Paeoniflorin (PF) is the major active ingredient in the traditional Chinese medicine Radix. It plays a neuroprotective role by regulating autophagy and the ubiquitin-proteasome degradation pathway. In this study, we found PF significantly reduced cell damage caused by MPP+, returning cells to normal state. Cell viability significantly improved after 24 h exposure to RAPA and PF in the MPP+ group (allP<0.01). CAT and SOD activities were significantly decreased after PF and RAPA treatment, compared with MPP+ (P<0.001). In addition, MPP+ activated both LC3-II and E1; RAPA increased LC3-II but inhibited E1. PF significantly upregulated both LC3-II (autophagy) and E1 (ubiquitin-proteasome pathway) expression (P<0.001), promoted degradation ofα-synuclein, and reduced cell damage. We show MPP+ enhanced immunofluorescence signal of intracellularα-synuclein and LC3. Fluorescence intensity ofα-synuclein decreased after PF treatment. In conclusion, these data show PF reversed the decline of proteasome activity caused by MPP+ and significantly upregulated both autophagy and ubiquitin-proteasome pathways, promoted the degradation ofα-synuclein, and reduced cell damage. These findings suggest PF is a potential therapeutic medicine for neurodegenerative diseases.
Progress of ubiquitin-proteasome system in the pathophysiology of heart failure and the intervention of traditional Chinese medicine