Browsing by Author "Umur, N"

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    Investigation of the effect of metoclopramide on proliferation signal molecules in breast tissue
    Umur, N; Çalim, SI; Yazici, GN; Gurgen, SG
    Metoclopramide (MCP) is a drug that has been widely used in recent years due to its hyperprolactinaemia effect on mothers during breastfeeding. The aim of this study was to investigate the proliferative changes that MCP may cause in the maternal breast tissue. In this study, 18 Wistar albino young-adult breastfeeding mothers with their offspring were divided into three groups: control group, low-dose MCP-applied group and high-dose MCP-applied group. The experiment was carried out during the lactation period and at the end of 21 days. Prolactin, BrdU and Ki-67 breast tissue distributions were evaluated by immunohistochemistry, and tissue levels were evaluated biochemically by the ELISA method. According to ELISA and immunohistochemistry results in breast tissue, there was no significant difference between Ki-67 and BrdU results in all groups. Metoclopramide did not change the expression of proliferation molecules Ki-67 and BrdU in breast tissue. These results suggested that while metoclopramide increases breast proliferation, it does not have the risk of transforming the tissue into a tumour.
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    Effect of geldanamycin on the expression of the matrix molecules and angiogenetic factors in a gastric cancer cell line
    Gürpinar, T; Kosova, F; Kurt, FO; Cambaz, SU; Yücel, AT; Umur, N; Tuglu, MI
    Angiogenesis is the formation of new blood vessels. Angiogenesis affects cancer growth and is a useful target for cancer therapeutics. The effects of geldanamycin on angiogenesis in cases of gastric cancer are poorly understood. We investigated the effects of different doses of 17-allylamino-17-demethoxygeldanamycin (17-AGG), a semi-synthetic derivative of geldanamycin, on the interactions between cellular matrix proteins and angiogenesis factors in a gastric cancer cell line. We examined cancer cells on laminin and collagen I coated surfaces to determine their response to the angiogenic effect of these matrix molecules. We also evaluated the expression levels of VEGF, MMP-9, ES and TSP-1 using ELISA. We found that application of 17-AAG to the gastric cancer cell line on culture dish plastic decreased VEGF, TSP-1, ES and MMP-9 expression, whereas of all of these proteins were increased by laminin and collagen coating. 17-AAG currently is in clinical trial phase 2 and may be a promising drug for treatment of gastric cancer.
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    TGF-βs and SMADs Activities at the Site of Failed Neural Tube in the Human Embryos
    Barutcuoglu, M; Umur, AS; Vatansever, HS; Umur, N; Ozbilgin, K; Sayhan, S; Selcuki, M
    AIM: Transforming growth factor beta (TGF-beta) and Smads control intracellular signaling pathways in neurulation. Although previously reported similar experimental animal studies, the aim of this human study is to investigate the expression of TGF-beta (1,2,3) and Smads (1,2,3,6,7) in aborted human fetuses with myeloschisis. MATERIAL and METHODS: Twelve human fetuses with neural tube defect were obtained. They were stained with antibodies against TGF-beta 1, TGF-beta 2,TGF-beta 3, Smad (1,2,3), Smad 6 and Smad 7 using the indirect immunohistochemical technique. RESULTS: We noted mild immune reactivity of TGF-beta 1 and TGF-beta 2 in the open neural plate, motor neurons and surrounding tissue. Strong immune reactivity of TGF-beta 3 was shown in only open neural plate and surrounding tissue. Immunoreactivity of all Smads noted negative except Smad7. CONCLUSION: These results suggested at the site where the neural tube failed to close, TGF-beta 1,2 and Smads 1,2,3,6 do not continue their activity and decrease with internal timing of embryonic development. Additionally ectodermal layers are considered by embryo asnot closed wound and TGF-beta 3 activity may be an effort to repair the failed closure.
