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PubMed1978

Effect of decreased availability of substrates on intramuscular triglyceride utilization during exercise.

Intramuscular triglycerides mobilization during prolonged physical exercise was examined in rats fed ad libitum, in rats fasted for 24 h and in rats treated with nicotinic acid. It has been found that during exercise the intramuscular triglyceride level was markedly reduced only in the red muscle but not in the white and intermediate muscles. Fasting significantly augmented the utilization of triglycerides in the red muscle during exericse. The post-exercise triglyceride level in the red muscle of the rats treated with nicotinic acid was similar to that in the control group whereas blood FFA level, in the nicotinic acid-treated group was much lower than in the control group. Nicotinic acid increased glycogen utilization in the liver and in the skeletal muscles during exercise. It may be concluded that the major cause of the reduction of the triglyceride level in the red muscle during exercise is a developing shortage of available carbohydrates. The greatly elevated blood FFA level during exercise does not seem to have a sparing effect on the intramuscular triglyceride level during exercise. However, it does spare glycogen content in the liver and the skeletal muscles.

Animals↗
PubMed1980

Effect of substrate supply and beta-adrenergic blockade on heart glycogen and triglyceride utilization during exercise in the rat.

Exercise-induced heart glycogen and triglyceride mobilization was studied in control rats, in rats with reduced blood glycose supply (fasted rats), in rats with reduced plasma free fatty acids (FFA) supply (nicotinic acid-treated rats), and in rats with blockade of beta-adrenergic receptors (propranolol-treated rats). It was found in the fed control rats that both the heart glycogen and triglyceride levels were reduced at the beginning of the exercise and thereafter they returned to the control level despite the exercise being continued. The triglyceride level was reduced again during the exhaustive exercise. Reduced blood glucose supply increased the heart glycogen and triglyceride utilization during exercise. Partial prevention of the plasma FFA elevation during exercise increased the heart glycogen utilization and had no effect on utilization of the heart triglycerides. Blockade of the beta-adrenergic receptors fully prevented both the heart glycogen and triglyceride mobilization during exercise.

Animals↗
PubMed1978

The effects of chlorpropamide and insulin on serum lipids, lipoproteins and fractional triglyceride removal.

The effects of chlorpropamide on serum lipids, lipoproteins and fractional triglyceride removal have been studied over 12 months on 10 maturity onset diabetics not controlled on diet alone. Similar studies were carried out in 6 maturity onset diabetics who had failed to respond to sulphonylureas and 6 new insulin requiring diabetics. In the chlorpropamide treated patients there was an initial fall in serum and VLDL triglyceride but this effect was lost at 12 months. There was no change in fractional triglyceride removal. At 12 months there was a fall in LDL and a rise in HDL choelsterol. An initial improvement in glucose tolerance and insulin secretion was maintained at 12 months. In the insulin treated group the initial fall in serum and VLDL triglyceride was maintained at 12 months and was accompanied by an increase in fractional triglyceride removal. There was also a fall in LDL and a rise in HDL cholesterol at 12 months. The failure of chlorpropamide to maintain the reduction in serum and VLDL triglyceride could be of importance in the genesis of coronary heart disease in maturity onset diabetics. The fall in LDL and rise in HDL cholesterol found both with chlorpropamide and insulin might be beneficial.

Adult↗
PubMed1984

Muscle and liver glycogen, protein, and triglyceride in the rat. Effect of exercise and of the sympatho-adrenal system.

