Antihyperlipidemic effect of Cyclocarya paliurus (Batal.) Iljinskaja extract and inhibition of apolipoprotein B48 overproduction in hyperlipidemic mice.
Cyclocarya paliurus (CP) Batal., the sole species in its genus, is a native plant to China. As a traditional Chinese folk medicine, the tree leaves have been widely used for the treatment of metabolic disorders, including hyperlipidemia, obesity, diabetes and hypertension.
The study aimed to evaluate the antihyperlipidemic effect of CP ethanol extract, as well as its inhibitory activity on apolipoproteinB48 (apoB48), in normal and hyperlipidemic mice.
The antihyperlipidemic effect of CP was evaluated in hyperlipidemic mice induced by high-fat diet for 4 weeks. CP ethanol extract (0.37, 0.75 and 1.5g/kg/day) was orally administrated once daily. Lipids and antioxidant profiles, including total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px), together with the indices of hepatic and renal functions were examined. RT-qPCR and western blotting were used to analysis the expression levels of tumor necrosis factor (TNF-α), total- and triglyceride-rich apoB48 (TRL-apoB48), as well as the phosphorylation of the mitogen-activatein kinase (MAPK).
CP as well as simvastatin remarkably lowered the levels of TC, TG, LDL-C and MDA, and at the same time, elevated the HDL-C, SOD and GSH-Px in high-fat diet mice. It also decreased the serum concentration of total- and TRL-apoB48 in the fasting state. CP inhibited TNF-α expression and phosphorylation level of MAPK. Furthermore, the HE staining of liver and kidney, together with hepatic and renal function analysis showed hepato- and renoprotective activities of CP.
These results suggested that CP possesses beneficial potentials for use in treating hyperlipidemia and the underlying lipid-lowering mechanism might associate with a down-regulation of the intestinal-associated lipoprotein apoB48, which may provide evidence about its practical application for treating hyperlipidemia and its complications.
Ma Y
，Jiang C
，Yao N
，Li Y
，Wang Q
，Fang S
，Shang X
，Zhao M
，Che C
，Ni Y
，Zhang J
，Yin Z
... -
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Cholesterol-lowering effects and potential mechanisms of different polar extracts from Cyclocarya paliurus leave in hyperlipidemic mice.
Cyclocarya paliurus Batal., native only to China, is widely consumed as a Chinese traditional folk medicine for the prevention and treatment of hyperlipidemia, obesity, and diabetes. The aim of the study is to investigate the cholesterol-lowering effect and potential mechanisms of different polar extracts from Cyclocarya paliurus leaves in mice fed with high-fat-diet.
Cyclocarya paliurus leaves extracts were orally administered to diet-induced hyperlipidemic mice for 4 weeks. Simvastatin was used as a positive control. Body weight, food intake, histopathology of liver and adipose tissues, hepatic and renal function indices, lipid profiles in the serum and liver were evaluated. Total bile acid concentrations of the liver and feces were also measured. Furthermore, the activities and mRNA expression of cholesterol metabolism-related enzymes including 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, cholesterol 7α-hydroxylase (CYP7A1) and acyl-CoA cholesterol acyltransferase 2 (ACAT2) in the livers of the mice were analyzed. LC-MS detection was performed to identify the components in the active fraction of Cyclocarya paliurus extracts.
Different Cyclocarya paliurus polar extracts, especially ChE reduced the levels of serum total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C) and hepatic TC and TG, enhanced the level of serum high-density lipoprotein cholesterol (HDL-C), restored hepatic and renal function indices and histomorphology. HMG-CoA reductase activity and mRNA expression were decreased, while CYP7A1 activity and mRNA expression as well as the level of fecal and hepatic bile acid were increased by ChE. LC-MS analysis of ChE revealed the presence of six main triterpenoids, which might be responsible for its antihyperlipidemic bioactivity.
Evidently ChE possesses the best antihyperlipidemic activity, and the cholesterol-lowering effect is at least partly attributed to its role in promoting the conversion of cholesterol into bile acids by upgrading the activity and mRNA expression of CYP7A1 and inhibiting those of HMG-CoA reductase to lower the cholesterol biosynthesis.
