| Summary: | 碩士 === 國立政治大學 === 神經科學研究所 === 100 === Ludwigia octovalvis (Jacq.) P. H. Raven has been widely used as a spice and herbal medicine in Taiwan. It has been proved to possess many biological activities, antioxidative, anti-hepatotoxic, anti-bacterial and anticancer properties, for example. In this research, Ludwigia octovalvis extract (LOE) was used in two different diet conditions, one is standard diet (15% yeast and 15% dextrose), and the other is calorie restriction (5% yeast and 5% dextrose). The effect of LOE on the lifespan of the flies was estimated using w1118 and Canton-S strains of Drosophila melanogaster. We also evaluated the effects of 0.1% or 0.5% of LOE on food intake, fecundity, locomotor activity, cognitive performance, anti-oxidative stress and age-related gene expression in flies under standard diet. Our results showed that LOE could extend the lifespan of female flies on both species without affecting the fecundity and locomotor activity. Intriguingly, LOE attenuated the cognitive decline in both male and female flies. The longevity effect of LOE, however, was vanished when the lifespan of the flies was examined under CR diet, suggesting that LOE may extend lifespan through a CR-related pathway. LOE also increased resistance of paraquat-induced oxidative stress and down regulated the mRNA expression of sod1, sod2, cat, dilp2 and dilp3 in the flies.
In summary, our results indicated that LOE may extend lifespan through: (1) a CR-related pathway. (2) regulation of Insulin/IGF-1 signaling. (3) increase of anti-oxidative stress.
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