We have previously found that during exercise net muscle glycogen breakdown is impaired in adrenodemedullated rats, as compared with controls. The present study was carried out to elucidate whether, in rats with deficiencies of the sympatho-adrenal system, diminished exercise-induced glycogenolysis in skeletal muscle was accompanied by increased breakdown of triglyceride and/or protein. Thus, the effect of exhausting swimming and of running on concentrations of glycogen, protein, and triglyceride in skeletal muscle and liver were studied in rats with and without deficiencies of the sympatho-adrenal system. In control rats, both swimming and running decreased the concentration of glycogen in fast-twitch red and slow-twitch red muscle whereas concentrations of protein and triglyceride did not decrease. In the liver, swimming depleted glycogen stores but protein and triglyceride concentrations did not decrease. In exercising rats, muscle glycogen breakdown was impaired by adrenodemedullation and restored by infusion of epinephrine. However, impaired glycogen breakdown during exercise was not accompanied by a significant net breakdown of protein or triglyceride. Surgical sympathectomy of the muscles did not influence muscle substrate concentrations. The results indicate that when glycogenolysis in exercising muscle is impeded by adrenodemedullation no compensatory increase in breakdown of triglyceride and protein in muscle or liver takes place. Thus, indirect evidence suggests that, in exercising adrenodemedullated rats, fatty acids from adipose tissue were burnt instead of muscle glycogen.

Adrenal Medulla↗
PubMed1976

Physiological and analytical variation in cholesterol and triglycerides.

Plasma cholesterol and triglyceride levels were determined, on each of two AutoAnalyzer systems in 11 healthy subjects, weekly over a 10-week and monthly over a 12-month period. Analytical variation was 1-2% for cholesterol and 2-5% for triglyceride. Cholesterol and triglyceride values on frozen quality control serum pools were not indicative of absolute values on fresh plasma. Even though the two AutoAnalyzer systems averaged within 1-2 mg/dl for triglyceride and cholesterol on the serum quality control pools during the 12-month period, the two systems differed by 7-8 mg/dl on fresh or frozen plasma samples. The coefficient of physiological variation on the 10 weekly samples averaged 5% (range 3-10%) for plasma cholesterol and 18% (range 9-27%) for plasma triglyceride. Analysis of the monthly samples suggested significant (P less than 0.05) seasonal trends: cholesterol was highest in the winter months and lowest in October, whereas triglyceride was highest in January and February and lowest in May and December. We conclude that intra-individual variation can be an important source of error in attempting to make a genetic diagnosis of hyperlipidemia and/or in evaluating hypolipidemic regimens in a given subject.

Adult↗
PubMed1992

A study of the composition of fish liver and body oil triglycerides.

Silver-ion high-performance liquid chromatography (Ag(+)-HPLC) was used to study the range and variations in molecular species of triglycerides from industrial, retail and laboratory extracted fish oils. These were contrasted with a typical plant oil. Selected fish oils were fractionated and the fatty acid distribution of the fractions determined by gas-liquid chromatography. Fish oils gave a characteristic Ag(+)-HPLC profile, typified by sharp, intense peaks at the start of the chromatogram and broad, multiple nongaussian peaks for the late eluting components. Triglycerides ranging from those that were wholly saturated to those containing 16 double bonds were isolated. Cod (Gadus spp.), saithe (Pollachius virens) and monkfish (Squatina squatina) liver oils gave similar triglyceride profiles. Mackerel (Scomber scombrus), capelin (Mallotus villosus) and herring (Clupea harengus) body oils gave characteristic triglyceride profiles which were associated with high concentrations of 20:1 and 22:1 fatty acids. Only small amounts of these particular triglycerides were observed for menhaden (Brevoortia spp.), South African anchovy (Engraulis capensis) and Indian sardine (Sardinella longiceps) oils, all of which contained minor amounts of these acids. The latter oils contained highly unsaturated triglycerides, whereas only traces of these were noted for the former. Chromatography with Ag(+)-HPLC can be used for the rapid screening of fish oils and for selecting those oils rich in polyunsaturated acids that may be suitable for enrichment. Cottonseed oil gave well-defined and discrete peaks. Similar peaks were observed in the chromatogram of Omega-combination, a mixture of primrose and fish oils. Thus, fish, plant and a mixture of these oils can be readily distinguished.

Chromatography, Gas↗
PubMed1995

Dietary oligofructose lowers triglycerides, phospholipids and cholesterol in serum and very low density lipoproteins of rats.

