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Hyperlipidemia is one of the risk factors for atherosclerosis. This study was conducted to investigate the cholesterol-lowering and antiatherosclerotic effect of Mori radicis cortex-ethanol extracts (MRC-EE) in hypercholesterolemia produced by feeding on high-cholesterol diet in rabbits. Male New Zealand White rabbits were fed on only high-fat fed diet containing 1% cholesterol and 2% corn oil for 2 weeks, and then MRC-EE (1% or 3%) or lovastatin (0.002%) were added to the diet for additional 8 weeks. The levels of blood cholesterol, low-density lipoproteins (LDL) and high-density lipoproteins (HDL) were greatly increased by 2-week feeding on the high-fat diet, compared with those of animals fed on normal diet. Blood concentrations of cholesterol, LDL and triglycerides further increased during additional 8-week feeding on high-cholesterol diet alone, in contrast to significant decrease in HDL level. In comparison, the levels of cholesterol and LDL were reduced by lavastatin and MRC-EE, in addition to less-severe decrease in HDL contents. The levels of alanine transaminase (ALT) and aspartate transaminase (AST) significantly increased in lovastatin-treated rabbits, but not in MRC-EE-fed animals. In addition, MRC-EE (3%) lowered lipid deposition in hepatocytes, showing restricted distribution of foamy hepatocytes, in constrast to hepatic centrilobular congestion and hepatotoxicity caused by lovastatin. The thick atheromatous plaques (mean score 2.75) on the aortic wall of rabbits fed on high-fat diet were markedly attenuated by MRC-EE (3%) or lovastatin, leading to the decreases in athrosclerosis indices to 2.0. These results suggest that MRC-EE (3%) exerts antiatherosclerotic effect by reducing atherosclerosis index without hepatotoxicity.

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UCI(KEPA) : I410-ECN-0101-2009-510-016362414