Effect of Cortisone on Lipid Metabolism of Plasma, Liver and Aorta and on Retrogression of Atherosclerosis in the Rabbit

1956 ◽  
Vol 187 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Abraham Dury
Keyword(s):  
Cholesterol Metabolism ◽  
Specific Activity ◽  
Plasma Cholesterol ◽  
Plasma Lipid ◽  
Plasma Phospholipid ◽  
Phospholipid Metabolism ◽  
Metabolic Effects ◽  
High Cholesterol Diet ◽  
High Cholesterol ◽  
Lipid Distribution

This study was made to assess the relative metabolic effects of cortisone in rabbits on a normal or high cholesterol diet. Cortisone was administered daily for 14 days to normal and atherosclerotic rabbits. Determinations were made of lipid distribution and phospholipid metabolism of plasma, liver and aorta of these groups compared with that of untreated, normal and cholesterol-fed animals. Aortas were examined and judged for severity of atherosclerosis. The most notable effects of administered cortisone on lipid distribution were the extent of mobilized neutral fat to the liver and the elevated level in the plasma. Cholesterol metabolism appeared to be differently affected by cortisone administration to animals on the two types of diet; in cholesterol-fed rabbits the plasma ester cholesterol was significantly depressed while in normal animals cortisone appeared to have promoted a hypercholesterolemia. Plasma lipid interrelationships of cholesterol-fed, cortisone injected rabbits were more like normal and different from that of untreated, atherosclerotic rabbits. The radioactivity data showed that plasma phospholipid turnover rate was increased while specific activity of aortic phospholipid was decreased in rabbits administered cortisone compared with that of the untreated groups. The Sf 12–400 classes of serum lipoproteins were increased in amount in normal and cholesterol-fed rabbits subsequent to administered cortisone. The metabolic findings are discussed with regard to their association with a marked degree of retrogression of the severity of atherosclerosis observed in the cortisone-treated rabbits.

scholarly journals Stachys sieboldii Miq. Root Attenuates Weight Gain and Dyslipidemia in Rats on a High-Fat and High-Cholesterol Diet

Nutrients ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2063 ◽  
Author(s):  
Jennifer K. Lee ◽  
Jae-Joon Lee ◽  
Yeon-Kyoung Kim ◽  
Youngseung Lee ◽  
Jung-Heun Ha
Keyword(s):  
Adipose Tissue ◽  
Cholesterol Metabolism ◽  
Atherogenic Index ◽  
Lipid Lowering ◽  
Cardiac Risk Factor ◽  
Epididymal Adipose Tissue ◽  
High Cholesterol Diet ◽  
High Cholesterol ◽  
High Fat ◽  
Stachys Sieboldii