The present study was aimed at answering the question why feeding rats an oligofructose (OFS) supplemented diet could cause a significant reduction in plasma lipid levels. Daily administration of a 10% (w/w) OFS-containing diet to normolipidemic male rats resulted in a decrease in plasma triglycerides, phospholipids and cholesterol. The triglyceride-lowering effect was observed after one week and lasted for at least 16 wk and was associated with a reduction in plasma very low density lipoproteins, indicating that the hypolipidemic effect of OFS may be due to changes in liver lipid metabolism. We therefore tested whether OFS feeding modified the capacity of the liver to synthesize triglycerides from free fatty acids. Hepatocytes isolated from livers of control and OFS-fed rats were incubated in the presence of [1-14C]palmitate, and both intracellular and extracellular [14C]triglyceride formation were quantified. We found that chronic feeding of an OFS-supplemented diet to rats significantly reduced the capacity of isolated hepatocytes to synthesize triglycerides from palmitate. The results suggest that, like other soluble dietary fibers, OFS significantly alters liver lipid metabolism, resulting over time in a significant reduction in plasma triglyceride, phospholipid and cholesterol levels.

Analysis of Variance↗
PubMed1995

Analysis of triglycerides using atmospheric pressure chemical ionization mass spectrometry.

Atmospheric pressure chemical ionization (APCI) mass spectrometry was investigated as a new method for analysis of a mixture of triglycerides separated by reverse-phase high-performance liquid chromatography. A mixture of homogeneous (monoacid) triglyceride standards containing fatty acids with zero to three double bonds was analyzed to demonstrate the quality of mass spectra obtained by using the APCI interface. The mass spectra showed that minimal fragmentation occurs, resulting primarily in diglyceride [M-RCOO]+ ions and [M + 1]+ protonated molecular ions. The degree of unsaturation within the acyl chains had a marked effect on the proportion of diglyceride ions vs. the [M + 1]+ ions formed in the APCI source. The mass spectra of triglycerides containing fatty acids with two or three double bonds showed predominantly protonated triglyceride ions, with diglyceride peaks representing 13 to 25% of the base peak. The triglycerides containing singly unsaturated fatty acids gave diglyceride ions as the base peak, and [M + 1]+ ions with an intensity 20 to 28% that of the base peak. Only diglyceride ions were observable in the spectra of triglycerides containing saturated fatty acids.

Atmospheric Pressure↗
PubMed2003

A combination of high concentrations of serum triglyceride and non-high-density-lipoprotein-cholesterol is a risk factor for cardiovascular disease in subjects with abnormal glucose metabolism--The Hoorn Study.

AIMS/HYPOTHESIS: Type 2 diabetes is not only associated with hyperglycaemia, but also with disorders of lipid metabolism. The aim of this study was to investigate the association of triglyceride and non-HDL-cholesterol concentrations with cardiovascular disease in subjects with normal and abnormal glucose metabolism. METHODS: Subjects were 869 men and 948 women aged 50 to 75 who participated in the Hoorn Study, a population-based cohort study that started in 1989. Glucose metabolism was determined by a 75 g OGTT. High fasting triglyceride and non-HDL-cholesterol concentrations were defined as above the median of the study population. RESULTS: After 10 years of follow-up, the age- and sex-adjusted hazard ratios for cardiovascular disease were 1.35 (1.11-1.64) and 1.71 (1.40-2.08) for high triglycerides and high non-HDL-cholesterol, respectively, after mutual adjustment. After stratification for glucose metabolism status, the hazard ratios for cardiovascular disease for non-HDL-cholesterol were 1.70 (1.31-2.21) in normal glucose metabolism and 1.56 (1.12-2.18) in abnormal glucose metabolism. Triglycerides were not a risk factor in subjects with normal glucose metabolism, with a hazard ratio of 0.94 (0.73-1.22), but in subjects with abnormal glucose metabolism, the hazard ratio for cardiovascular disease was 1.54 (1.07-2.22). In subjects with abnormal glucose metabolism, the hazard ratio for the combined presence of high triglycerides and non-HDL-cholesterol was 2.12 (1.35-3.34). CONCLUSION: Our data suggest that in people with abnormal glucose metabolism, but not in those with normal glucose metabolism, high triglyceride concentration could be associated with the risk of cardiovascular disease, particularly in people with high non-HDL-cholesterol.

