Bulunan: 31 Adet 0.001 sn
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]

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

Etiology of hypopituitarism in tertiary care institutions in Turkish population: Analysis of 773 patients from pituitary study group database

F. Tanriverdi | H.S. Dokmetas | N. Kebapci | F. Kilicli | H. Atmaca | S. Yarman | T. Erbas

Article | 2014 | Endocrine47 ( 1 ) , pp.198 - 205

Hypopituitarism in adult life is commonly acquired and the main causes are known as pituitary tumors and/or their treatments. Since there are new insights into the etiology of hypopituitarism and presence of differences in various populations, more studies regarding causes of hypopituitarism are needed to be done in different ethnic groups with sufficient number of patients. Therefore, we performed a multi-center database study in Turkish population investigating the etiology of hypopituitarism in 773 patients in tertiary care institutions. The study was designed and coordinated by the Pituitary Study Group of SEMT (The Society of E . . .ndocrinology and Metabolism of Turkey). Nineteen tertiary reference centers (14 university hospitals and 5 training hospitals) from the different regions of Turkey participated in the study. It is a cross-sectional database study, and the data were recorded for 18 months. We mainly classified the causes of hypopituitarism as pituitary tumors (due to direct effects of the pituitary tumors and/or their treatments), extra-pituitary tumors and non-tumoral causes. Mean age of 773 patients (49.8 % male, 50.2 % female) was 43.9 ± 16.1 years (range 16-84 years). The most common etiology of pituitary dysfunction was due to non-tumoral causes (49.2 %) among all patients. However, when we analyze the causes according to gender, the most common etiology in males was pituitary tumors, but the most common etiology in females was non-tumoral causes. According to the subgroup analysis of the causes of hypopituitarism in all patients, the most common four causes of hypopituitarism which have frequencies over 10 % were as follows: non-secretory pituitary adenomas, Sheehan's syndrome, lactotroph adenomas and idiopathic. With regard to the type of hormonal deficiencies; FSH/LH deficiency was the most common hormonal deficit (84.9 % of the patients). In 33.8 % of the patients, 4 anterior pituitary hormone deficiencies (FSH/LH, ACTH, TSH, and GH) were present. Among all patients, the most frequent cause of hypopituitarism was non-secretory pituitary adenomas. However, in female patients, present study clearly demonstrates that Sheehan's syndrome is still one of the most important causes of hypopituitarism in Turkish population. Further, population-based prospective studies need to be done to understand the prevalence and incidence of the causes of hypopituitarism in different countries. © 2013 Springer Science+Business Media Daha fazlası Daha az

Evaluation the Weekly Intake of Some Wild Edible Indigenous Mushrooms Collected in Different Regions in Tunceli, Turkey

Alp, H. | Ince, M. | Ince, O.K. | Onal, A.

Article | 2019 | Biological Trace Element Research , pp.198 - 205

The quantity of some essential and non-essential elements of wild edible mushroom samples collected from Tunceli Province of Turkey was determined by using flame and electrothermal atomic absorption spectrometer after microwave digestion. The method accuracy was corrected using standard reference material (NIST SRM 1547-Peach Leaves). The essential element concentrations of analyzed mushroom samples were determined in the range of 0.036–0.563 mg kg-1 for calcium, 1.28–2.55 mg kg-1 for magnesium, 0.054–0.188 mg kg-1 for sodium, 1.00–4.57 mg kg-1 for copper, 212–480 mg kg-1 for iron, and 75–151 mg kg-1 for zinc but cobalt and chromium . . . were not detected. Based on results, there were statistically significant differences between the element contents of analyzed mushroom species. Consequently, according to this study results, the weekly intake and target hazard quotient values of the elements show that the consumption of these mushrooms does not threaten human health. [Figure not available: see fulltext.]. © 2019, Springer Science+Business Media, LLC, part of Springer Nature Daha fazlası Daha az

