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- W1995015392 abstract "1-methyl-4-phenylpyridinium ion (MPP+) was tested for its effects upon dopamine level after incubating striatal synaptosomes in medium with and without reserpine. In the absence of reserpine, MPP+ enhanced the total incubation mixture dopamine level when tyrosine was present in the medium but that enhancing effect was considerably weaker when tyrosine was replaced by alpha methyl p-tyrosine. 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) also had effects upon dopamine but likely due to MPP+, which was formed from MPTP by free mitochondrial MAO present in the tissue preparation. The incubation mixture dopamine level was drastically reduced by the addition of only reserpine and its presence in the medium markedly raised the ability of MPP+ to increase dopamine; the effects of MPTP in this medium were weaker than those of MPP+. Pargyline also raised dopamine levels under these conditions but only at concentrations much higher than those of MPP+. The particulate uptake of MPP+, at several medium concentrations, and the corresponding value of dopamine increase above the basal level were determined; the dopamine increase in p-moles was much greater than the p-moles of MPP+ uptake. These results indicate that, in the presence of reserpine, MPP+ has a potent action and that may lead to a release of intraneuronal free dopamine; this action is also likely to be independent of the countertransport from MPP+ uptake. The possibility of MPP+ being a potent inhibitor of intraneuronal MAO may have to be considered." @default.
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- W1995015392 date "1991-01-01" @default.
- W1995015392 modified "2023-09-26" @default.
- W1995015392 title "Reserpine induced intraneuronal dopamine oxidation: reversal by MPP+ action" @default.
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- W1995015392 doi "https://doi.org/10.1016/0024-3205(91)90366-j" @default.
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