Browsing by Author "Karahan S."

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Evaluation of melamine and cyanuric acid cytotoxicity: An in vitro study on l929 fibroblasts and cho cell line
(2020-01-01) Melekoğlu A.; Ekici H.; Arat E.; Karahan S.
Melamine and its metabolites pose health concern as they are used in various industrial products including feed and drugs. There are a limited number of studies on melamine and cyanuric acid cytotoxicity and cellular damage without a certain conclusion. The present study aimed to evaluate melamine, cyanuric acid and its combined cytotoxic effects using 3-(4.5dimethylthiazol-2-yl) methyl thiazole tetrazolium (MTT) bromide test. The study also evaluated apoptotic and necrotic effect using a double staining method of Hoechst 33342 and propidium iodide. Melamine, cyanuric acid and their combination (1:1) were applied to L929 fibroblasts and Chinese hamster ovary (CHO) cells at various concentrations (1000 µg/mL, 500 µg/mL, 250 µg/mL, 125 µg/mL and 62.5 µg/mL). At the highest concentration (1000 µg/mL), the cell viability dropped down approximately to 50% both in CHO cells and L929 cells. Melamine, cyanuric acid and their mixture caused cytotoxicity in CHO cells and L929 fibroblasts in dose-dependent manner. Cell death occurred through both apoptosis and mainly necrosis. Both cell types were more sensitive to the mixture of melamine and cyanuric acid and, furthermore, CHO cells were more sensitive than L929 fibroblasts. As a result, melamine, cyanuric acid and their combination caused cytotoxicity in CHO cells and L929 fibroblasts. Further studies should be conducted in different cell lines. These studies should also aim to reveal the mechanism of cytotoxicity and related pathways.
The Comparative Efficacy of Conventional Short-Stretch Multilayer Bandages and Velcro Adjustable Compression Wraps in Active Treatment Phase of Patients with Lower Limb Lymphedema
(2021-06-01) Borman P.; Koyuncu E.G.; Yaman A.; Calp E.; Koç F.; Sargut R.; Karahan S.
Background: Compression is the most important component of complete decongestive therapy (CDT), but there is no standard best method for applying compression. The aim of this study was to evaluate the comparative efficacy of conventional multilayer short-stretch bandaging, and a velcro adjustable compression wrap with regard to volume reduction, ultrasonographic measurements, functional-status, and quality of life (QoL) in the active CDT period of patients with lower limb lymphedema. Methods and Results: The demographic and clinical variables of lower limb lymphedema patients were recorded. All patients received skin care education, manual lymphatic drainage, and supervised lyphedema exercises, and were randomly allocated to Group1 (multilayer short-stretch bandaging-Rosidal-K®) or to Group 2 (adjustable-compression-velcro-wrap-Circaid Reduction-kit®) for a duration of 3 weeks with 15 sessions. Limb volumes were assessed by perometer. Ultrasonographic measurements included subcutaneous soft tissue thickness. The functional disability and QoL were evaluated by the Lower Extremity Functional Scale and LYMQOL-Leg (Lymphedema Quality of Life Questionnaire-Leg), respectively, at baseline, after CDT, and at first-month follow-up. Thirty-six patients (10 male and 26 female) with mean age of 51.6 ± 11.7 years were included. Fourteen patients had primary and 22 patients had secondary lymphedema. The median duration of lymphedema was 68 months. Significant improvements in volumes and ultrasonographic measurments were observed in both groups at the end of therapies, and improvements sustained up to a month. Appearance, symptoms, and overall QoL-subscores were improved only in Group 2. Conclusion: In conclusion, adjustable compression velcro-wrap performed as a part of CDT can greatly reduce the volume similiar to conventional multilayer bandages, as well as improve the QoL. It can be a comfortable alternative to the conventional multilayer bandages in the active treatment phase of the CDT.