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Pituitary Metastasis of Colon Adenocarcinoma: A Rare Occurrence

Ozturk, M.A. | Eren, O.O. | Sarikaya, B. | Aslan, E. | Oyan, B.

Article | 2014 | Journal of Gastrointestinal Cancer45 ( 1 ) , pp.85 - 87

[No abstract available]

Antimicrobial properties of zeolite-X and zeolite-A ion-exchanged with silver, copper, and zinc against a broad range of microorganisms

Demirci, S. | Ustaoglu, Z. | Yilmazer, G.A. | Şahin, Fikrettin | Baç, N.

Article | 2014 | Applied Biochemistry and Biotechnology172 ( 3 ) , pp.1652 - 1662

Zeolites are nanoporous alumina silicates composed of silicon, aluminum, and oxygen in a framework with cations, water within pores. Their cation contents can be exchanged with monovalent or divalent ions. In the present study, the antimicrobial (antibacterial, anticandidal, and antifungal) properties of zeolite type X and A, with different Al/Si ratio, ion exchanged with Ag+, Zn2+, and Cu2+ ions were investigated individually. The study presents the synthesis and manufacture of four different zeolite types characterized by scanning electron microscopy and X-ray diffraction. The ion loading capacity of the zeolites was examined and . . .compared with the antimicrobial characteristics against a broad range of microorganisms including bacteria, yeast, and mold. It was observed that Ag+ ion-loaded zeolites exhibited more antibacterial activity with respect to other metal ion-embedded zeolite samples. The results clearly support that various synthetic zeolites can be ion exchanged with Ag+, Zn2+, and Cu2+ ions to acquire antimicrobial properties or ion-releasing characteristics to provide prolonged or stronger activity. The current study suggested that zeolite formulations could be combined with various materials used in manufacturing medical devices, surfaces, textiles, or household items where antimicrobial properties are required. © 2013 Springer Science+Business Media Daha fazlası Daha az

Effects of restoration of the euthyroid state on epicardial adipose tissue and carotid intima media thickness in subclinical hypothyroid patients

Yazıcı, D. | Özben, B. | Toprak, A. | Yavuz, D. | Aydın, H. | Akalın, S.

Article | 2015 | Endocrine48 ( 3 ) , pp.909 - 915

Epicardial adipose tissue (EAT) thickness is a novel cardiovascular risk indicator, whereas carotid intima media thickness (CIMT) is a known marker of subclinical atherosclerosis. The aim of this study was to measure EAT thickness and CIMT in subclinical hypothyroid (SCH) patients and to determine the effect of restoration of the euthyroid state on these variables. The study included 43 patients with SCH (mean age: 35.2 ± 10.7 years; F–M ratio: 42:1) and 30 healthy controls (mean age: 34.5 ± 8.2 years; F–M ratio: 25:5). EAT thickness and CIMT were measured via conventional echocardiography and ultrasonography. Among the patients, 23 . . . were followed up with l-thyroxine replacement until restoration of the euthyroid state and re-evaluated 6 months after baseline. Basal EAT thickness was higher in the SCH patients than in the controls (3.2 ± 0.7 vs. 2.3 ± 0.3 mm—p < 0.0001), whereas CIMT was similar in both groups (0.50 ± 0.09 vs. 0.48 ± 0.04 mm). EAT thickness was correlated with CIMT in the patient group (r = 0.39, p = 0.01), but this correlation was not evident based on multivariate analysis when corrected for age and body mass index (r 2  = 0.47 and p = 0.0001 for the model). In the follow-up patient subgroup, both EAT thickness and CIMT decreased significantly following l-thyroxine treatment, when normal TSH levels were attained (3.4 ± 0.7 vs. 2.3 ± 0.5 mm—p = 0.007 and 0.51 ± 0.09 vs. 0.46 ± 0.07 mm—p = 0.01, respectively). EAT thickness was greater in the SCH patients than in controls, whereas CIMT was similar in both groups. Restoration of the euthyroid state with l-thyroxine treatment was associated with significant decreases in EAT thickness and CIMT in the group of patients that received l-thyroxine treatment and, as such, might reduce the cardiovascular risk associated with SCH. © 2014, Springer Science+Business Media New York Daha fazlası Daha az

