Compared with the MPTP group, the MPTP + Cur group significantly improved the expression of TH in the SN (p < 0.001 and p < 0.001, respectively) and striatum (p < 0.001 and p < 0.0161, respectively), and the above experiments confirmed that curcumin could improve the motor symptoms of Parkinson’s disease (Figure 2). The gene discussed is TH; the disease is Parkinson disease.