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Articles by Oksana Sytar
Total Records ( 2 ) for Oksana Sytar
  Sahar Y. Al-Okbi , Doha A. Mohamed , Thanaa E. Hamed , Ahmed M.M. Gabr , Hoda B. Mabrok , Shaimaa E. Mohammed and Oksana Sytar
  Background and Objective: Non-alcoholic fatty liver is recognized as the hepatic component of metabolic syndrome that accused for induction of cardiovascular and chronic liver diseases. This research evaluated the protective effect of two varieties of buckwheat seeds; Rubra and Karadag and their calli prepared by biotechnology towards non-alcoholic fatty liver in rat. Materials and Methods: Total phenolics, flavonoids, flavonols and DPPH free radical scavenging activity of buckwheat seeds and calli were assessed. Metabolic syndrome together with non-alcoholic fatty liver (MF) was induced by maintaining rats on high fructose diet. Daily oral dose of buckwheat seeds and calli (40 mg/rat) were given to 4 different groups during MF induction and compared to MF control rats and control group fed on balanced diet (NC). The experiment continued for 5 weeks. Results: In vitro free radical scavenging activities, total phenolic and flavonols of the calli were shown to be higher than the seeds. In vivo study showed significant dyslipidemia, significant increase in malondialdehyde, tumor necrosis factor-alpha, transaminase activity and liver fats in MF control group compared to NC. The relative gene expression of transforming growth factor beta-1 (TGF-β1) and TGF-β1 receptors I in liver as fibrogenic markers was significantly up-regulated in MF control group compared to NC. Treatment with different buckwheat forms produced improvement of the various determined plasma parameters and liver fats with variable degrees. Also, mRNA expression of TGF-β1 and TGF-β1 receptors I genes were significantly down-regulated in rats' liver on treatment with buckwheat seeds and calli. Conclusion: Buckwheat seeds and calli showed improvement of fatty liver and fibrogenic biomarkers.
  Hoda Bakr Mabrok , Doha Abdou Mohamed , Oksana Sytar and Iryna Smetanska
  Background and Objective: Anthocyanin is responsible for the red color of apple. Ultraviolet light plays a key role in activating the genes responsible for anthocyanin biosynthesis. However, the most important concern is using UV light irradiation on fruit to increase anthocyanins level and its nutritional quality. In this study, the accumulation of anthocyanin in green apple using UV-B and UV-C was investigated and its biological influence was evaluated in rats. Material and Method: Green Golden delicious apples were irradiated with doses of UV-C and UV-B light for a period of 3 h/day each for 3 days. Two Groups of rats were fed on balanced diet or balanced diet supplemented with 10% apple exposure to UV (AP-UV) for a month. Results: The HPTLC and spectrophotometric determination of anthocyanin revealed that color development was significantly increased by 90% in treated apple compared to the control apples. Histological difference was observed between the 2 groups. Plasma levels of uric acid, the activity of transaminases (ALT and AST) as well as malondialdehyde (MDA) were significantly elevated in AP-UV rats. Plasma total cholesterol, triglycerides and creatinine level did not differ among the 2 groups. Liver MDA and catalase levels were eminent in AP-UV rats compared to control. Gene expression of selected inflammatory cytokines (TNF-α, IL-6 and IL-1β) was significantly up-regulated in liver of AP-UV rats in comparison to control rats. Conclusion: The result revealed that there is a health-hazard linked to feeding rats on diet containing irradiated-apple with UV-B and UV-C, which represented by body weight reduction, inflammation development, liver function and oxidative stress elevation.
 
 
 
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