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Zebra blenny protein hydrolysates as a source of bioactive peptides with prevention effect against oxidative dysfunctions and DNA damage in heart tissues of rats fed a cholesterol-rich diet.
Food Research International 2017 October
High-cholesterol diet (HCD) is suspected to produce in excess free radicals having adverse effects on human health and causing atherosclerosis damage in heart tissues. In our study, the effects of zebra blenny protein hydrolysates (ZBPHs) were investigated on cardiac oxidant/antioxidant status as well as DNA damage and histopathological disorders in rats, fed with a hypercholesterolemic diet. The molecular weight distribution of the hydrolysates was determined by size exclusion chromatography, which analyzed a representative hydrolysate type with a weight range of 3-20kDa. ZBPHs effectively protected heart genomic DNA against oxidative damage induced by Fenton's reagent. HCD promoted oxidative stress with a rise in serum aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) activities and thiobarbituric acid reactive substance (TBARS), advanced oxidation protein product (AOPP) and hydrogen peroxide (H2O2) levels in heart tissues. An increase in glutathione peroxidase (GPx), superoxide dismutase (SOD), and catalase (CAT) activities as well as a fall in ATPase activities and glutathione (GSH) level was also noted in heart of hypercholesterolemic rats. Treatment with ZBPHs ameliorated the biochemical parameters cited above. In addition, pre-treatment with ZBPHs prevented DNA fragmentation. The histopathological findings confirmed the biochemical results and the potential antioxidant activities of ZBPHs which can help the cure and management of cardiovascular diseases induced by high-cholesterol levels.
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