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• W2024150322 abstract "The neurotoxic properties of the parkinsonian inducing agent 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) are dependent on its metabolic activation in a reaction catalyzed by centrally located monoamine oxidase B (MAO-B). This reaction ultimately leads to the permanently charged 1-methyl-4-phenylpyridinium species MPP(+), a 4-electron oxidation product of MPTP and a potent mitochondrial toxin. The corresponding 5-membered analogue, 1-methyl-3-phenyl-3-pyrroline, is also a selective MAO-B substrate. Unlike MPTP, the MAO-B-catalyzed oxidation of 1-methyl-3-phenyl-3-pyrroline is a 2-electron process that leads to the neutral 1-methyl-3-phenylpyrrole. MPP(+) is thought to exert its toxic effects only after accumulating in the mitochondria, a process driven by the transmembrane electrochemical gradient. Since this energy-dependent accumulation of MPP(+) relies upon its permanent charge, 1-methyl-3-phenyl-3-pyrrolines and their pyrrolyl oxidation products should not be neurotoxic. We have tested this hypothesis by examining the neurotoxic potential of 1-methyl-3-phenyl-3-pyrroline and 1-methyl-3-(4-chlorophenyl)-3-pyrroline in the C57BL/6 mouse model. These pyrrolines did not deplete striatal dopamine while analogous treatment with MPTP resulted in 65-73% depletion. Kinetic studies revealed that both 1-methyl-3-phenyl-3-pyrroline and its pyrrolyl oxidation product were present in the brain in relatively high concentrations. Unlike MPP(+), however, 1-methyl-3-phenylpyrrole was cleared from the brain quickly. These results suggest that the brain MAO-B-catalyzed oxidation of xenobiotic amines is not, in itself, sufficient to account for the neurodegenerative properties of a compound like MPTP. The rapid clearance of 1-methyl-3-phenylpyrroles from the brain may contribute to their lack of neurotoxicity." @default.
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• W2024150322 date "2007-07-01" @default.
• W2024150322 modified "2023-10-12" @default.
• W2024150322 title "Neurotoxicity studies with the monoamine oxidase B substrate 1-methyl-3-phenyl-3-pyrroline" @default.
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• W2024150322 doi "https://doi.org/10.1016/j.lfs.2007.06.014" @default.
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