Jiang C
，Wang Q
，Wei Y
，Yao N
，Wu Z
，Ma Y
，Lin Z
，Zhao M
，Che C
，Yao X
，Zhang J
，Yin Z
... -
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Antihyperglycemic, antihyperlipidemic and antioxidant effects of ethanol and aqueous extracts of Cyclocarya paliurus leaves in type 2 diabetic rats.
Cyclocarya paliurus (CP) Batal., the sole species in its genus and native to China, is a herbal tea, which has been traditionally used in the folk medicine for the treatment of diabetes and hyperlipidemia in China. To evaluate the antihyperglycemic, antihyperlipidemic and antioxidant effects of ethanol and aqueous extracts from CP in high fat diet (HFD) and streptozotocin (STZ) induced diabetic rats.
Type 2 diabetes was induced in 140 rats by feeding with HFD and high sugar water for 6 weeks and single injection of STZ (30mg/kg, intraperitoneally). CP ethanol extract (CPEE) and aqueous extract (CPAE) at three doses at 2, 4 and 8 g/kg/day were orally administered once daily for four weeks. Blood glucose, serum insulin, oral glucose tolerance test (OGTT), insulin tolerance test (ITT), free fatty acid (FFA), total cholesterol (TC), triglyceride (TG), low density lipoprotein-cholesterol (LDL-C), high density lipoprotein-cholesterol (HDL-C), malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), blood urea nitrogen (BUN), creatinine (CREA) and glycated serum protein (GSP) were examined. The content of total flavonoids and polysaccharides in CPEE and CPAE were assayed by ultraviolet spectrophotometry.
Both CPEE and CPAE increased OGTT, ITT, HDL-C, SOD and GSH-Px, while they decreased FFA, TC, TG, LDL-C, MDA, BUN, CREA and GSP. The amount of total flavonoids was found in CPEE (30.41 mg/g extract), followed by CPAE (6.75 mg/g extract). Similarly, the polysaccharides content (4.13 mg/g extract) was observed in CPAE, while absent in CPEE.
The results suggested that CPEE and CPAE exhibited the similar antihyperglycemic, antihyperlipidemic and antioxidant effects in type 2 diabetic rats, and there were no significant differences between these two extracts.
Wang Q
，Jiang C
，Fang S
，Wang J
，Ji Y
，Shang X
，Ni Y
，Yin Z
，Zhang J
... -
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Effect of pu-erh tea on body fat and lipid profiles in rats with diet-induced obesity.
The antiobesity and antihyperlipidaemic effects of pu-erh tea in rats with high fat diet (HFD)-induced obesity were investigated. Male Sprague-Dawley rats were randomly divided into five groups and fed varying diets for an 8-week period: control diet, HFD, and HFD supplemented with low, moderate or high doses of pu-erh tea extract (0.5 g, 2 g and 4 g/kg BW/day, respectively). Pu-erh tea significantly reduced the total body weight and the weight of various adipose pads. Pu-erh tea administration also significantly lowered plasma total cholesterol, triglyceride concentrations and low-density lipoprotein-cholesterol levels in rats with HFD-induced obesity, but did not affect high-density lipoprotein-cholesterol levels. Moreover, pu-erh tea significantly increased lipoprotein lipase, hepatic lipase and hormone-sensitive lipase activities in epididymal fat tissue in rats with HFD-induced obesity. Analysis of real-time reverse transcription-polymerase chain reaction results indicated that pu-erh tea significantly enhanced mRNA levels of hormone-sensitive lipase in rats with HFD-induced obesity. These results suggest that pu-erh tea attenuated visceral fat accumulation and improved hyperlipidemia in a rat model of HFD-induced obesity.
Cao ZH
，Gu DH
，Lin QY
，Xu ZQ
，Huang QC
，Rao H
，Liu EW
，Jia JJ
，Ge CR
... -
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