Effect of f68 on cryopreservation of mesenchymal stem cells derived from human tooth germ

Doğan, A. | Yalvaç, M.E. | Yılmaz, A. | Rizvanov, A. | Şahin, Fikrettin

Article | 2013 | Applied Biochemistry and Biotechnology171 ( 7 ) , pp.1819 - 1831

The use of stem-cell-based therapies in regenerative medicine and in the treatment of disorders such as Parkinson, Alzheimer's disease, diabetes, spinal cord injuries, and cancer has been shown to be promising. Among all stem cells, mesenchymal stem cells (MSCs) were reported to have anti-apoptotic, immunomodulatory, and angiogenic effects which are attributed to the restorative capacity of these cells. Human tooth germ stem cells (HTGSCs) having mesenchymal stem cell characteristics have been proven to exert high proliferation and differentiation capacity. Unlike bone-marrow-derived MSCs, HTGSCs can be easily isolated, expanded, an . . .d cryopreserved, which makes them an alternative stem cell source. Regardless of their sources, the stem cells are exposed to physical and chemical stresses during cryopreservation, hindering their therapeutic capacity. Amelioration of the side effects of cryopreservation on MSCs seems to be a priority in order to maximize the therapeutic efficacy of these cells. In this study, we tested the effect of Pluronic 188 (F68) on HTGSCs during long-term cryopreservation and repeated freezing and defrosting cycles. Our data revealed that F68 has a protective role on survival and differentiation of HTGSCs in long-term cryopreservation. © 2013 Springer Science+Business Media New York Daha fazlası Daha az

Developing Novel Antimicrobial and Antiviral Textile Products

Iyigundogdu, Z.U. | Demir, O. | Asutay, A.B. | Şahin, Fikrettin

Article | 2017 | Applied Biochemistry and Biotechnology181 ( 3 ) , pp.1155 - 1166

In conjunction with an increasing public awareness of infectious diseases, the textile industry and scientists are developing hygienic fabrics by the addition of various antimicrobial and antiviral compounds. In the current study, sodium pentaborate pentahydrate and triclosan are applied to cotton fabrics in order to gain antimicrobial and antiviral properties for the first time. The antimicrobial activity of textiles treated with 3 % sodium pentaborate pentahydrate, 0.03 % triclosan, and 7 % Glucapon has been investigated against a broad range of microorganisms including bacteria, yeast, and fungi. Moreover, modified cotton fabrics . . . were tested against adenovirus type 5 and poliovirus type 1. According to the test results, the modified textile goods attained very good antimicrobial and antiviral properties. Thus, the results of the present study clearly suggest that sodium pentaborate pentahydrate and triclosan solution-treated textiles can be considered in the development of antimicrobial and antiviral textile finishes. © 2016, Springer Science+Business Media New York Daha fazlası Daha az

Magnesium supplementation and bone

Aydin, H.

Book Part | 2013 | Magnesium in Human Health and Disease , pp.149 - 157

[No abstract available]

Sodium Pentaborate Pentahydrate and Pluronic Containing Hydrogel Increases Cutaneous Wound Healing In Vitro and In Vivo

Doğan, A. | Demirci, S. | Çağlayan, A.B. | Kılıç, E. | Günal, M.Y. | Uslu, Ü. | Şahin, Fikrettin

Article | 2014 | Biological Trace Element Research162 ( 01.03.2020 ) , pp.72 - 79