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    Evaluation of the Effects of Mobile Phones on the Neural Tube Development of Chick Embryos
    Umur, AS; Yaldiz, C; Bursali, A; Umur, N; Kara, B; Barutcuoglu, M; Vatansever, S; Selcuki, D; Selcuki, M
    AIM: The objective of this study is to examine the effects of radiation of mobile phones on developing neural tissue of chick embryos. MATERIAL and METHODS: There were 4 study groups. All Groups were placed in equal distance, from the mobile phones. Serial sections were taken from each Group to study the neural tube segments. RESULTS: The TUNEL results were statistically significant (p<0.001) at 30 and 48 hours in the third Group. We found low Bcl-2 levels partly in Group 4 and increased activity in Group 3. Caspase-3 was negative in the 48 and 72 hours in the Control Group, had moderate activity in the third Group 3, weak activity in the 48 hour, and was negative in the 72 hour in other groups. Caspase-9 immunoreactivity was weak in Group 1,2 and 3 at 30 hours and was negative in Group 1 and 4 at 48 and 72 hours. Caspase-9 activity in the third Group was weak in all three stages. CONCLUSION: Electromagnetic radiation emitted by mobile phones caused developmental delay in chick embryos in early period. This finding suggests that the use of mobile phones by pregnant women may pose risks.
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    Analysis of the Effects of Inhibitor and Activator Systems (Smad's Proteins) of TGF-βs on Chick Neural Tube Closure
    Umur, N; Vatansever, S; Umur, AS; Özbilgin, K; Selçuki, M
    The families of TGF-beta s and Smads proteins that controls its intracellular signaling pathways are known to play a role in early neurulation. The aim of this study is to demonstrate distribution of TGF-beta s (1, 2, 3) and Smads (1/2/3, 6, 7) proteins as a system in different hours of neural tube development of chick embryos. The SPF eggs were incubated at 37.8 +/- 2 degrees C for 24(th), 30(th), 48(th), 72(nd) h. After that, embryos were examined using immunohistochemistry and western blotting techniques. To the results, TGF-beta s immunoreactivities (particularly TGF-beta 3) at the 24(th), 30(th) and 48(th) h of chick development (during neural tube closure) were determined and decreased at the 72nd h (after neural tube closure), but expressions of TGF-beta s were detected in all stage of embryos in western blotting. While Smad 1/2/3 immunoreactivitiy and expression was less than that of the Smad 6 and 7 at the 24(th), it was increased at the 30(th) h. Smads proteins immunoreactivities were decresead at the 72(nd) h. In conclusion, the members of TGF-beta s are play a role in chick neural tube closure, the secretions of TGF-beta s are controlled different Smad proteins. In addition, immunoblotting results showed that TGF-beta s and Smads proteins were effective in the development of all tissues and organs of the embryos.
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    The Differentiation of Neuronal Cells from Mouse Embryonic Stem Cells
    Umur, N; Vatansever, HS; Umur, AS; Türköz, E; Özbilgin, K
    With new technologies emerging today, the importance of stem cells in the cell therapy of nervous system diseases is supported by recent studies. Therefore, the development of neuronal cell differentiation protocols from stem cells is of great importance. In our study, the differentiation of neuronal and neuroglial cells from mouse embryonic stem (ES) cell line and their analysis with neuronal cell markers are aimed. Mouse ES cells were differentiated to neurogenic series cells by adding N2 and bFGF to the culture medium on coated Fibronectin dishes. For the identification of differentiated cells, they were evaluated by light microscopy using immunhistochemistry techniques and by electron microscopy. Indirect immunohistochemical staining method was performed with SSEA-1 (mouse embriyonic stem cells marker), Nestin (neural precursor cells marker), beta III-Tubulin (neuronal cells marker), MAP-2 (neuronal cells marker), GFAP (astrocyte marker), and O4 (oligodendrocyte marker). After 1 week of differentiation of cells, immunoreactivities of SSEA-1 and Nestin were detected to be negative and moderate, respectively. After 2 weeks culture time, the differentiation was still continuing and especially positive immunoreactivities of beta-III Tubulin and MAP-2 and weak immunoreactivities of O4 and GFAP were supported neuronal differentiation. In conclusion, our results suggest that neuronal cell derived from mouse ES cells were differentiated particularly to neuron using N2+bFGF+fibronectin culture condition. Therefore, these differentiated cells may be used as a treatment method in degenerative diseases of the nervous system.
