Daniel M. Lamontagne-Kam , Saeideh Davari , Juan J. Aristizabal-Henao , Seungjae Cho , Dan Chalil , John G. Mielke , Ken D. Stark
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Behavioral testing showed that there was a significant diet x sex interaction for two key measures of spatial memory (distance to zone and time spent in the correct quadrant during the probe test), with female rats benefiting the most from DHA supplementation. Lipidomic analyses suggest levels of arachidonic acid (ARA) and n-6 docosapentaenoic acid (DPA) containing phospholipid species were lower in the hippocampus of DHA supplemented compared with control animals, and principal component analyses revealed a potential dietary treatment effect for hippocampal PUFA. Females fed DHA had slightly more PE P-18:0_22:6 and maintained levels of PE 18:0_20:4 in the hippocampus in contrast with males fed DHA. Understanding how DHA supplementation during the perinatal and adolescent periods changes cognitive function in a sex-specific manner has important implications for determining the dietary requirements of DHA. 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引用次数: 1
摘要
最近的研究表明,在婴儿期、青春期和成年早期,补充DHA对人类记忆的影响可能因女性和男性而异,但其潜在机制尚不清楚。因此,本研究试图检查雌性和雄性青春期大鼠的空间记忆和脑脂质组学特征,无论是否食用富含DHA的饮食,这些饮食从围产期补充母鼠开始。从6周大开始,使用Morris Water Maze对青春期大鼠的空间学习和记忆进行检查,并在7周大时处死动物,以分离脑组织和血液样本。行为测试表明,在空间记忆的两个关键指标(与区域的距离和在探针测试期间在正确象限度过的时间)方面,存在显著的饮食x性别互动,雌性大鼠从补充DHA中受益最大。脂质组学分析表明,与对照动物相比,补充DHA的海马中含有花生四烯酸(ARA)和n-6二十二碳五烯酸(DPA)的磷脂物质的水平较低,主成分分析揭示了对海马PUFA的潜在饮食治疗效果。与喂食DHA的雄性相比,喂食DHA的雌性大鼠海马中的PE P-18:0_22-6略多,并保持PE 18:0_20:4的水平。了解围产期和青春期补充DHA如何以特定性别的方式改变认知功能,对确定DHA的饮食需求具有重要意义。这项研究补充了先前强调DHA对空间记忆重要性的工作,并提供了证据,证明需要进一步研究补充DHA如何导致性别特异性变化。
Sex differences in hippocampal-dependent memory and the hippocampal lipidome in adolescent rats raised on diets with or without DHA
Recent studies suggest the effects of DHA supplementation on human memory may differ between females and males during infancy, adolescence, and early adulthood, but the underlying mechanisms are not clear. As a result, this study sought to examine the spatial memory and brain lipidomic profiles in female and male adolescent rats with or without a DHA-enriched diet that began perinatally with the supplementation of dams. Spatial learning and memory were examined in adolescent rats using the Morris Water Maze beginning at 6 weeks of age and animals were sacrificed at 7 weeks of age to permit isolation of brain tissue and blood samples. Behavioral testing showed that there was a significant diet x sex interaction for two key measures of spatial memory (distance to zone and time spent in the correct quadrant during the probe test), with female rats benefiting the most from DHA supplementation. Lipidomic analyses suggest levels of arachidonic acid (ARA) and n-6 docosapentaenoic acid (DPA) containing phospholipid species were lower in the hippocampus of DHA supplemented compared with control animals, and principal component analyses revealed a potential dietary treatment effect for hippocampal PUFA. Females fed DHA had slightly more PE P-18:0_22:6 and maintained levels of PE 18:0_20:4 in the hippocampus in contrast with males fed DHA. Understanding how DHA supplementation during the perinatal and adolescent periods changes cognitive function in a sex-specific manner has important implications for determining the dietary requirements of DHA. This study adds to previous work highlighting the importance of DHA for spatial memory and provides evidence that further research needs to consider how DHA supplementation can cause sex-specific changes.