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ER stress and autophagy in PD. Phosphorylation of EIF2AK3 can be induced by both SNCA and 6-OHDA. Although phosphorylated EIF2S1 is seen in PD brain but not in the α-synucleinopathy mouse model, EIF2S1-ATF4 signaling upregulates PARK2. Interaction of PARK2 and BECN1 enhances autophagic clearance of SNCA. Moreover, exogenous XBP1s and XBP1 rescue MPP+/MPTP-mediated dopaminergic neuron degeneration.
