Polygonum multiflorum is widely used in the prevention and treatment of hyperlipidemia in traditional Chinese Medicine. In this study, the effects and relevant mechanisms of lipid-regulation by raw Polygonum multiflorum (RPM) were investigated. The results indicated that the basal plasma lipids, such as low-density lipoprotein cholesterol (LDL-C), total cholesterol (TC), and triglycerides (TG), were significantly decreased in RPM treatment groups compared with the model group, especially in the RPM high dose group. The key enzymes involved in lipid metabolism, 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR), fatty acid synthase (FAS) and acetyl-CoA carboxylase (ACC) in plasma were generally reduced after oral administration, which was consistent with the transcription levels of their target genes. In addition, the hepatotoxicity of RPM was investigated, and RPM showed slightly less liver injury than that induced by simvastatin. Histological analysis indicated that the fat vacuoles and steatosis in hepatocytes were relieved after oral administration of RPM extract at a high dose of 16.2 g/kg, which was more obvious than that induced by simvastatin. These results revealed that RPM exerted its lipid-lowering effect by regulating the expression of related genes, and performed better than simvastatin in the treatment of hyperlipidemia.
Key words raw Polygonum multiflorum; hyperlipidemia; lipid-lowering; hepatotoxicityHyperlipidemia is a common metabolic syndrome characterized by increased total cholesterol (TC), triglycerides (TG), and low-density lipoprotein cholesterol (LDL-C) and decreased high-density lipoprotein cholesterol (HDL-C) levels, 1) which facilitate endothelial dysfunction and atherogenesis, the major risk factor for cardiovascular disease.2) Statins are commonly used in clinical treatment as first-line lipid-lowering drugs, especially in the treatment of hyperlipidemia. They act to suppress the activities of 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) and thus affect the formation of mevalonic acid, the rate-limiting step in the biosynthesis of cholesterol, 3) but this treatment is often accompanied by adverse reactions such as gastrointestinal tract issues, myopathy and hepatotoxicity. 4,5) Traditional Chinese Medicine (TCM) is a healthcare-focused medical system based on more than 3000 years of continuous practice experience, and therefore has its own advantages and characteristics in early intervention and personalized treatment. Some Chinese medicinal herbs have shown lipid-lowering effects by reducing the absorption of exogenous lipids and the synthesis of endogenous lipids, and also by facilitating the transportation, metabolism and excretion of lipids.
6)TCM performs multi-target network regulation based on the function of the whole body; between its characteristic good efficiency and low toxicity, TCM has received extensive attention all over the world. There are various Chinese medicinal herbs clinically prescribed to cure hyperlipidemia. Among these herbs, Polygonum multiflorum ranked as...