitoneal adhesion formation in the ABS group than in the control group and saline group. Intraperitoneal administration of ABS has no toxic effects on blood chemistry or the lungs, kidneys and the liver, but it has some minor adverse effects Daha fazlası Daha az
Kandemir O. | Buyukates M. | Kandemir N.O. | Aktunc E. | Gul A.E. | Gul S. | Turan S.A.
Article | 2010 | Journal of Cardiothoracic Surgery5 ( 1 ) , pp.383 - 389
Background: Ankaferd Blood Stopper®(ABS) is a folkloric medicinal plant extract used as a hemostatic agent in traditional Turkish medicine. This experimental study investigated the histopathological and immunohistochemical effects of ABS on vascular tissue in a rat model of aortic bleeding.Methods: Four groups of 11 Wistar albino rats were used. The abdominal aortas of the rats were wounded; an ABS-soaked tampon was applied to rats in Groups 1 and 3, and a plain gauze tampon was applied to rats in Groups 2 and 4 until the bleeding stopped. The bleeding time was recorded. Immediately following sacrificing, the arteriotomy sites from . . .Groups 1 and 2 were removed. The abdominal incisions in Groups 3 and 4 were closed following hemostasis. On Day 7 of the study, Group 3 and 4 rats were sacrificed and the abdominal aorta arteriotomy sites were removed for histopathological and immunohistochemical evaluation.Results: The mean bleeding time in 15 animals in Groups 2 and 4 was 4.9 ± 0.6 s, and in 22 animals in Groups 1 and 3 was 3.1 ± 0.6 s. Distal aortic occlusion was not observed on either Day 1 or 7 in any group. Significantly more widespread and dense endothelial nitric oxide synthase (eNOS) staining was observed in Group 1 animals than Group 2. On Days 1 and 7 after application of ABS, histopathological changes, consisting of necrosis, inflammation, and endothelial cell loss, in the rat abdominal aortas did not differ between Groups 1 and 2. The basophilic discoloration in the ABS group on the operation day was a result of a foreign body reaction and hemosiderin-loaded histiocyte accumulation, which occurred on Day 7.Conclusions: In this study, hemostasis was successfully achieved with ABS in rat abdominal aortas. No histopathological change was found in the rat abdominal aortas between the ABS and control groups on Days 1 and 7. Further studies on the long-term effects of foreign body reactions and hemosiderin-loaded histiocyte accumulation are required. © 2010 Kandemir et al; licensee BioMed Central Ltd Daha fazlası Daha az
Gul A.E. | Keser S.H. | Barisik N.O. | Kandemir N.O. | Cakir C. | Sensu S. | Karadayi N.
Article | 2010 | Diagnostic Pathology5 ( 1 ) , pp.383 - 389
Background: Endometrial carcinoma (EC) is the most common malignancy of the female genital tract. Gene alterations and overexpression of various oncogenes are important in tumor development. The human HER 2 neu (c-erbB-2) gene product is a transmembrane receptor with an intracellular tyrosine kinase that plays an important role in coordinating the endometrial growth factor receptor signaling network. The aim of this study was to investigate the expression of c-erbB-2 in endometrial cancer, to study its correlation to established prognostic parameters and estrogen receptor (ER) and progesterone receptor (PR) status.Methods: Immunohis . . .tochemical (IHC) analyses of ER, PR and c-erbB-2 were performed in 72 EC cases.Results: We detected a positive staining with c erbB 2 in 18.1% of the cases and determined a statistically significant relation between c-erbB-2 and PR. We could not find a statistically significant relation between c-erbB-2 staining and ER. There was not a statistically significant difference between c-erbB-2 and histological grade. The highest level of c-erbB-2 was found in grade 2 cases. There was not any statistically significant relation between c-erbB-2 and menstrual status, myometrial invasion, lymph node status, stage and survival.Conclusions: Although our study provides additional evidence of the potential prognostic role of c-erbB-2, further prospective and controlled studies are required to validate their clinical usefulness. © 2010 Gul et al; licensee BioMed Central Ltd Daha fazlası Daha az
Kandemir N.O. | Gun B.D. | Bahadir B. | Yurdakan G. | Ozdemir N. | Karadayi N. | Ozdamar S.O.
Article | 2010 | Clinical and Experimental Dermatology35 ( 5 ) , pp.525 - 530
Background. Kaposi's sarcoma is a multicentric, low-grade, vascular neoplasia. Human herpesvirus 8 is associated with all epidemiological forms of KS and has been shown in vitro to induce the tyrosine receptor kinase c-Kit in infected cells. Aim. To investigate the expression of c-Kit in cases of classic KS and to clarify its association with clinicopathological parameters and HHV8 latency-associated nuclear antigen-1 expression. Methods. In total, 35 cases of classic KS at various histological stages were included in the study. Age and gender of the patients and location and histological stage of the tumours were recorded. Formalin . . .-fixed, paraffin wax-embedded tissue sections were stained by immunohistochemistry with antibodies to c-Kit and HHV8. Results. c-Kit immunoreactivity was found in 22 cases and HHV8 immunoreactivity was present in all cases. There was no correlation in c-Kit immunoreactivity between clinicopathological parameters and HHV8 immunoreactivity. Conclusions. The results of our study show that in cases of classic KS there is a high rate of c-Kit immunoreactivity, but c-Kit expression does not show any correlation with HHV8 immunoreactivity. © 2009 British Association of Dermatologists Daha fazlası Daha az
Yildirim N. | Dogan S.M. | Aydin M. | Hekimoglu K. | Gungorduk A.
