Free fatty acids activate a high-affinity saturable pathway for degradation of low-density lipoproteins in fibroblasts from a subject homozygous for familial hypercholesterolemia

Biochemistry ◽  
1992 ◽  
Vol 31 (19) ◽  
pp. 4628-4636 ◽  
Author(s):  
Bernard E. Bihain ◽  
Frances T. Yen
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Familial Hypercholesterolemia ◽  
Low Density Lipoproteins ◽  
Low Density ◽  
High Affinity

Effect of feeding protected lipid to dairy cows in early lactation on the composition of blood lipoproteins and secretion of fatty acids in milk

1980 ◽  
Vol 94 (3) ◽  
pp. 503-516 ◽  
Author(s):  
J. E. Storry ◽  
P. E. Brumby ◽  
B. Tuckley ◽  
V. A. Welch ◽  
D. Stead ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Mammary Gland ◽  
Fatty Acid ◽  
Free Fatty Acids ◽  
Milk Fat ◽  
Low Density Lipoproteins ◽  
Total Serum ◽  
Low Density ◽  
Dietary Intakes ◽  
Vldl Triglyceride

SummaryEffects of 0, 1·7, 3·3 or 5·0 kg/day of a protected soya bean – tallow supplement, incorporated into a hay:concentrate diet (25:75) and fed ad libitumto Friesian cows, on intake and digestion of fatty acids, on output of milk fatty acids and on blood lipoprotein composition were measured.Most of the increased intake of fatty acids, approximately 1 kg/day, was accounted for by increased intakes of C16:0, C18:0 and C18:1. At low intakes, amounts of all fatty acids apparently digested were linearly related to their respective intakes. At high intakes of C16 and C18 acids, curvilinear relationships were established.Yield of total milk fat was related positively to dietary intakes of total fatty acid and carbohydrate and negatively to live-weight change. Yields of short and intermediate chain acids in milk, synthesized within the mammary gland, were negatively correlated and yields of C18 fatty acids positively correlated with respective dietary intakes of these acids. Decreased proportions of C4–16 and increased proportions of C18:0 and C18:1 fatty acids in milk were associated with increased protected tallow in the diet. Yields of C16:1 and C18:1 were positively related to corresponding outputs of saturated acids and negatively to weeks of lactation. The proportion of C18:1 in milk was positively related to the corresponding proportion of C18:0.The increased intake of fatty acids resulted in increased concentrations of very low density lipoproteins (VLDL, d < 1·019 g/ml), low density lipoproteins (LDL1 + LDL2, 1·019 < d < 1·06 g/ml), high density lipoproteins (d > 1·060 g/ml) and serum free fatty acids. Most of the increase in low density lipoproteins was accounted for by a very large increase in LDL1, whose proportion increased from 17 to 75% (2 to 22% of total serum lipid). The proportion of triglyceride in the combined low density lipoprotein fraction decreased from 11 to 2% whilst phospholipids increased from 29 to 36%. These changes were attributed to the increased proportion of LDL1 present.The proportions of VLDL and LDL triglyceride taken up by the mammary gland averaged 0·79 and 0·34 respectively. The proportion of VLDL+LDL triglyceride taken up by the gland decreased with increased amounts of fatty acid digested. Yields of C18 fatty acids in milk tended to be positively related to apparent uptakes of VLDL triglyceride and to VLDL C18 fatty acids, but negatively related to apparent uptakes of LDL triglycerides and LDL C18 fatty acids. It is suggested that the increased LDL1 resulted from the utilization of VLDL triglyceride for milk fat formation.Protected lipid feeding increased the proportion of C14:0, C16:0 C16:1 and C18:1 and decreased the proportions of C14:1 and C18:0 fatty acids in jugular serum triglycerides. Similar changes were observed in jugular VLDL triglycerides. Differences in the compositions of VLDL and LDL triglycerides across the mammary gland were observed and attributed either to selective uptake or to interchange of fatty acids between triglycerides and free fatty acids.

scholarly journals The effect of oil phytopreparations on the lipid status in an experiment

2012 ◽  
Vol 93 (4) ◽  
pp. 561-563
Author(s):  
A K Berdgaleeva ◽  
N T Aldiyarova ◽  
S K Sakhanova
Keyword(s):  
Fatty Acids ◽  
Blood Serum ◽  
Free Fatty Acids ◽  
Low Density Lipoproteins ◽  
High Density Lipoproteins ◽  
Phospholipid Content ◽  
Low Density ◽  
Cholesterol Diet ◽  
Lipid Status ◽  
Oil Extract

Aim. To study the effect of oil extracts of the burdock root and elecampane on the lipid profile in an experimental model of cholesterolosis. Methods. Experiments were performed on 60 white nonlinear rats, weighing 180-300 g. The oil extract from the burdock root was administered intragastrically at a dose of 2.5 ml/kg, and an extract from the root of elecampane - at a dose of 1.0 ml/kg during the last 30 days on the background of a cholesterol diet. After removal of the animals from the experiment the levels of cholesterol, triglycerides, high and low density lipoproteins, phospholipids, free fatty acids were determined in the blood serum and in liver homogenates with the use of standardized sets. Results. Administration of oil extracts of the burdock root and elecampane on the background of a cholesterol diet resulted in a significant reduction in serum cholesterol level by average of 1.48 times, triglycerides level - by 1.9 times, low-density lipoproteins level - by 1.8 times, as well as in a significant increase in the level of high-density lipoproteins on average by 1.5 times compared with the pathology model. In the same conditions the oil extracts of the burdock root and elecampane significantly increased the phospholipid content in the liver tissue by 1.4 and 1.7 times, respectively, the content of free fatty acids - by 2 times in average, the content of esterified cholesterol - by about 1.5 times as compared with the pathology model. Conclusion. The studied oils have a unidirectional positive effect on the lipid content in blood serum and liver in an experimental cholesterolosis; the oil extract from the root of elecampane has a more pronounced effect.

