Lipoprotein lipases, lipoproteins and tissue lipids in rats fed fish oil or coconut oil.
The effect of fish oil and coconut oil on plasma lipoproteins and lipoprotein-catabolizing enzymes [lipoprotein lipase (LPL) and hepatic endothelial lipase (HL)] was studied in rats. Male rats were fed for 4 wk purified diets containing equienergetic, amounts of either coconut oil (group A), coconut oil:fish oil, 50:50 (group B) or fish oil (group C). Whole plasma triacylglycerol, cholesterol and phospholipid concentrations were appreciably lower in group C than in group A, mainly due to a fall in very low density lipoprotein (VLDL) and subgroup 2 of high density lipoprotein (HDL2), with less consistent changes in LDL and HDL3. VLDL components of group B were also considerably lower than corresponding ones in group A. LPL and HL activities were about 50% lower in groups B and C than in group A. Increased hepatic triacylglycerol and cholesterol concentrations were observed in groups B and C. It is suggested that the decrease in LPL and HL activity of fish oil-fed rats may be an adaptive response to the low concentration of the substrate (triacylglycerols) for these enzymes.
D000818:Animals; D001011:Aorta / Q000187:drug effects / Q000378:metabolism; D002784:Cholesterol / Q000097:blood; D000074263:Coconut Oil; D004041:Dietary Fats / Q000008:administration & dosage / Q000494:pharmacology*; D005395:Fish Oils / Q000008:administration & dosage / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects; D008049:Lipase / Q000378:metabolism; D050356:Lipid Metabolism; D008071:Lipoprotein Lipase / Q000378:metabolism*; D008074:Lipoproteins / Q000097:blood*; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D009206:Myocardium / Q000378:metabolism; D010938:Plant Oils; D051381:Rats; D014280:Triglycerides / Q000097:blood
D004041:Dietary Fats; D005395:Fish Oils; D008074:Lipoproteins; D010938:Plant Oils; D014280:Triglycerides; D002784:Cholesterol; D008049:Lipase; D008071:Lipoprotein Lipase; D000074263:Coconut Oil