After a disruption of skin integrity, the body produces an immediate response followed by a functional and comparable regeneration period, referred to as wound healing. Although normal wounds do not need much attention during the healing period, chronic (non-healing) wounds are the major challenge of current dermatological applications. Therefore, developing new, safe, and effective wound healing drugs has always been an attractive area of international research. In the current study, sodium pentaborate pentahydrate (NaB), pluronics (Plu; F68 and F127), and their combinations were investigated for their wound healing activities, usi . . .ng in vitro and in vivo approaches. The results revealed that NaB significantly increased migration capacity and superoxide dismutase activity in primary human fibroblasts. Combinations of optimized concentrations for pluronic block co-polymers further increased cell migration, and the messenger RNA (mRNA) expression levels of important growth factor and cytokines (vascular endothelial growth factor (VEGF), transforming growth factor beta (TGF-ß), and tumor necrosis factor alpha (TNF-?)). NaB containing hydrogel co-formulated with pluronics was also investigated for their wound healing activities using a full thickness wound model in rats. Macroscopic and histopathological analysis confirmed that wounds in combination gel-treated groups healed faster than those of control groups. NaB/Plu gel application was found to increase wound contraction and collagen deposition in the wound area. Therefore, our results suggest that NaB, and its pluronics combination, could be used in dermatological clinics and be a future solution for chronic wounds. However, further studies should be conducted to explore its exact action of mechanism and effects of this formulation on chronic wounds. © 2014, Springer Science+Business Media New York Daha fazlası Daha az

Gastric Metastasis in a Patient with Lobular Breast Carcinoma 6 Years After Diagnosis

Eren, O.O. | Ozturk, M.A. | Sonmez, O. | Aslan, E. | Ozkan, F. | Oyan, B.

Letter | 2014 | Journal of Gastrointestinal Cancer45 ( 4 ) , pp.504 - 505

[No abstract available]

Enzymatic Hydrolyzed Feather Peptide, a Welcoming Drug for Multiple-Antibiotic-Resistant Staphylococcus aureus: Structural Analysis and Characterization

Paul, T. | Mandal, A. | Mandal, S.M. | Ghosh, K. | Mandal, A.K. | Halder, S.K. | Mondal, K.C.

Article | 2015 | Applied Biochemistry and Biotechnology175 ( 7 ) , pp.3371 - 3386

This study aimed to explore the bactericidal activity of a feather-degraded active peptide against multiple-antibiotic-resistant (MAR) Staphylococcus aureus. An antibacterial peptide (ABP) was isolated from the chicken feathers containing fermented media of Paenibacillus woosongensis TKB2, a keratinolytic soil isolate. It was purified by HPLC, and its mass was found to be 4666.87 Da using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) spectroscopy. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of this peptide were 22.5 and 90 µg/ml, respectively. SEM study reve . . .aled the distorted cell wall of the test strain along with pore formation. The possible reason for bactericidal activity of the peptide is due to generation of reactive oxygen species (ROS), resulting in membrane damage and leakage of intracellular protein. Complete sequence of the peptide was predicted and retrieved from the sequence database of chicken feather keratin after in silico trypsin digestion using ExPASy tools. Further, net charge, hydrophobicity (77.7 %) and molecular modelling of the peptide were evaluated for better understanding of its mode of action. The hydrophobic region (17 to 27) of the peptide may facilitate for initial attachment on the bacterial membrane. The ABP exhibited no adverse effects on RBC membrane and HT-29 human cell line. This cytosafe peptide can be exploited as an effective therapeutic agent to combat Staphylococcal infections. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

A Novel Approach to Septal Perforation Repair: Septal Cartilage Cells Induce Chondrogenesis of hASCs In Vitro

