Journal
REJUVENATION RESEARCH
Volume 20, Issue 1, Pages 34-43Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/rej.2016.1830
Keywords
epimedium; polysaccharide; neurotoxicity; neurodegeneration; oxidative stress; polyglutamine
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Funding
- National Natural Science Foundation of China [81274048, 81403081]
- National High-Tech R & D Program of China (863 Program) [2014AA022001]
- Guangdong Province Department of Education [2015KGJHZ022]
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Epimedium has been traditionally used to treat a variety of medical conditions, including neurological disorders. In this study, an acidic polysaccharide EbPS-A1 is isolated from Epimedium brevicornum and found to contain mainly galacturonic acid, galactose, and rhamnose but also arabinose and glucuronic acid. Using Caenorhabditis elegans models, we show that EbPS-A1 is capable of inhibiting behavioral dysfunction mediated by polyglutamine (polyQ), which is implicated in several neurodegenerative disorders such as Huntington's disease. Interestingly, EbPS-A1 does not inhibit polyQ aggregation or extend lifespan in the nematodes; it does, however, improve the survival under increased oxidative stress of both polyQ and wild-type nematodes intoxicated by paraquat. Further studies reveal that EbPS-A1 is capable of not only scavenging free radicals in vitro but also reducing reactive oxygen species levels, enhancing antioxidant enzyme activities, and decreasing lipid peroxidation product in C. elegans models. Together, these results suggest that the protective effect of Epimedium polysaccharide against polyQ-mediated neurotoxicity is likely due to its antioxidant function.
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