Summary
1-Methyl-4-phenylpyridinium (MPP+), the active metabolite of 1-Methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) is taken up into dopaminergic terminals and selectively destroys dopaminergic neurons, serving as a valuable tool in animal model of Parkinson's disease. Cocultures from ventral mesencephalon and neostriatum of embryonic C57/BL6 mouse brains were used to study the sensitivity of dopaminergic neurons to the toxic agent MPP+. Cultures were grown for 9 days in vitro and exposed to different concentrations of MPP+ for various times. Treatment with (0.1–1.0 μM) MPP+ for 24 hours decreased3H-dopamine (3H-DA) uptake with an IC50 at 0.2 μM. Exposure of cells to 1 μM MPP+ over time decreased the+H-DA uptake to 38% of controls within the first two hours of incubation and to 8% after 48 hours. Loss of tyrosine hydroxylase (TH) positive cells became evident at 0.1 μM MPP+ (80% of control) leading to maximal toxicity at 10 μM (20% of control). MPP+ reduced the dopamine content in the cultures in a dose dependent manner (IC50 at 0.1 μM) and failed to show reversibility in recovery studies. These findings provide evidence that exposure of MPP+ even at low concentrations and for short time in our coculture model results in irreversible toxicity for dopaminergic neurons.
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Koutsilieri, E., Chan, W.W., Reinitzer, D. et al. Functional changes in cocultures of mesencephalon and striatal neurons from embryonic C57/BL6 mice due to low concentrations of 1-Methyl-4-Phenylpyridinium (MPP+). J. Neural Transmission 94, 189–197 (1993). https://doi.org/10.1007/BF01277024
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DOI: https://doi.org/10.1007/BF01277024