摄食DHA-磷脂酰丝氨酸对发育期小鼠体组织DHA水平的影响

目的：比较研究断乳后干预二十二碳六烯酸-磷脂酰丝氨酸（docosahexaenoic acid-phosphatidylserine， DHA-PS）和DHA-甘油三酯（DHA-triglyceride，DHA-TG）对发育期ICR小鼠体组织DHA含量以及脂肪酸组成的影 响。方法：母鼠孕期及哺乳期喂饲n-3多不饱和脂肪酸（n-3 polyunsaturated fatty acids，n-3 PUFAs）缺乏饲料，子代 雄小鼠断乳后随机分为3 组，分别喂饲n-3 PUFAs缺乏饲料（n-3缺乏组）、DHA-TG饲料（DHA-TG组）、DHA-PS 饲料（DHA-PS组），每组8 只，喂养2 周后检测小鼠脑皮质、精巢、肝脏、红细胞中脂肪酸组成和DHA含量。结 果：补充DHA-PS和DHA-TG可以使发育期小鼠各组织中DHA含量显著增加（P＜0.05），二十二碳五烯酸和花生四 烯酸含量显著降低（P＜0.05）。DHA-TG组精巢中DHA含量明显高于DHA-PS组；DHA-PS组肝脏TG、磷脂和红细 胞中DHA水平显著高于DHA-TG组（P＜0.05），而两组脑皮质DHA水平无显著性差异（P＞0.05）。结论：膳食补 充DHA-PS和DHA-TG均可明显提高发育期小鼠各组织中DHA水平，但二者的组织蓄积特性不同，DHA-PS可以更 高效地提高小鼠肝脏和红细胞中DHA水平。

Effect of Dietary DHA-Phosphatidylserine on DHA Level of Body Tissues in Developing Mice

Objective: To investigate the comparative effects of post-weaning dietary docosahexaenoic acidphosphatidylserine (DHA-PS) and DHA-triglyceride (DHA-TG) on DHA concentration and fatty acid composition of lipids in various tissues of developing mice. Methods: ICR female mice were fed n-3 polyunsaturated fatty acids (PUFAs) deficient diet during maternal pregnancy and lactation, and the weanling (3-week old) ICR-strain male mouse pups were randomly assigned to three groups, which were fed three different types of diets including n-3 PUFAs deficiency (n-3 PUFAs Def group), DHA-TG (DHA-TG group) and DHA-PS (DHA-PS group), respectively. After 2 weeks of feeding, all mouse pups were sacrificed, and cortex, testis, liver, and red blood cells were harvested for detecting DHA level and fatty acid composition of lipids. Results: Compared to the n-3 Def group, the concentration of DHA in developing mouse tissues in the DHA-TG and DHA-PS groups was significantly increased, whereas the concentrations of docosapentaenoic acid (DPA) and arachidonic acid (AA) were decreased. The DHA-PS group exhibited significantly higher DHA levels in erythrocytes, liver triglyceride and phospholipid but lower DHA level in testis compared with the DHA-TG group. There was no difference in DHA level in cortex between the two groups. Conclusion: Dietary supplementation of DHA-PS and DHA-TG significantly increased the level of DHA in the tissues of developing mice, but resulted in different accumulation patterns of DHA and DHA-PS more effectively increased DHA contents in the liver and erythrocytes.