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Melanized dopaminergic neurons are differentially susceptible to degeneration in Parkinson's disease

Abstract

In idiopathic Parkinson's disease massive cell death occurs in the dopamine-containing substantia nigra1,24. A link between the vulnerability of nigral neurons and the prominent pigmentation of the substantia nigra, though long suspected, has not been proved2. This possibility is supported by evidence that N-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and its metabolite MPP+, the latter of which causes destruction of nigral neurons, bind to neuromelanin3,4. We have directly tested this hypothesis by a quantitative analysis of neuromelanin-pigmented neurons in control and parkinsonian midbrains. The findings demonstrate first that the dopamine-containing cell groups of the normal human midbrain differ markedly from each other in the percentage of neuromelanin-pigmented neurons they contain. Second, the estimated cell loss in these cell groups in Parkinson's disease is directly correlated (r = 0.97, P = 0.0057) with the percentage of neuromelanin-pigmented neurons normally present in them. Third, within each cell group in the Parkinson's brains, there is greater relative sparing of non-pigmented than of neuromelanin-pigmented neurons. This evidence suggests a selective vulnerability of the neuromelanin-pigmented subpopulation of dopamine-containing mesencephalic neurons in Parkinson's disease.

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Hirsch, E., Graybiel, A. & Agid, Y. Melanized dopaminergic neurons are differentially susceptible to degeneration in Parkinson's disease. Nature 334, 345–348 (1988). https://doi.org/10.1038/334345a0

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