Blood Glucose↗
PubMed2004

The effects of rosiglitazone on fatty acid and triglyceride metabolism in type 2 diabetes.

AIMS/HYPOTHESIS: We investigated the effects of rosiglitazone on NEFA and triglyceride metabolism in type 2 diabetes. METHODS: In a double-blind, placebo-controlled, cross-over study of rosiglitazone in diet-treated type 2 diabetic subjects, we measured arteriovenous differences and tissue blood flow in forearm muscle and subcutaneous abdominal adipose tissue, used stable isotope techniques, and analysed gene expression. Responses to a mixed meal containing [1,1,1-(13)C]tripalmitin were assessed. RESULTS: Rosiglitazone induced insulin sensitisation without altering fasting NEFA concentrations (-6.6%, p=0.16). Postprandial NEFA concentrations were lowered by rosiglitazone compared with placebo (-21%, p=0.04). Adipose tissue NEFA release was not decreased in the fasting state by rosiglitazone treatment (+24%, p=0.17) and was associated with an increased fasting hormone-sensitive lipase rate of action (+118%, p=0.01). Postprandial triglyceride concentrations were decreased by rosiglitazone treatment (-26%, p<0.01) despite unchanged fasting concentrations. Rosiglitazone did not change concentrations of triglyceride-rich lipoprotein remnants. Adipose tissue blood flow increased with rosiglitazone (+32%, p=0.03). Postprandial triglyceride [(13)C]palmitic acid concentrations were unchanged, whilst NEFA [(13)C]palmitic acid concentrations were decreased (p=0.04). In muscle, hexokinase II mRNA expression was increased by rosiglitazone (+166%, p=0.001) whilst the expression of genes involved in insulin signalling was unchanged. Adipose tissue expression of FABP4, LPL and FAT/CD36 was increased. CONCLUSIONS/INTERPRETATION: Rosiglitazone decreases postprandial NEFA and triglyceride concentrations. This may represent decreased spillover of NEFAs from adipose tissue depots. Decreased delivery of NEFAs to the liver may lead to lowered postprandial triglyceride concentrations. Upregulation of hexokinase II expression in muscle may contribute to insulin sensitisation by rosiglitazone.

Adipose Tissue↗
PubMed2006

Vildagliptin therapy reduces postprandial intestinal triglyceride-rich lipoprotein particles in patients with type 2 diabetes.

AIMS/HYPOTHESIS: We assessed the effects of vildagliptin, a novel dipeptidyl peptidase IV inhibitor, on postprandial lipid and lipoprotein metabolism in patients with type 2 diabetes. SUBJECTS, MATERIALS AND METHODS: This was a single-centre, randomised, double-blind study in drug-naive patients with type 2 diabetes. Patients received vildagliptin (50 mg twice daily, n=15) or placebo (n=16) for 4 weeks. Triglyceride, cholesterol, lipoprotein, glucose, insulin, glucagon and glucagon-like peptide-1 (GLP-1) responses to a fat-rich mixed meal were determined for 8 h postprandially before and after 4 weeks of treatment. RESULTS: Relative to placebo, 4 weeks of treatment with vildagliptin decreased the AUC(0-8h) for total trigyceride by 22+/-11% (p=0.037), the incremental AUC(0-8h) (IAUC(0-8h)) for total triglyceride by 85+/-47% (p=0.065), the AUC(0-8h) for chylomicron triglyceride by 65+/-19% (p=0.001) and the IAUC(0-8h) for chylomicron triglyceride by 91+/-28% (p=0.002). This was associated with a decrease in chylomicron apolipoprotein B-48 (AUC(0-8h), -1.0+/-0.5 mg l(-1) h, p=0.037) and chylomicron cholesterol (AUC(0-8h), -0.14+/-0.07 mmol l(-1) h, p=0.046). Consistent with previous studies, 4 weeks of treatment with vildagliptin also increased intact GLP-1, suppressed inappropriate glucagon secretion, decreased fasting and postprandial glucose, and decreased HbA(1c) from a baseline of 6.7% (change, -0.4+/-0.1%, p<0.001), all relative to placebo. CONCLUSIONS/INTERPRETATION: Treatment with vildagliptin for 4 weeks improves postprandial plasma triglyceride and apolipoprotein B-48-containing triglyceride-rich lipoprotein particle metabolism after a fat-rich meal. The mechanisms underlying the effects of this dipeptidyl peptidase IV inhibitor on postprandial lipid metabolism remain to be explored.

