Abstract
We investigated modes whereby stearic acid (18∶0) exerts a neutral or cholesterol-lowering effect using dietary fats which provided graded levels of 18∶0 and distinct triacylglycerol (TAG) profiles. Male Sprague-Dawley rats (150–175 g) were fed diets containing 0.2% cholesterol and 16% fat from corn oil, or from 1% corn oil plus 15% lard (13.2% 18∶0), beef tallow (19.2% 18∶0) or cocoa butter (34.7% 18∶0) for 3 wk, and then killed in a fasted or fed state. Chylomicron (CM) fatty acid profiles suggested reduced absorption of 18∶0 with greater 18∶0 intake. CM TAG profiles indicated a reduction or loss of two TAG species compared to the TAG profiles of the stearate-rich diets: 1-palmitoyl-2-oleoyl-3-stearoyl glycerol (POS) and 1,3-distearoyl-2-oleoyl glycerol (SOS). Hepatic total cholesterol concentrations were 54–77% lower (P<0.01) in the cocoa butter-fed than the lard- and beef tallow-fed groups. The cocoa butter group showed a significantly lower ratio of high-density lipoprotein esterified/free cholesterol than all other groups. Hepatic stearoyl-CoA and oleoyl-CoA concentrations, the substrate and product for hepatic δ9 desaturase, were not significantly different for corn oil-fed and cocoa butter-fed groups in spite of a large difference in 18∶0 intake. These data suggest that the neutral or cholesterol-lowering effect of 18∶0 is not due to hepatic conversion of stearic to oleic acid, and that POS and SOS are poorly absorbed from stearate-rich dietary fats.
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Abbreviations
- ANOVA:
-
analysis of variance
- Cn :
-
total acyl carbon number
- CM:
-
chylomicron
- E/F:
-
esterified/free
- EC:
-
esterified cholesterol
- FAME:
-
fatty acid methyl esters
- GC-FID:
-
gas chromatography-flame-ionization detection
- GLM:
-
general linear models
- HDL:
-
high-density lipoprotein
- LDL:
-
low-density lipoprotein
- L:
-
linoleic acid
- O:
-
oleic acid
- P:
-
palmitic acid
- POP:
-
1,3-dipalmitoyl-2-oleoyl glycerol
- POS:
-
1-palmitoyl-2-oleoyl-3-stearoyl glycerol
- SOS:
-
1,3-distearoyl-2-oleoyl glycerol
- TAG:
-
triacylglycerol
- TG:
-
triglycerides
- VLDL:
-
very low density lipoprotein
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Monsma, C.C., Ney, D.M. Interrelationship of stearic acid content and triacylglycerol composition of lard, beef tallow and cocoa butter in rats. Lipids 28, 539–547 (1993). https://doi.org/10.1007/BF02536086
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DOI: https://doi.org/10.1007/BF02536086