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    Congenital Dermal Sinus Tract of the Spine: Experience of 16 Patients
    Mete, M; Umur, AS; Duransoy, YK; Barutçuoglu, M; Umur, N; Gurgen, SG; Selçuki, M
    Congenital dermal sinus tract is a rare entity which lined by epithelial cells and can end anywhere between subcutaneous planes to thecal sac. These tracts may be accompanied with other pathologies such as lipomyelomeningocele, myelomeningocele, split cord malformation, tethered cord, filum abnormality and inclusion tumors and treatment includes resection of tract with intradural exploration. The authors review their experience with 16 cases. Clinical, radiological appearance and treatment of these lesions discussed with literature review.
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    Use of Chicken Embryos as an Angiogenesis Model for Central Nervous System Malignant Tumor Research
    Umur, N; Gurgen, SG; Sarsmaz, HY; Umur, AS
    AIM: To demonstrate the usability of chicken chorioallantoic membrane (CAM) as an angiogenesis model for the development and treatment of malignant tumors of the central nervous system. MATERIAL and METHODS: A fresh tumor tissue piece taken from Glioblastoma patients, a malignant tumor of the central nervous system, was transferred to the CAM of chicken embryos and left to incubate in the incubator and their development was monitored. After examining the results of the study macroscopically, CAM tissue samples were evaluated both histochemically and immunohistochemically in terms of angiogenic factors VEGF (Vascular Endothelial Growth Factor), bFGF (basic Fibroblast Growth Factor) and PDGF (Platelet Derived Growth Factor). RESULTS: According to histochemical findings obtained from our study when compared with control embryos, blood vessels, fibroblast count and inflammatory infiltration were observed more in the tumor transplanted groups, especially in the tumor -developing CAM region. There was also intense pleomorphism and marked hypercellularity in the cells. In our immunohistochemical findings, it was determined that bFGF, PDGF, VEGF staining intensities were higher in tumor transplanted groups compared to control groups, and this elevation was more pronounced in the tumor-developing region. CONCLUSION: As a result, it has been shown that the chicken embryo CAM model may be a suitable in vivo model for cancer angiogenesis studies. The protocol we created in this study will be a source for projects related to the use of therapeutic agents in cancer angiogenesis.
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    Simultaneous folate intake may prevent advers effect of valproic acid on neurulating nervous system
    Umur, AS; Selcuki, M; Bursali, A; Umur, N; Kara, B; Vatansever, HS; Duransoy, YK
    The aim of this study is to elucidate the preventive effect of folic acid (FA) on teratogenic effects of valporic acid (VA) in early stage chick embryos on neural tube development. One hundred and fifty specific pathogen-free (SPF) chick eggs were used to investigate the neurulation in five groups. Group A was the control group. Group B was injected 0.02 ml of saline (0.9% NaCl) and was used for sham group. VA (0.72 mg) in 0.02 ml saline was injected in Group C, and 0.342 mcg of FA in 0.02 ml NaCl were administered to the embryos in Group D. VA (0.72 mg) + 0.342 mcg of FA in 0.02 ml saline were administered simultaneously to the eggs in Group E. At the end of 72 h, all embryos were extracted from eggs and were fixed, and for histological analyses hematoxylin and eosine was used, for detection of apoptotic cells terminal deoxyribonucleotide transferase-mediated dUTP-X nick end labeling (TUNEL) was used and for distribution of P53, bcl-2 and caspase-3, caspase-6, caspase-8 and caspase-9 immunoperoxidase techniques were used. While there were no neural tube defects in the embryos of groups A, B and D, eight embryos died in group C and there were 12 embryos with retarded embryological development. In contrast to that, no death was observed in group E, but only eight embryos were detected with maldevelopmental delay stage. These results suggested that VA may induce apoptotic mechanisms but not through the p53 pathway. In addition, FA effectively prevents the teratogenic influence of VA on chick embryo at neurulation stages by stopping cascade of apoptosis before caspase 3 expression.
