Dietary alpha-linolenic acid-rich diacylglycerols reduce body weight gain accompanying the stimulation of intestinal beta-oxidation and related gene expressions in C57BL/KsJ-db/db mice.
Dietary fat contributes to the development of obesity. We examined the effect of dietary diacylglycerol (DG), which is a minor component of edible oils, on the development of obesity and expression of genes involved in energy homeostasis in C57BL/KsJ-db/db mice. Mice were fed diets containing either 14 g/100 g (%) triacylglycerol (TG), 10% TG + 4% alpha-linolenic acid-rich TG (ALATG), or 10% TG + 4% alpha-linolenic acid-rich diacylglycerol (ALADG) for 1 mo. Mice fed ALADG, but not ALATG had less body weight gain and higher rectal temperature than the TG-fed controls. These effects were accompanied by up-regulation of acyl-CoA oxidase, medium-chain acyl-CoA dehydrogenase, fatty acid binding protein, and uncoupling protein (UCP)-2 mRNA and beta-oxidation activity in the small intestine. In contrast, the treatments did not affect beta-oxidation and related gene expressions in the liver or UCP-3 mRNA level in skeletal muscle. These results indicate that stimulation of lipid metabolism in the small intestine might be closely related to the antiobesity and thermogenic effects of dietary DG. In addition, structural differences between DG and TG, not variations in the composition of fatty acids, are responsible for the different effects of the lipids.
D044944:Acyl-CoA Dehydrogenases / Q000378:metabolism; D042962:Acyl-CoA Oxidase; D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage* / Q000032:analysis; D004075:Diglycerides / Q000008:administration & dosage* / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D004734:Energy Metabolism / Q000187:drug effects* / Q000502:physiology; D005260:Female; D005786:Gene Expression Regulation; D007421:Intestine, Small / Q000378:metabolism*; D007473:Ion Channels; D008099:Liver / Q000378:metabolism; D026901:Membrane Transport Proteins; D051379:Mice; D008810:Mice, Inbred C57BL; D024101:Mitochondrial Proteins; D009765:Obesity / Q000378:metabolism / Q000517:prevention & control; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D011897:Random Allocation; D013329:Structure-Activity Relationship; D000071246:Uncoupling Protein 2; D000071247:Uncoupling Protein 3; D015430:Weight Gain / Q000187:drug effects*; D017962:alpha-Linolenic Acid / Q000008:administration & dosage* / Q000737:chemistry
D002352:Carrier Proteins; D004042:Dietary Fats, Unsaturated; D004075:Diglycerides; D007473:Ion Channels; D026901:Membrane Transport Proteins; D024101:Mitochondrial Proteins; D011506:Proteins; C000604390:Ucp2 protein, mouse; C000604393:Ucp3 protein, mouse; D000071246:Uncoupling Protein 2; D000071247:Uncoupling Protein 3; D017962:alpha-Linolenic Acid; D010088:Oxidoreductases; D044944:Acyl-CoA Dehydrogenases; D042962:Acyl-CoA Oxidase