Alstoscholarisines A-E (1-5), five unprecedented monoterpenoid indole alkaloids with 6/5/6/6/6 fused-bridge rings, were isolated from Alstonia scholaris. They promoted adult neuronal stem cells (NSCs) proliferation significantly, in which the most active one (1) functioned from a concentration of 0.1 μg/mL in a dosage-dependent manner. Furthermore, 1 enhanced NSC sphere formation and neurogenic fate commitment through activation of a Wnt signaling pathway and promoted NSC differentiation but did not affect proliferation of neuroblastoma cells.
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Yang et al. (2014) studied this question.
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