TH and Parkinson disease: To demonstrate the feasibility and therapeutic potential of this strategy in this PD mouse model, we next assessed at different time‐points whether we were still able to detect Nile Red‐loaded aNPs within tyrosine hydroxylase (TH)‐positive cells, a marker for dopaminergic neurons, without evident cytotoxicity at 24 h, 48 h, 1 and 4 month after intracerebral injection (Figure S3).