SLC1A2 and Parkinson disease: Impaired glutamate uptake and reduced GLT-1 expression are found in PD animal models constructed by 6-OHDA, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), and 1-methyl-4-phenylpyridinium (MPP+) [11–14].