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- W2020512685 abstract "Defects in complex I and α-ketoglutarate dehydrogenase (α-KGDH) occur in the substantia nigra in Parkinson's disease (PD). Isoquinoline derivatives structurally related to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) or 1-methyl-4-phenylpyridinium (MPP+) are implicated in the cause of PD as endogenous toxins and are inhibitors of complex I. However, their effects on α-KGDH and other mitochondrial non-respiratory chain enzymes are unknown. We have examined the effects of six isoquinoline derivatives (isoquinoline, N-methylisoquinolinium, N-n-propylisoquinolinium, 1,2,3,4-tetrahydroisoquino-line, N-methyl-1,2,3,4-tetrahydroisoquinoline and salsolinol) and MPP+ on the activities of α-KGDH, citrate synthase (CS) and glutamate dehydrogenase (GDH) in mitochondrial fragments from rat forebrain. None of the compounds examined had any effect on CS or GDH activity. In contrast, all isoquinoline derivatives investigated and MPP+ inhibited α-KGDH activity in a concentration-dependent manner with IC50s ranging from 2.0 to 18.9 mM. MPP+ was previously shown to inhibit α-KGDH, but this is the first report of inhibition of α-KGDH by isoquinoline derivatives. These findings may represent an additional mechanism contributing to mitochondrial dysfunction and cell death in Parkinson's disease." @default.
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- W2020512685 title "Inhibition of α-Ketoglutarate dehydrogenase by isoquinoline derivatives structurally related to 1 -methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)" @default.
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- W2020512685 doi "https://doi.org/10.1097/00001756-199505300-00008" @default.
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