α-Synuclein and p62 degradation by autophagy is impaired in cells harboring mitochondrial dysfunction. (A) Immunoblot for p62 from CT and sPD cybrid cells cultured in S+ or S− conditions and treated with or without lysosomal inhibitors (NL). (B) Densitometric analysis of p62 levels (n= 6, **P< 0.01 versus S+ CT cybrids; #P< 0.05, versus S− CT cybrids). (C and E) Immunoblots for α-synuclein oligomeric forms from CT and sPD cybrid cells cultured in S+ or S− conditions and treated with or without lysosomal inhibitors (NL). Representative blots of Triton X-100-soluble oligomeric species (C) and Triton X-100-insoluble, SDS-resistant oligomeric species (E). The arrow indicates band of tetrameric form of α-synuclein. (D and F) Densitometric analysis of α-synuclein-soluble oligomers content (D) (n= 12, *P< 0.05, **P< 0.01, versus S+ CT cybrids; ##P< 0.01, versus S+ sPD cybrids) and α-synuclein-insoluble oligomers content (F) (n= 12, ***P< 0.001, versus S+ CT cybrids).