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PN attenuates 6-OHDA-induced cytotoxicity in SH-SY5Y cells. (A) MTT analysis of SH-SY5Y cells treated with different doses of PN alone for 24 h. (B) MTT analysis of 6-OHDA-treaed SH-SY5Y cells pretreated with different doses of PN. (C) LDH release was assessed using a commercial kit. (D) Cell apoptosis was determined through Annexin V-FITC/PI double-staining. * P<0.05 vs. 6-OHDA-untreated cells; # P<0.05 vs. PN-untreated cells.