This study aimed at investigating the anti-obesity and anti-dyslipidemic effects of Stachys sieboldii Miq. root (SS) powder in rats following a high-fat and high-cholesterol (HFC) diet for 6 weeks. Thirty-two Sprague–Dawley rats were fed one of the following diets: a regular diet (RD), HFC, HFC supplemented with 3% SS (HFC + 3SS) or HFC supplemented with 5% SS (HFC + 5SS). Following an HFC diet increased body weight (BW) gain (p < 0.001) and the food efficiency ratio (FER; p < 0.001); however, SS consumption gradually prevented the HFC-induced BW gain (p < 0.001) and increase in FER (p < 0.01). The HFC diet resulted in increased liver size (p < 0.001) and total adipose tissue weight (p < 0.001), whereas the SS supplementation decreased hepatomegaly (p < 0.05) and body fat mass (p < 0.001). SS consumption prevented the increased activities of serum alanine aminotransferase (ALT; p < 0.001), aspartate aminotransferase (AST; p < 0.001), alkaline phosphatase (ALP; p < 0.01 in HFC + 5SS) and lactate dehydrogenase (LDH; p < 0.001 in HFC + 5SS) induced by the HFC diet (p < 0.001). The SS supplementation improved lipid profiles in the circulation by lowering triglyceride (TG; p < 0.01), total cholesterol (TC; p < 0.001) and non-HDL cholesterol (non-HDL-C; p < 0.001) levels, as well as the atherogenic index (p < 0.01) and cardiac risk factor (p < 0.01). The lipid distribution in the liver (p < 0.05) and white adipose tissues (WAT; p < 0.001) of the HFC + SS diet-consuming rats was remarkably lower than that of the HFC diet-consuming rats. The average size of the epididymal adipose tissue (p < 0.001) was significantly lower in the HFC + SS diet-fed rats than in the HFC diet-fed rats. The fecal lipid (>3% SS; p < 0.001) and cholesterol (5% SS; p < 0.001) efflux levels were significantly elevated by the SS supplementation compared to those measured in the RD or HFC diet-fed groups. In addition, the hepatic lipid and cholesterol metabolism-related gene expressions were affected by SS consumption, as the hepatic anabolic gene expression (Acc; p < 0.001, Fas; p < 0.001 and G6pdh; p < 0.01) was significantly attenuated. The HFC + 5SS diet-fed rats exhibited elevated hepatic Cyp7a1 (p < 0.001), Hmgcr (p < 0.001) and Ldlr (p < 0.001) mRNA expression levels compared to the HFC diet-fed rats. These results suggest that SS may possess anti-adipogenic and lipid-lowering effects by enhancing lipid and cholesterol efflux in mammals.

Interactive Effect of Hesperidin and Vitamin E Supplements on Cholesterol Metabolism in High Cholesterol-Fed Rats

2001 ◽  
Vol 71 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Yong Bok Park ◽  
Kyung-Min Do ◽  
Song-Hae Bok ◽  
Mi-Kyung Lee ◽  
Tae-Sook Jeong ◽  
...  
Keyword(s):  
Vitamin E ◽  
Cholesterol Metabolism ◽  
Reductase Activity ◽  
Plasma Cholesterol ◽  
Interactive Effect ◽  
Free Groups ◽  
Dietary Vitamin ◽  
High Cholesterol ◽  
Triglyceride Content ◽  
Coa Reductase

Certain bioflavonoids are potent antioxidants and have pharmacologic effects similar to those of vitamin E. Accordingly, the interactive effect of hesperidin and vitamin E was studied with respect to cholesterol metabolism and the antioxidant status. Hesperidin supplement (0.1%, wt/wt) with comparable levels of vitamin E was provided with a high-cholesterol (1%, wt/wt) diet to rats for 5 weeks. The amount of vitamin E included in the hesperidin-free and hesperidin diets was either a low (low-E) or a normal (normal-E) level. The hesperidin supplement and different levels of dietary vitamin E did not significantly alter the concentrations of plasma triglycerides. However, the inclusion of hesperidin significantly lowered the concentration of plasma cholesterol in both the low-vitamin E group and the normal-vitamin E group compared to the hesperidin-free groups (p < 0.05). The hepatic triglyceride content was significantly lowered by the hesperidin supplement, as opposed to the plasma triglyceride content, regardless of the vitamin E level in the diet. The hepatic HMG-CoA reductase activity was significantly lowered by the hesperidin supplement with both the low-vitamin E and the normal-vitamin E compared to the hesperidin-free groups (p < 0.05). The hepatic HMG-CoA reductase activity was also significantly lowered with an increase in the dietary vitamin E within the hesperidin and hesperidin-free groups. The excretion of fecal neutral sterol and acidic sterols tended to be lower with the hesperidin supplement. Neither dietary hesperidin nor vitamin E significantly changed the hepatic antioxidant enzyme activity. This data indicates that hesperidin lowers the concentration of plasma cholesterol and the hepatic triglyceride content regardless of the dietary vitamin E level. However, the concentration of plasma cholesterol in the hesperidin-free groups was dependent on the dietary vitamin E level. This information may contribute to understanding the interactive effect of hesperidin and vitamin E on cholesterol biosynthesis in high cholesterol-fed rats.

