Compared with PD + PBS group, the amount of pro-inflammatory factors IL-1α, IL-1β, IL-2, MCP-1, and TNF-α in the serum of PD + MenSCs group significantly decreased after MenSCs transplantation (Fig. 5L–P, #p < 0.05, ##p < 0.01). Here, IL1B is linked to Parkinson disease.