Erratum | 2010 | International Journal of Cardiology138 ( 3 ) , pp.525 - 530
[No abstract available]
Barut F. | Barut A. | Dogan Gun B. | Kandemir N.O. | Aktunc E. | Harma M. | Harma M.I.
Article | 2010 | Pathology Research and Practice206 ( 9 ) , pp.651 - 656
Ischemia, hypoxia, and elevated vascular resistance disturb placental functions by increasing oxidative stress. Heat shock protein 70 (HSP70) is an oxidative stress marker. Endothelial nitric oxide synthase (eNOS) is a nitric oxide enzyme with a key role in pathologic and physiologic angiogenesis and vasculogenesis. This study was performed to investigate the role of oxidative stress in the pathogenesis of preeclampsia and intrauterine growth-restricted (IUGR) pregnancies by comparing the levels of HSP70 and eNOS in placentas from women with these diseases and those with healthy pregnancies.HSP70 and eNOS were examined using the str . . .eptavidin-biotin-peroxidase complex technique on formalin-fixed, paraffin-embedded sections from 135 placental villous tissues obtained from normal pregnancies (n=45) and pregnancies complicated with preeclampsia (n=45) and IUGR (n=45). The intensity of labeling in placental tissues with antibodies to HSP70 and eNOS was scored between 0 and 3, using a semiquantitative scale.HSP70 and eNOS levels were increased in the syncytiotrophoblasts, cytotrophoblasts, and extravillous trophoblast cells of preeclamptic and IUGR placentas ( Daha fazlası Daha az
Onak Kandemir N. | Bektaş S. | Barut F. | Bahadir B. | Yurdakan G. | Dogan Gun B. | Mungan A.
Article | 2010 | Turk Onkoloji Dergisi25 ( 2 ) , pp.49 - 56
OBJECTIVES: The contribution of cytological methods to the diagnosis and follow-up of urinary system malignancies was investigated in this study, along with histological diagnosis and clinical follow-up results of the cases. METHODS: One hundred forty-four cases who underwent cystoscopy in ZKÜTF Urology Department between 2003 and 2007 were included in this study, and urinary cytology and biopsy samples were assessed in the Pathology Department. RESULTS: When cytological and histological diagnoses were compared, results in 17 positive cases and in 109 negative cases were consistent. Three cases were false-positive and 15 cases were . . .false-negative. In our series, sensitivity of urinary cytological diagnostic methods was 53% and specificity was 97%. CONCLUSION: Our study shows that urinary cytology has a high diagnostic value in the evaluation of urinary system diseases. However, decrease in the sensitivity of this method in low-grade urothelial tumors should be taken into account. © 2010 Association of Oncology Daha fazlası Daha az
Barut F. | Barut A. | Gun B.D. | Kandemir N.O. | Harma M.I. | Harma M. | Aktunc E.
Article | 2010 | Diagnostic Pathology5 ( 1 ) , pp.49 - 56
Background: Vascular endothelial growth factor (VEGF), basic-fibroblast growth factor (b-FGF), and endothelial nitric oxide synthase (eNOS) are factors that take part in placental angiogenesis. They are highly expressed during embryonic and fetal development, especially in the first trimester. In this study, we aimed to investigate the role of placental angiogenesis in the development of intrauterine growth restriction (IUGR) by comparing the levels of expression of VEGF-A, b-FGF, and eNOS in normal-term pregnancy and IUGR placentas.Methods: The expression of VEGF-A, b-FGF, and eNOS was studied using the avidin-biotin-peroxidase met . . .hod in placental tissues diagnosed as normal (n = 55) and IUGR (n = 55). Results were evaluated in a semi-quantitative manner.Results: The expression of all the markers was significantly higher (p < 0.001) in cytotrophoblasts, syncytiotrophoblasts, extravillous trophoblasts, vascular smooth muscle cells, chorionic villous stromal cells, and villous vascular endothelial cells of the IUGR placentas when compared with those collected from normal-term pregnancies.Conclusion: Increased expression of VEGF-A, b-FGF, and eNOS may be the result of inadequate uteroplacental perfusion, supporting the proposal that abnormal angiogenesis plays a role in the pathophysiology of IUGR. © 2010 Barut et al; licensee BioMed Central Ltd Daha fazlası Daha az