Long-Term Effects of Docosahexaenoic Acid-Bound Phospholipids and the Combination of Docosahexaenoic Acid-Bound Triglyceride and Egg Yolk Phospholipid on Lipid Metabolism in Mice

摘要

The bioavailability of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) depends on their chemical forms.This study investigated the long-term effects of DHA-bound triglyceride (TG-DHA),DHA-bound phospholipid (PL-DHA),and the combination of TG-DHA and egg yolk phospholipid (Egg-PL) on lipid metabolism in mice fed with a high-fat diet (fat levels of 22.5％).Male C57BL/6J mice were fed with different formulations containing 0.5％ DHA,including TG-DHA,PL-DHA,and the combination of TG-DHA and Egg-PL,for 6 weeks.Serum,hepatic,and cerebral lipid concentrations and the fatty acid compositions of the liver and brain were determined.The concentrations of serum total triglyceride (TG),total cholesterol (TC),high-density lipoprotein cholesterol (HDL-c),and hepatic TG in the PL-DHA group and the combination group were significantly lower than those in the high-fat (HF) group (P ＜ 0.05).Atherogenic index (AI) of the PL-DHA group was significantly lower than that of the combination group (P＜0.05).Hepatic TC level in the combination group was significantly lower than that in the HF group (P＜0.05),but no significant difference was observed between the combination group and the PL-DHA group.Both the PL-DHA and the combination groups showed significantly increased DHA levels in the liver compared with the HF group (P＜0.05).However,there were no obvious increases in the cerebral DHA levels in all DHA diet groups.These results suggest that PL-DHA was superior to the combination of TG-DHA and Egg-PL in decreasing the AI.Long-term dietary supplementation with low amount of DHA (0.5％) may improve hepatic DHA levels,although cerebral DHA levels may not be enhanced.