Effect of saturated and unsaturated fat diets on lipid profiles of plasma lipoproteins

1982 ◽  
Vol 41 (2-3) ◽  
pp. 221-240 ◽  
Author(s):  
A. Kuksis ◽  
J.J. Myher ◽  
K. Geher ◽  
G.J.L. Jones ◽  
J. Shepherd ◽  
...  
Endocrinology ◽  
2010 ◽  
Vol 151 (9) ◽  
pp. 4187-4196 ◽  
Author(s):  
G. Frangioudakis ◽  
J. Garrard ◽  
K. Raddatz ◽  
J. L. Nadler ◽  
T. W. Mitchell ◽  
...  

Lipid-induced insulin resistance is associated with intracellular accumulation of inhibitory intermediates depending on the prevalent fatty acid (FA) species. In cultured myotubes, ceramide and phosphatidic acid (PA) mediate the effects of the saturated FA palmitate and the unsaturated FA linoleate, respectively. We hypothesized that myriocin (MYR), an inhibitor of de novo ceramide synthesis, would protect against glucose intolerance in saturated fat-fed mice, while lisofylline (LSF), a functional inhibitor of PA synthesis, would protect unsaturated fat-fed mice. Mice were fed diets enriched in saturated fat, n-6 polyunsaturated fat, or chow for 6 wk. Saline, LSF (25 mg/kg · d), or MYR (0.3 mg/kg · d) were administered by mini-pumps in the final 4 wk. Glucose homeostasis was examined by glucose tolerance test. Muscle ceramide and PA were analyzed by mass spectrometry. Expression of LASS isoforms (ceramide synthases) was evaluated by immunoblotting. Both saturated and polyunsaturated fat diets increased muscle ceramide and induced glucose intolerance. MYR and LSF reduced ceramide levels in saturated and unsaturated fat-fed mice. Both inhibitors also improved glucose tolerance in unsaturated fat-fed mice, but only LSF was effective in saturated fat-fed mice. The discrepancy between ceramide and glucose tolerance suggests these improvements may not be related directly to changes in muscle ceramide and may involve other insulin-responsive tissues. Changes in the expression of LASS1 were, however, inversely correlated with alterations in glucose tolerance. The demonstration that LSF can ameliorate glucose intolerance in vivo independent of the dietary FA type indicates it may be a novel intervention for the treatment of insulin resistance.


2000 ◽  
Vol 20 (1) ◽  
pp. 69-78
Author(s):  
Geraldine V. Mitchell ◽  
Erich Grundel ◽  
Mamie Y. Jenkins ◽  
Subramanium Satchithanandam

1988 ◽  
Vol 8 (10) ◽  
pp. 412
Author(s):  
Darlene M. Dreon ◽  
Melissa A. Austin ◽  
Karen M. Vranizan ◽  
Ronald M. Krauss ◽  
Peter D. Wood

Author(s):  
Panayiotis N. Adamopoulos ◽  
Christakis M. Papamichael ◽  
Antonios Zampelas ◽  
Spyros D. Moulopoulos
Keyword(s):  

1986 ◽  
Vol 64 (6) ◽  
pp. 836-839 ◽  
Author(s):  
Jacques Genest

A succinct overview of the nutritional management of hypertension, past, present, and future is presented. Prior to 1945, the low sodium diet and the rice–fruit diet were shown to be effective in reducing the blood pressure to normal levels in 35–40% of hypertensive patients. Between 1945 and the present, many studies were made on the effects of alcohol, water hardness, obesity, moderate restriction of sodium with increased potassium intake, increased dietary calcium, low animal and high unsaturated fat intake, and increased amounts of fiber in the diet. Criticisms are made of the very small magnitude, even if statistically significant, of blood pressure decreases and the too-short control periods in many instances, and also concerning the assumption of use of 24-h urinary sodium as an accurate index of the sodium intake, and of urinary creatinine as a physiological reference standard against the excretion of sodium. The author mentions, for possible future research, long-term studies of the effects of diets moderately restricted in sodium and high in potassium, of reducing weight and increasing physical activity in obese hypertensives, and of low animal and high polyunsaturated fat diets in patients with mild essential hypertension.


2015 ◽  
Vol 3 (3) ◽  
pp. 207-218
Author(s):  
Wael Hatahet ◽  
Abdul Soofi ◽  
Oyonumo Ntekim ◽  
Thomas Fungwe

Dietary fat is known to modulate plasma lipid profiles. Synthesis of high density lipoproteins (HDL), which has protective effects on vascular disease is also influenced by dietary fats, but the mechanisms are unclear. The hapoB100XCETP transgenic mouse was used to investigate the effects of fatty acids on the metabolism of plasma lipoproteins, including the pathway leading to synthesis HDL. Male transgenic mice were fed with diets formulated to provide TG (33% energy) as tripalmitin (TP), triolein (TO), tristearin (TS) or equicaloric substitution of fat with carbohydrate (sucrose) for 4 weeks. Analysis of plasma profile showed that HDL-cholesterol were 53.7+14; 64.6+8.6; 50.2+3.3; 47.0+9.2 and 45.2+4.9 mg/dL for control, oleate, palmitate, stearate and sucrose based diets, respectively. LDL-cholesterol levels were 51.7+7.0; 23.1+7.0; 38.9+2.2; 75.1+1.8 and 46.8.1.0 mg/dl, for control, TO, TP, TS and sucrose, respectively. Hepatic Lecithin-cholesterol acyltransferase (LCAT) protein levels increased by 2-fold in mice fed TS or TO diets, compared to TP, while sucrose had no effect. The scavenger receptor class B type I (SR-B1) which plays an important role in meditating the uptake of HDL-derived cholesterol and cholesteryl ester in the liver and steroidogenic tissues increased in livers of animals fed TP and TO, while TS and sucrose did not have a similar effects. These results suggests that fatty acids can uniquely impact HDL, in addition, the ApoB100XCETP mouse is a useful model for the evaluation of how dietary components affect the risk of developing atherosclerosis and heart disease.


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