CAT and Parkinson disease: At the same time, exosomes can participate in cell-to-cell communication in addition, exosomes can be loaded with proteins, RNA, and other small molecule drugs for targeted therapy, such as exosomes carrying catalase, RAD51-siRNA, miR-214, long non-coding RNA (LncRNA)-H19, doxorubicin is used in the treatment of Parkinson’s disease, prostate cancer, breast cancer and other diseases (Wu et al., 2017; Tai et al., 2018) (Figure 1).