showed a trendP >0.05
Meanwhile, the PD rats that received daily intranasal treatment with 75 μg or 100 μg of SP showed a significant decrease in the number of apomorphine-induced rotations when compared with hemiparkinsonian rats ( P <0.05), while PD rats that received 50 μg of SP per day intranasally showed a trend towards improvement ( P >0.05), indicating that the extent of the protective effect of SP against 6-OHDA-induced apoptosis has a positive relationship with the concentration of SP.