Adamantane↗
PubMed2000

Insulin and non-esterified fatty acid relations to alimentary lipaemia and plasma concentrations of postprandial triglyceride-rich lipoproteins in healthy middle-aged men.

AIMS/HYPOTHESIS: Enhanced and prolonged postprandial lipaemia is related to cardiovascular disease but how postprandial lipaemia is regulated is poorly known. We therefore determined the relations of fasting insulin concentrations to fasting and postprandial lipids, lipoproteins and non-esterified fatty acids in middle-aged men. METHODS: The subjects, 99 healthy 50-year-old men with an apolipoprotein E3/3 genotype, ate a mixed meal. The apolipoprotein B-48 and B-100 contents were determined in triglyceride-rich lipoproteins as a measure of chylomicron remnant and very low density lipoprotein particle concentrations. RESULTS: Fasting plasma insulin was associated with the triglyceride response to the test meal, independently of body mass index, waist-to-hip circumference ratio, blood glucose and the insulin effect on fasting plasma triglycerides. Exaggerated and prolonged postprandial lipaemia in subjects in the upper quartile of the plasma insulin distribution was largely accounted for by large (Svedberg flotation rate > 60) very low density lipoproteins and chylomicron remnants. Insulin relations to large postprandial triglyceride-rich lipoproteins exclusively reflected the association between plasma insulin and the fasting plasma concentrations of these lipoprotein species, whereas plasma insulin and late postprandial plasma concentrations of small (Svedberg flotation rate 20-60) chylomicron remnants were related, independently of insulin influences on fasting concentrations. Strong positive relations were found between the late increases in large triglyceride-rich lipoproteins and plasma non-esterified fatty acid concentrations after 6 h. CONCLUSION/INTERPRETATION: The degree of insulin sensitivity is a major determinant of postprandial lipaemia in healthy middle-aged men and could add to the regulation of the basal production of large triglyceride-rich lipoproteins.

Analysis of Variance↗
PubMed2006

Effects of isotretinoin on the metabolism of triglyceride-rich lipoproteins and on the lipid profile in patients with acne.

Isotretinoin treatment alters the plasma lipid levels but the mechanisms and the effects on the metabolism of triglyceride-rich lipoproteins such as chylomicrons and very-low-density lipoproteins remain unclear. We investigated the effect of isotretinoin on the plasma kinetics of emulsion models of triglyceride-rich lipoproteins and the lipid profile. Ten patients with acne were treated with 0.8 mg/kg of isotretinoin over 4 weeks for comparison with non-treated acne patients. In both groups the plasma kinetic study of a triglyceride-rich emulsion double-labeled with 14C-cholesterol oleate and 3H-triolein was performed after intravenous injection of the emulsion and radioactive counting in plasma samples collected over 60 min. Patients using isotretinoin showed decreased removal from the plasma of the 3H-triglyceride (median 0.019 min-1 TG) compared with controls (median 0.044 min-1, P=0.007), and the removal of the emulsion 14C-cholesterol oleate also tended to be decreased (treatment: 0.011 min-1; controls: 0.024 min-1, P=0.06). The values of total and LDL cholesterol and triglycerides were increased post-treatment (P<0.03). In conclusion, while increasing the fasting plasma concentration of VLDL and LDL, which are traditional risk factors for atherosclerosis, isotretinoin treatment also slows down the metabolism of triglyceride-rich lipoproteins such as chylomicrons, as tested by the emulsion model, an effect that is also increasingly recognized as atherogenic.

