Özet:

Objectives: Dietary high fructose consumption which is closely associated with endothelial dysfunction via insülin resistance has recently increased in developed countries.Insulin resistance has a promoter effect on many meta-bolic disorders such as syndrome X, polycystic ovary syn-drome, Type 2 diabetes mellitus etc. Our aim in this study is to understand the impact of increased fructose intake on metabolisms of glucose, insulin and endothelial dys-function by measuring nitric oxide (NO) and endothelin-1(ET-1) levels in hepatic tissue which is crucial in fructose metabolism. Materials and Methods: We designed an animal study to understand increased fructose intake on hepatic en-dothelium. Twenty adult male albino rats were divided into two groups; the study group (group 1, n=10) received isocaloric fructose enriched diet (fructose-fed rats, con-taining 18.3% protein, 60.3% fructose and 5.2% fat) while the control group received purifi ed regular chow (group 2,n=10) for 2 weeks. After feeding period, blood and hepatictissue samples were collected and glucose, insulin, NO and ET-1 levels were analysed. Results: We found increased fasting glucose and insülin levels and impaired glucose tolerance in fructose fed rats. Higher NO and lower ET–1 levels were also detected in hepatic tissue samples of the group 1. Conclusion: Increased fructose consumption has delete- rious effects on glucose tolerance, insulin resistance and may cause to endothelial dysfunction. Key words: Fructose consumption, endothelial dysfunc-tion, nitric oxide, endothelin-1, liver.

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