scholarly journals EFFECTS OF GROSSHEMIN AND GROSSMISIN ON THE ACUTE HYPERLIPIDEMIA MODEL INDUCED BY ETHANOL

2014 ◽  
Vol 13 (1) ◽  
pp. 67-72 ◽  
Author(s):  
A. V. Ratkin ◽  
O. A. Kaidash ◽  
V. V. Ivanov ◽  
A. I. Vengerovsky ◽  
S. M. Adekenov ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Nicotinic Acid ◽  
Blood Serum ◽  
Free Fatty Acids ◽  
Total Cholesterol ◽  
Sesquiterpene Lactones ◽  
Low Density Lipoproteins ◽  
High Density ◽  
High Density Lipoproteins ◽  
Low Density

Objective: study sesquiterpene lactones grosshemin and grossmisin lipid-lowering properties on the model of acute hyperlipidemia induced by ethanol in rats.Materials and methods. Rats during 7 days injected into the stomach grosshemin and grossmisin in a dose 10 mg/kg or reference drug nicotinic acid in a dose 25 mg/kg. Hyperlipidemia caused by single introduction of ethanol into the stomach in a dose 5 g/kg. In blood serum of tail vein measured the triacylglycerols, total cholesterol, high density and low density lipoproteins cholesterol, also the level of free fatty acids. Calculated the ratio of high density lipoproteins cholesterol to the amount of low density lipoproteins cholesterol and the index of atherogenicity.Results. A single dose of ethanol increased serum level of triacylglycerols in 1.9 times, free fatty acids – in 3.2 times, low density lipoproteins – on 44% in comparison with the intact animals indices. It shows the development of acute hyperlipidemia. Serum total cholesterol, high density lipoproteins cholesterol and the index of atherogenicity were not changed. Course sesquiterpene lactones grosshemin and grossmisin introduction against the background of acute hyperlipidemia was accompanied by a decrease in the serum of triacylglycerols levels respectively by 19.8% and 34.1%. Nicotinic acid lowered the content of triacylglycerols by 42.4%. Grosshemin and nicotinic acid reduced the increased level of free fatty acids in the blood serum by 60.7–67.9%. Grossmisin and nicotinic acid decreased by 14.6–17.2% of total cholesterol in the blood serum. In acute hyperlipidemia grosshemin and grossmisin reduced low density lipoproteins cholesterol by 17.6% and 20%, respectively, nicotinic acid – by 15.7%. Both of sesquiterpene lactone and nicotinic acid did not modify the content of high density lipoproteins cholesterol. When introduction grosshemin, grossmisin and nicotinic acid ratio of high density lipoproteins cholesterol to the amount of low density lipoproteins cholesterol significantly increased by 42.8%, 38,6% and 22.1% respectively.Conclusion. Sesquiterpene lactones grosshemin and grossmisin posses hypolipidemic effect in acute experimental hyperlipidemia caused by the ethanol introduction. Lactones normalize many indices of lipid metabolism, which can be caused by different biochemical targets of these molecules. Lactones, as nicotinic acid, in the model of acute hyperlipidemia decrease in blood serum triacylglycerols, total cholesterol, and low density lipoproteins cholesterol content. Grosshemin and nicotinic acid also reduce the free fatty acids level.

Metabolism of palmitate and linoleate in intact dogs

1962 ◽  
Vol 203 (5) ◽  
pp. 914-918 ◽  
Author(s):  
P. J. Nestel ◽  
A. Bezman ◽  
R. J. Havel
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Milk Fat ◽  
Plasma Lipids ◽  
Corn Oil ◽  
Low Density Lipoproteins ◽  
High Density Lipoproteins ◽  
Low Density ◽  
Very Low Density Lipoproteins ◽  
Two Populations

Palmitate-9, 10-H3 and linoleate-1-C14 were infused simultaneously into intact dogs as albumin-bound free fatty acids or as esterified fatty acids in chylomicrons. Linoleate bound to albumin was removed more rapidly from the plasma and was incorporated more extensively into triglycerides of very low density lipoproteins of plasma than palmitate. Both linoleate and palmitate were incorporated more slowly into triglyceride fatty acids of low density and high density lipoproteins than into those of very low density lipoproteins. When chylomicrons obtained separately from dogs fed palmitate-9, 10-H3 with milk fat and linoleate-1-C14 with corn oil were mixed and infused into recipients, the rates of removal from the blood of both triglycerides and phospholipids of the two populations of chylomicrons differed, but this did not seem to depend on their chemical composition. Linoleate derived from chylomicron triglycerides disappeared from hepatic triglycerides and phospholipids more rapidly than palmitate and was incorporated more extensively into plasma lipids. Palmitate and linoleate were incorporated in equivalent amounts into circulating free fatty acids, but more linoleate was found in lipids of adipose tissue.

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