scholarly journals Effects of saponins on bile acids and plasma lipids in the rat

1979 ◽  
Vol 42 (2) ◽  
pp. 209-216 ◽  
Author(s):  
D. G. Oakenfull ◽  
Dorothy E. Fenwick ◽  
R. L. Hood ◽  
D. L. Topping ◽  
R. L. Illman ◽  
...  
Keyword(s):  
Bile Acids ◽  
Plasma Lipids ◽  
Plasma Lipid ◽  
High Cholesterol Diet ◽  
Cholesterol Diet ◽  
High Cholesterol ◽  
Faecal Excretion ◽  
Neutral Sterols ◽  
Low Cholesterol ◽  
Bile Acid Secretion

1. The effects of feeding isolated saponins on plasma lipid concentrations and on concentrations of biliary and faecal bile acids and neutral sterols were studied in the rat.2. The animals were given one of four diets, i.e. a standard low-cholesterol synthetic diet, the diet+10 g saponins/kg, the diet+10 g cholesterol/kg, the diet+10 g cholesterol+10 g saponins/kg.3. Saponins partially reversed the hypercholesterolaemia caused by the high-cholesterol diet and increased both the rate of bile acid secretion and the faecal excretion of bile acids and neutral sterols. The proportionate contribution of the primary bile acids (particularly chenodeoxycholic) to faecal excretion was also increased by saponins.4. The results are discussed in relation to the hypothesis that saponins act by inducing the adsorption of bile acids by dietary fibre.

scholarly journals Phosphatidylcholine transfer protein regulates size and hepatic uptake of high-density lipoproteins

2005 ◽  
Vol 289 (6) ◽  
pp. G1067-G1074 ◽  
Author(s):  
Michele K. Wu ◽  
David E. Cohen
Keyword(s):  
Plasma Cholesterol ◽  
High Cholesterol Diet ◽  
Atp Binding ◽  
Cholesterol Diet ◽  
Wild Type ◽  
High Cholesterol ◽  
High Fat ◽  
Transfer Protein ◽  
Phosphatidylcholine Transfer Protein ◽  
Atp Binding Cassette

Phosphatidylcholine transfer protein (PC-TP) is a steroidogenic acute regulatory-related transfer domain protein that is enriched in liver cytosol and binds phosphatidylcholines with high specificity. In tissue culture systems, PC-TP promotes ATP-binding cassette protein A1-mediated efflux of cholesterol and phosphatidylcholine molecules as nascent pre-β-high-density lipoprotein (HDL) particles. Here, we explored a role for PC-TP in HDL metabolism in vivo utilizing 8-wk-old male Pctp−/− and wild-type littermate C57BL/6J mice that were fed for 7 days with either chow or a high-fat/high-cholesterol diet. In chow-fed mice, neither plasma cholesterol concentrations nor the concentrations and compositions of plasma phospholipids were influenced by PC-TP expression. However, in Pctp−/− mice, there was an accumulation of small α-migrating HDL particles. This occurred without changes in hepatic expression of ATP-binding cassette protein A1 or in proteins that regulate the intravascular metabolism and clearance of HDL particles. In Pctp−/− mice fed the high-fat/high-cholesterol diet, HDL particle sizes were normalized, whereas plasma cholesterol and phospholipid concentrations were increased compared with wild-type mice. In the absence of upregulation of hepatic ATP-binding cassette protein A1, reduced HDL uptake from plasma into livers of Pctp−/− mice contributed to higher plasma lipid concentrations. These data indicate that PC-TP is not essential for the enrichment of HDL with phosphatidylcholines but that it does modulate particle size and rates of hepatic clearance.

scholarly journals Inhibition of cholesterol biosynthesis through RNF145-dependent ubiquitination of SCAP

