Not only neuronal death but also neuritic atrophy and synaptic loss underlie the pathogenesis of Alzheimer’s disease as direct causes of the memory deficit. Extracts of Siberian ginseng (the rhizome of Eleutherococcus senticosus) were shown to have protective effects on the regeneration of neurites and the reconstruction of synapses in rat cultured cortical neurons damaged by amyloid β (Aβ)(25–35), and eleutheroside B was one of the active constituents. In this study, a comprehensive evaluation of constituents was conducted to explore active components from Siberian ginseng which can protect against neuritic atrophy induced by Aβ(25–35) in cultured rat cortical neurons. The ethyl acetate, n-butanol and water fractions from the methanol extract of Siberian ginseng showed protective effects against Aβ-induced neuritic atrophy. Twelve compounds were isolated from the active fractions and identified. Among them, eleutheroside B, eleutheroside E and isofraxidin showed obvious protective effects against Aβ(25–35)-induced atrophies of axons and dendrites at 1 and 10 μM.
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This work was supported by a Grant-in-Aid for Scientific Research (B), No. 21406004 in 2009–2010, from the Japan Society for the Promotion of Science and by Expansion Program, Regional Innovation Cluster Program, Global Type (II), “Hokuriku Innovation Cluster for Health Science” from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Bai, Y., Tohda, C., Zhu, S. et al. Active components from Siberian ginseng (Eleutherococcus senticosus) for protection of amyloid β(25–35)-induced neuritic atrophy in cultured rat cortical neurons. J Nat Med 65, 417–423 (2011). https://doi.org/10.1007/s11418-011-0509-y
- Siberian ginseng
- Eleutherococcus senticosus
- Amyloid β
- Neuritic atrophy
- Eleutheroside B
- Eleutheroside E