Summary
1-Methyl-4-phenylpyridinium (MPP+), the active metabolite of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) serves as a valuable tool in animal models of Parkinson's disease. Primary cell cultures of mesencephalon from C57/B16 mice were used to investigate the effects of various dopaminergic neurotoxins on the intracellular calcium metabolism. MPP+ was compared to its precursor MPTP and a structural analogue paraquat (methylviologen). Direct addition of these neurotoxins (10 μM) to fura-2-labeled cells did not change intracellular calcium concentrations in the presence of 1 mM extracellular calcium. When mesencephalic neurons were exposed to the compounds for 24 hours, only MPP+ led to an increase in calcium concentration in the absence and presence of extracellular calcium (36%, p<0.05 and 47%, p<0.01 versus control group). Intracellular calcium concentrations in cortical cultures devoid of dopaminergic cells were not changed by the above neurotoxins. Thus MPP+ is shown to selectively increase intracellular calcium concentrations in mesencephalic cultures.
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Chen, T.S., Koutsilieri, E. & Rausch, W.D. MPP+ selectively affects calcium homeostasis in mesencephalic cell cultures from embryonal C57/B16 mice. J. Neural Transmission 100, 153–163 (1995). https://doi.org/10.1007/BF01271538
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DOI: https://doi.org/10.1007/BF01271538