Boron Content of Some Foods Consumed in Istanbul, Turkey

Kuru, R. | Yilmaz, S. | Tasli, P.N. | Yarat, A. | Şahin, Fikrettin

Article | 2019 | Biological Trace Element Research187 ( 1 ) , pp.198 - 205

The boron content was determined in 42 different foods consumed in Istanbul, Turkey. Eleven species of fruit, ten species of vegetable, eight species of food of animal origin, four species of grain, two species of nuts, two species of legume, and five other kinds of foods were included to this study. They were analyzed by two methods: Inductively coupled plasma mass spectrometry (ICP-MS) technique and carminic acid assay, and the results of two methods were also compared. Boron concentration in foods ranged between 0.06–37.2 mg/kg. Nuts had the highest boron content while foods of animal origin had the lowest. A strong correlation w . . .as found between the results of the carminic acid assay and the ICP-MS technique (p = 0.0001, Pearson correlation coefficient: r = 0.956). Bland Altman analysis also supported this correlation. ICP-MS is one of the most common, reliable, and powerful method for boron determination. The results of our study show that spectrophotometric carminic acid assay can provide similar results to ICP-MS, and the boron content in food materials can be also determined by spectrophotometric method. © 2018, Springer Science+Business Media, LLC, part of Springer Nature Daha fazlası Daha az

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

Magnesium supplementation and bone

Aydin, H.

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

[No abstract available]

Suppressor Effects of Sodium Pentaborate Pentahydrate and Pluronic F68 on Adipogenic Differentiation and Fat Accumulation

Yilmaz, A.B. | Tapsin, S. | Elbasan, E.B. | Kayhan, H.D. | Şahin, Fikrettin | Turkel, N.

Article | 2020 | Biological Trace Element Research193 ( 2 ) , pp.390 - 399

Obesity is a major public health problem worldwide and a risk factor for certain diseases, including cardiovascular disease, diabetes, cancer, and depression. Unfortunately, currently available anti-obesity drugs have failed in the long-term maintenance of weight control. It has been a challenge to design novel drugs that could potentially treat obesity or prevent uncontrolled weight-gain which lies underneath the pathology of obesity. Since obesity in a way is a consequence of the accumulating new mature adipocytes from undifferentiated precursors which is a process also termed as adipogenesis, drugs that might control adipogenesis . . . could be beneficial for the treatment of obesity. In the current study, combined effect of sodium pentaborate pentahydrate (NaB) and pluronic F68 on adipogenic differentiation was examined by administering various combinations of the two agents to human adipose-derived stem cells (hADSCs) in in vitro. Immunocytochemistry and quantitative RT-PCR were performed to evaluate the levels of adipogenesis-promoting genes such as peroxisome proliferator-activated receptor-? (PPAR?), fatty acid binding protein (FABP4), and adiponectin. Results indicated that expressions of all these three genes were restrained. Furthermore, Oil Red O staining revealed that lipid vesicle formation was reduced in hADSCs treated with differentiation medium containing NaB/F68 combination. Finally, expression levels of Hippo pathway kinases Lats2, MST1, and scaffold protein Sav1 were reduced in these cells, suggesting a possible link between Hippo pathway-dependent downregulation of PPAR? and the NaB/F68 treatment. Herein, we showed that combination of NaB and F68 curtails adipocyte differentiation by inhibiting the adipogenic transcriptional program leading to a decrease in lipid accumulation in adipocytes even at very low doses, thereby uncovered a striking opportunity to use this combination in obesity treatment. © 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

Boron and Poloxamer (F68 and F127) Containing Hydrogel Formulation for Burn Wound Healing

Demirci, S. | Doğan, A. | Karakuş, E. | Halıcı, Z. | Topçu, A. | Demirci, E. | Şahin, Fikrettin

Article | 2015 | Biological Trace Element Research168 ( 1 ) , pp.169 - 180

Burn injuries, the most common and destructive forms of wounds, are generally accompanied with life-threatening infections, inflammation, reduced angiogenesis, inadequate extracellular matrix production, and lack of growth factor stimulation. In the current study, a new antimicrobial carbopol-based hydrogel formulated with boron and pluronic block copolymers was evaluated for its healing activity using in vitro cell culture techniques and an experimental burn model. Cell viability, gene expression, and wound healing assays showed that gel formulation increased wound healing potential. In vitro tube-like structure formation and histo . . .pathological examinations revealed that gel not only increased wound closure by fibroblastic cell activity, but also induced vascularization process. Moreover, gel formulation exerted remarkable antimicrobial effects against bacteria, yeast, and fungi. Migration, angiogenesis, and contraction-related protein expressions including collagen, ?-smooth muscle actin, transforming growth factor-ß1, vimentin, and vascular endothelial growth factor were considerably enhanced in gel-treated groups. Macrophage-specific antigen showed an oscillating expression at the burn wounds, indicating the role of initial macrophage migration to the wound site and reduced inflammation phase. This is the first study indicating that boron containing hydrogel is able to heal burn wounds effectively. The formulation promoted burn wound healing via complex mechanisms including stimulation of cell migration, growth factor expression, inflammatory response, and vascularization. © 2015, 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

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