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—Intranasal administration of lysine- and arginine-containing peptides Lys-Lys-Arg-Arg-Pro-Gly-Pro and Lys-Arg-Arg-Lys-Pro-Gly-Pro was performed daily at a single dose of 100 µg/kg for 7 days on laboratory rats with experimental metabolic syndrome and endothelial dysfunction. Metabolic syndrome was modeled by a high-calorie diet maintained throughout the experimental period, while endothelial dysfunction was simulated by daily intraperitoneal injection of L–NAME at a single dose of 10 mg/kg for 5 days. It was found that these peptides had anticlotting, hypoglycemic, and lipid-lowering effects and reduced body weight gain in experimental rats. They affected both primary (vascular-platelet) hemostasis, decreasing platelet aggregation, and all elements of plasma hemostasis by increasing anticoagulant, fibrin-depolymerizing, and enzymatic fibrinolytic activities as well as anti-fibrin-stabilizing properties of plasma and reducing the concentration of fibrinogen in it. At the same time, the studied peptides diminished the content of total cholesterol, low-density lipoprotein cholesterol, and triglycerides, while increasing the concentration of high-density lipoprotein cholesterol. These effects were observed 20 h after the last administration of peptides and persisted, although to a lesser extent, 7 days (168 h) after treatment withdrawal. In this regard, the prolonged action can be considered for both glyproline peptides containing lysine and arginine aminoacid residues in their structure and their ability to protect the body from the development of metabolic diseases and endothelial dysfunction. The maximum effects were provided by the Lys-Arg-Arg-Lys-Pro-Gly-Pro peptide, which may be associated with its structural features.
Moscow University Biological Sciences Bulletin – Springer Journals
Published: May 18, 2021
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