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Background  The present study investigates the effects of ginsenosides Rh 1  and Rg 2  against 6-hydroxydopamine (6-OHDA), a neurotoxin on SH-SY5Y cells and PC-12 cells. The effects of these two ginsenosides on neuronal differentiation are also examined.    Methods  LDH assay was used to measure cell viability after exposure to 6-OHDA and ginsenosides. Neuronal differentiation was evaluated by changes in cell morphology and density of neurite outgrowths. Western blotting was used to determine the ginsenosides' effects on activation of extracellular signal-regulated protein kinases (ERKs).    Results  Rh 1  and Rg 2  attenuated 6-OHDA toxicity in SH-SY5Y cells and induced neurite outgrowths in PC-12 cells. 6-OHDA-induced ERK phosphorylation was decreased by Rh 1  and Rg 2 . 20(R)-form and 20(S)-form of the ginsenosides exerted similar effects in inducing neurite outgrowths in PC-12 cells.    Conclusion  The present study demonstrates neuroprotective effects of ginsenosides Rh 1  and Rg 2  on neuronal cell lines. These results suggest potential Chinese medicine treatment for neurodegenerative disorders ( eg  Parkinson's disease).

Neuroprotective effects of ginsenosides Rh1 and Rg2 on neuronal cells