Acne Vulgaris↗
PubMed2002

Relationship between smoking habits and low-density lipoprotein-cholesterol, high-density lipoprotein-cholesterol, and triglycerides in a hypercholesterolemic adult cohort, in relation to gender and age.

Elevated total cholesterol, the related low-density lipoprotein-cholesterol, high-density lipoprotein-cholesterol, triglycerides, and smoking habits are risk factors for cardiovascular disease. The objective of this study was to investigate the influence of habitual smoking on these parameters in 492 hypercholesterolemic men and women, aged between 26 and 66 years. Relative differences between smokers and non-smokers in the mean values of total cholesterol, low-density and hig-density lipoprotein-cholesterol, and triglycerides were 2.2%, 5.5%, -8.1%, and 13.7%, respectively. These differences were statistically significant (P<0.04). Over the entire cohort, including men and women, age did not affect the mean values significantly, except for total cholesterol and triglyceride values in smoking women, which were significantly higher in women over 50 years than in the younger women (P=0.011 and P=0.004). In both men and women, regardless of smoking habits, 43%-59% of subjects exceeded the upper reference range value for low-density lipoprotein-cholesterol (4.9 mmol/l), while 38%-59% exceeded the upper reference range value for triglycerides (2.0 mmol/l) and 82%-91% had values below the lower reference range value for high-density lipoprotein-cholesterol (0.9 mmol/l for men, 1.2 mmol/l for women). Smoking habits hardly influenced the extent to which reference values were exceeded, except for low-density lipoprotein-cholesterol in all subjects (higher percentage for smokers, P=0.041). Similar results were obtained for age, except for triglycerides in smoking women, wich showed high values in 26% of women <50 years versus 50% of women > or = 50 years (P=0.026). In conclusion, smoking has an adverse effect on low-density and high-density lipoprotein-cholesterol, and triglycerides in a hypercholesterolemic population of men and women, regardless of age.

Adult↗
PubMed2005

The influence of water content of triglyceride oils on the solubility of steroids.

PURPOSE: To determine if hydration of long- and medium-chain triglyceride oils (long = soybean and olive, medium = Miglyol 812) has a significant effect on the ability to solubize the model hydrophobic compounds progesterone, estradiol, and testosterone. METHODS: Soybean, olive, and Miglyol 812 oils were treated in one of two ways: hydrated or desiccated (hydrated, then dried). Solubility of (3)H-labeled progesterone, estradiol, and testosterone in the triglycerides was measured by liquid scintillation counting. RESULTS: Both hydration state and chain length of the triglycerides were shown to have a significant influence on the solubility of steroids. Solubility of estradiol hemihydrate and testosterone monohydrate in hydrated triglycerides is decreased by about 30%-40% compared with desiccated oils. The solubility of anhydrous testosterone was decreased by hydration of the oils due to conversion to the monohydrate crystalline form. In contrast, the solubility of progesterone was insensitive to the state of hydration of all oils. CONCLUSIONS: Hydration of triglyceride oils caused a significant decrease in the solubility of steroids, which may form hydrates or hemihydrates. Results suggest the need for knowledge of the hydration state of triglyceride oils to be used as pharmaceutical excipients.

Chemistry, Pharmaceutical↗
PubMed2000

Fatty acid chain length and degree of unsaturation are inversely associated with serum triglycerides.