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Li Zhang ◽  
Prashant Rajbhandari ◽  
Christina Priest ◽  
Jaspreet Sandhu ◽  
Xiaohui Wu ◽  
...  
Keyword(s):  
Ubiquitin Ligase ◽  
Plasma Cholesterol ◽  
Cholesterol Biosynthesis ◽  
Cholesterol Homeostasis ◽  
High Cholesterol Diet ◽  
High Cholesterol ◽  
Cholesterol Levels ◽  
Expression Of Genes ◽  
Lysine Residues ◽  
Genetic Deletion

Cholesterol homeostasis is maintained through concerted action of the SREBPs and LXRs. Here, we report that RNF145, a previously uncharacterized ER membrane ubiquitin ligase, participates in crosstalk between these critical signaling pathways. RNF145 expression is induced in response to LXR activation and high-cholesterol diet feeding. Transduction of RNF145 into mouse liver inhibits the expression of genes involved in cholesterol biosynthesis and reduces plasma cholesterol levels. Conversely, acute suppression of RNF145 via shRNA-mediated knockdown, or chronic inactivation of RNF145 by genetic deletion, potentiates the expression of cholesterol biosynthetic genes and increases cholesterol levels both in liver and plasma. Mechanistic studies show that RNF145 triggers ubiquitination of SCAP on lysine residues within a cytoplasmic loop essential for COPII binding, potentially inhibiting its transport to Golgi and subsequent processing of SREBP-2. These findings define an additional mechanism linking hepatic sterol levels to the reciprocal actions of the SREBP-2 and LXR pathways.

Effects of dietary flaxseed on vascular contractile function and atherosclerosis during prolonged hypercholesterolemia in rabbits

2006 ◽  
Vol 291 (6) ◽  
pp. H2987-H2996 ◽  
Author(s):  
C. M. C. Dupasquier ◽  
A.-M. Weber ◽  
B. P. Ander ◽  
P. P. Rampersad ◽  
S. Steigerwald ◽  
...  
Keyword(s):  
Vascular Function ◽  
Contractile Function ◽  
Plasma Cholesterol ◽  
Dietary Cholesterol ◽  
Relaxation Response ◽  
High Cholesterol Diet ◽  
Cholesterol Diet ◽  
High Cholesterol ◽  
Beneficial Effects ◽  
Atherosclerotic Lesions

Dietary flaxseed has significant anti-atherogenic effects. However, the limits of this action and its effects on vascular contractile function are not known. We evaluated the effects of flaxseed supplementation on atherosclerosis and vascular function under prolonged hypercholesterolemic conditions in New Zealand White rabbits assigned to one of four groups for 6, 8, or 16 wk of feeding: regular diet (RG), 10% flaxseed-supplemented diet (FX), 0.5% cholesterol-supplemented diet (CH), and 0.5% cholesterol- and 10% flaxseed-supplemented diet (CF). Cholesterol feeding resulted in elevated plasma cholesterol levels and the development of atherosclerosis. The CF group had significantly less atherosclerotic lesions in the aorta and carotid arteries after 6 and 8 wk than the CH animals. However, the anti-atherogenic effect of flaxseed supplementation was completely attenuated by 16 wk. Maximal tension induced in aortic rings either by KCl or norepinephrine was not impaired by dietary cholesterol until 16 wk. This functional impairment was not prevented by including flaxseed in the high-cholesterol diet. Aortic rings from the cholesterol-fed rabbits exhibited an impaired relaxation response to acetylcholine at all time points examined. Including flaxseed in the high-cholesterol diet completely normalized the relaxation response at 6 and 8 wk and partially restored it at 16 wk. No significant changes in the relaxation response induced by sodium nitroprusside were observed in any of the groups. In summary, dietary flaxseed is a valuable strategy to limit cholesterol-induced atherogenesis as well as abnormalities in endothelial-dependent vasorelaxation. However, these beneficial effects were attenuated during prolonged hypercholesterolemic conditions.

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