Şafak, A.S. | Avşar Abdik, E. | Abdik, H. | Taşlı, P.N. | Şahin, Fikrettin

Article | 2019 | Applied Biochemistry and Biotechnology188 ( 4 ) , pp.942 - 951

The aim of this study was to investigate the effect of medium harvested from septal cartilage cells on chondrogenic differentiation of adipose stem cells (hASCs) and to compare/contrast its properties to those of a commonly used standard medium formulation in terms of induction and maintenance of chondrogenic hASCs. Differentiation was carried out under three different conditions: septal cartilage medium-SCM, chondrogenic differentiation medium-CM, and 50:50 mixture of CM/SCM. Mesenchymal stem cells (MSCs) markers were determined by flow cytometry. The cytotoxic and apoptotic effects were determined by MTS and Annexin V assay, respe . . .ctively. The differentiation status of the cells was confirmed by Alcian blue staining, and quantitative real-time flow cytometry showed that hASCs were positive for MSCs, negative for hematopoietic stem cells and endothelial cell surface markers. According to MTS analysis, the first condition was not toxic at any concentration tested. Annexin V assay revealed that the application of different concentrations of SCM did not result in any cell death. The Alcian blue and gene expression analyses showed that the cells in the SCM group underwent the highest cartilage cell formation. The observed increase in chondrogenesis may offer better treatment options for the cartilage defects seen in nasal septum perforation. © 2019, Springer Science+Business Media, LLC, part of Springer Nature Daha fazlası Daha az

Dose-dependent Effect of Boric Acid on Myogenic Differentiation of Human Adipose-derived Stem Cells (hADSCs)

Apdik, H. | Doğan, A. | Demirci, S. | Aydın, S. | Şahin, Fikrettin

Article | 2015 | Biological Trace Element Research165 ( 2 ) , pp.123 - 130

Boron, a vital micronutrient for plant metabolism, is not fully elucidated for embryonic and adult body development, and tissue regeneration. Although optimized amount of boron supplement has been shown to be essential for normal gestational development in zebrafish and frog and beneficial for bone regeneration in higher animals, effects of boron on myogenesis and myo-regeneration remains to be solved. In the current study, we investigated dose-dependent activity of boric acid on myogenic differentiation of human adipose-derived stem cells (hADSCs) using immunocytochemical, gene, and protein expression analysis. The results revealed . . . that while low- (81.9 µM) and high-dose (819.6 µM) boron treatment increased myogenic gene expression levels such as myosin heavy chain (MYH), MyoD, myogenin, and desmin at day 4 of differentiation, high-dose treatment decreased myogenic-related gene and protein levels at day 21 of differentiation, confirmed by immunocytochemical analysis. The findings of the study present not only an understanding of boron’s effect on myogenic differentiation but also an opportunity for the development of scaffolds to be used in skeletal tissue engineering and supplements for embryonic muscle growth. However, fine dose tuning and treatment period arranging are highly warranted as boron treatment over required concentrations and time might result in detrimental outcomes to myogenesis and myo-regeneration. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Characterization and Differentiation of Stem Cells Isolated from Human Newborn Foreskin Tissue

Somuncu, Ö.S. | Taşlı, P.N. | Şişli, H.B. | Somuncu, S. | Şahin, Fikrettin

Article | 2015 | Applied Biochemistry and Biotechnology177 ( 5 ) , pp.1040 - 1054

Circumcision is described as a cultural, medical, and religious process which states surgical removal of the foreskin either partly or fully. Cells isolated from the circumcised tissues are referred as foreskin cells. They have been thought as feeder cell lines for embryonic stem cells. Their fibroblastic properties were also utilized for several experiments. The waste tissues that remain after the circumcision thought to have stem cell properties. Therefore, there have been very few attempts to expose their stem cell properties without turning them into induced pluripotent stem cells. Although stem cell isolation from prepuce and t . . .heir mesenchymal multilineage differentiation potential have been presented many times in the literature, the current study explored hematopoietical phenotype of newborn foreskin stem cells for the first time. According to the results, human newborn foreskin stem cells (hnFSSCs) were identified by their capability to turn into all three germ layer cell types under in vitro conditions. In addition, these cells have exhibited a stable phenotype and have remained as a monolayer in vitro. hnFSSCs suggested to carry different treatment potentials for bone damages, cartilage problems, nerve damages, lesion formations, and other diseases that are derive from mesodermal, endodermal, and ectodermal origins. Owing to the location of the tissue in the body and differentiation capabilities of hnFSSCs, these cells can be considered as easily obtainable and utilizable even better than the other stem cell sources. In addition, hnFSSCs offers a great potential for tissue engineering approaches due to exhibiting embryonic stem cell-like characteristics, not having any ethical issues, and teratoma induction as in embryonic stem cell applications. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

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