Selective dopaminergic neurotoxicity of isoquinoline derivatives related to Parkinson's disease: studies using heterologous expression systems of the dopamine transporter

Biochemical Pharmacology
Alexander StorchJohannes Schwarz

Abstract

Endogenous isoquinoline (IQ) derivatives structurally related to the selective dopaminergic neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and its active metabolite 1-methyl-4-phenylpyridine (MPP(+)) may contribute to dopaminergic neurodegeneration in Parkinson's disease. We addressed the importance of the DAT molecule for selective dopaminergic toxicity by testing the differential cytotoxicity of 22 neutral and quaternary compounds from three classes of isoquinoline derivatives (3, IQs; 4,3,4-dihydroisoquinolines and 15, 1,2,3,4-tetrahydroisoquinolines) as well as MPP(+) in non-neuronal and neuronal heterologous expression systems of the DAT gene (human embryonic kidney HEK-293 and mouse neuroblastoma Neuro-2A cells, respectively). Cell death was estimated using the MTT assay and the Trypan blue exclusion method. Nine isoquinolines and MPP(+) showed general cytotoxicity in both parental cell lines after 72hr with half-maximal toxic concentrations (TC(50) values) in the micromolar range. The rank order of toxic potency was: papaverine>salsolinol=tetrahydropapaveroline=1-benzyl-TIQ=norsalsolinol>tetrahydropapaverine>2[N]-methyl-salsolinol>2[N]-methyl-norsalsolinol>2[N]-Me-IQ(+)=MPP(+). Besides MPP(+), only the 2[...Continue Reading

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