Little is known about the association between dietary fatty acids and serum triglycericle concentrations. Plasma fatty acids may reflect dietary intake and can be used to study the relationship between concentrations of individual fatty acids and serum lipids. We examined the cross-sectional relationship of plasma fatty acids with serum nonfasting triglyceride and total cholesterol concentrations. Relative concentrations of individual plasma phospholipid fatty acids were determined by gas liquid chromatography among 4,158 men aged 40-42 yr, who participated in a population study. The pattern of associations between individual fatty acids and cholesterol was different from that between individual fatty acids and triglyceride concentrations. All fatty acids displayed positive associations with total cholesterol concentration except linoleic acid, which was inversely related to cholesterol. In contrast, associations between individual fatty acids and triglyceride concentrations differed in strength and direction depending on both carbon chain length and the degree of unsaturation. Concentrations of very long chain (20 carbon atoms or more) saturated, monounsaturated, and n-3 polyunsaturated fatty acids showed significant inverse associations with triglycerides, whereas shorter fatty acids within these classes were positively associated with triglyceride concentrations. The present data suggest that the associations between concentrations of serum triglycerides and plasma phospholipid fatty acids depend on both fatty acid chain length and the degree of unsaturation.

Adult↗
PubMed1999

Positional analysis of triglycerides and phospholipids rich in long-chain polyunsaturated fatty acids.

Four sources of long-chain polyunsaturated fatty acids (LCP) differing in their chemical structure (triglycerides or phospholipids) and in their origin (tuna triglycerides, fungal triglycerides, egg phospholipids, and pig brain phospholipids) were analyzed to determine the distribution of the component fatty acids within the molecule. Lipase and phospholipase A2 hydrolysis was performed to obtain 2-monoacylglycerols and lysophospholipids, respectively, which allowed us to determine the distribution of fatty acids between the sn-2 and sn-1,3 positions of triglycerides or between the sn-1 and sn-2 position of phospholipids. Fatty acids in the LCP sources analyzed were not randomly distributed. In tuna triglycerides, half of the total amount of 22:6n-3 was located at the sn-2 position (49.52%). In fungal triglycerides, 16:0 and 18:0 were esterified to the sn-1,3 (92.22% and 91.91%, respectively)18:1 and 18:2 to the sn-2 position (59.77% and 62.62%, respectively), and 45% of 20:3n-6 and only 21.64% of 20:4n-6 were found at the sn-2 position. In the lipid sources containing phospholipids, LCP were mainly esterified to the phosphatidylethanolamine fraction. In egg phospholipids, most of 20:4n-6 (5.50%, sn-2 vs. 0.91%, sn-1) and 22:6n-3 (2.89 vs. 0.28%) were located at the sn-2 position. In pig brain phospholipids, 22:6n-3 was also esterified to the sn-2 (13.20 vs. 0.27%), whereas 20:4n-6 was distributed between the two positions (12.35 vs. 5.86%). These results show a different fatty acid composition and distribution of dietary LCP sources, which may affect the absorption, distribution, and tissue uptake of LCP, and should be taken into account when supplementing infant formulas.

Animals↗
PubMed1986

The triglyceride issue: a view from Framingham.

Triglycerides make up the overwhelming proportion of dietary fat consumed in the United States and other industrialized nations. Triglyceride elevation is directly associated with relative weight and age in both sexes, oral contraceptive use in women, and the development of diabetes mellitus. Triglyceride elevations are a highly significant independent risk factor for coronary heart disease (CHD) in women. They appear to be important in men with low high-density lipoprotein (HDL) cholesterol (less than 40 ml/dl). Dangerously high levels of triglyceride are associated with a high total cholesterol/HDL cholesterol ratio, which is an excellent indicator of CHD risk in both sexes. Individuals with elevated triglycerides should be considered at risk for CHD unless the total cholesterol/HDL cholesterol ratio is under 3.5. In practice, however, only about 10% of individuals with elevated triglycerides prove to have such low total cholesterol/HDL cholesterol ratios.

Adolescent↗