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    The Effect of Monosodium Glutamate on Neuronal Signaling Molecules in the Hippocampus and the Neuroprotective Effects of Omega-3 Fatty Acids
    Gürgen, SG; Sayin, O; Cetiin, F; Sarsmaz, HY; Yazici, GN; Umur, N; Yucel, AT
    Monosodium glutamate (MSG) is a flavoring substance added to many ready-to-eat foods and has known neurotoxic effects. This study was performed in order to examine the potential toxic effect of MSG on neurons in various regions of the hippocampus in prepubertal rats. It also investigated the protective effect of eicosapentaenoic acid (EPA) and docosahex-aenoic acid (DHA) on brain-derived neurotropic factor (BDNF), n-methyl-D-aspartate receptor (NMDA-R), and neuropeptide-Y (NPY) expression in the brain, using immunohistochemical and biochemical methods. Six female prepubertal Wistar albino rats were used in each group. Group 1, the control group, received 0.9% saline solution subcutaneously (sc) on days 1, 3, 5, 7, and 9. Group 2 received 4 mg/g MSG sc on days 1, 3, 5, 7, and 9. Group 3 received MSG + EPA (4 mg/g sc on days 1, 3, 5, 7, and 9. Oral 300 mg/kg for 9 d), while Group 4 received MSG + DHA (4 mg/g sc on days 1, 3, 5, 7, and 9 and 300 mg/kg orally for 9 d, respectively). At the end of the ninth day the hippocampal regions of the brain were removed and either fixed for immunohistochemical staining or stored at -80 degrees C for biochemical parameter investigation. BDNF, NMDA-R, and NPY expression results were evaluated using immunohistochemistry and an enzyme-linked immunosorbent assay. According to our findings, neurons in the control group hippocampal CA1 and DG regions exhibited strong BDNF, NPY, and NMDA-R reactions, while an expression in both regions decreased in the MSG group (p < 0.00). However, in the MSG-EPA and MSG-DHA groups, BDNF, NPY, and NMDA-R immunoreactions in neurons in the same region were similar to those of the control group (p = 0.00). No significant difference was observed in terms of expression in hippocampal neurons between the MSG-EPA and MSG-DHA groups (p > 0.00). In conclusion, since MSG caused a decrease in BDNF, NMDA-R, and NPY neural signaling molecules in the CA1 and DG regions of the hippocampus of prepubertal rats compared to the control group, care is required over the consumption of MSG, since it may affect memory-related neurons in these age groups. In addition, we concluded that the use of omega-3 fatty acids such as EPA and DHA in addition to MSG may protect against the neurotoxic effects of MSG.
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    An immunohistochemical study of the effects of various antioxidants on rat lung during chemotherapy
    Yazici, GN; Erdogan, D; Gürgen, SG; Sunar, M; Elmas, Ç; Umur, N; Ilgaz, C
    We investigated using immunohistochemistry the possible protective effects of ascorbic acid, alpha-tocopherol and selenium during chemotherapy treatment with cyclophosphamide. Thirty female Wistar rats were divided into five groups of six: group 1, untreated control; group 2, 75 mu g/kg cyclophosphamide; group 3, 75 mu g/kg cyclophosphamide + 150 mu g/kg/day alpha-tocopherol; group 4, 75 mu g/kg cyclophosphamide + 200 mu g/kg/day ascorbic acid and group 5, 75 mu g/kg cyclophosphamide + 40 ppm/kg/day selenium. Proliferating cell nuclear antigen (PCNA) staining was used to detect cell proliferation and AT(1) was used to evaluate structural damage. Caspase-8, caspase-9 and caspase-3 signal molecules were used to investigate apoptosis. In group 2, epithelium, alveolar macrophages, infiltrated lymphocytes and connective tissue were immunostained moderately to strongly with PCNA. Bronchus, alveolar wall and infiltrated lymphocytes were immunostained moderately to strongly with AT(1) and diffuse strong caspase immunoreactions were observed throughout the lung tissue. AT(1) and caspase immunoreactions in groups 4 and 5 were similar to group 2. In group 3, PCNA immunoreactivity was strong in the bronchiolus epithelium, endothelial cell nuclei and in stacks of infiltrated lymphocyte cell nuclei. In group 3, AT(1) and caspase immunoreactions were identical to group 1. It appears that alpha-tocopherol inhibits lung tissue damage in rats during chemotherapy.