This cell biology study screened 40,167 small molecules for effects on manganese content in a mouse striatal neuron line and used 41 validated hits as a toolbox in human stem-cell-derived dopaminergic neurons. More mature dopaminergic neurons accumulated more manganese than earlier neuroprogenitors, and several small molecules acted differently at the two stages. The authors frame this as evidence that neurons regulate their manganese content as they develop.
Key numbers
- Screen size: 40,167 small molecules; 41 validated manganese-modifying molecules (Abstract).
- Day 26 post-mitotic dopaminergic neurons accumulated significantly more intracellular manganese than day 12 floor-plate neuroprogenitors after the same exposure (p < 0.05) (Results, p. 3; Fig. 5).
- Of nine molecules tested in human cells, 3 had similar activity at both stages, 4 were more active in progenitors and 2 were active only in mature neurons (Results, p. 3).
This paper reports no numerical findings relevant to manganese exposure in food, water or people.
Methods (brief)
Intracellular manganese was measured with a fura-2 based fluorescence extraction assay after manganese chloride exposure in 384-well format. Human induced pluripotent stem cells were differentiated toward the floor-plate dopaminergic lineage and tested at days 12 and 26.
Evidence fitness
The study supports mechanistic statements about cell-level regulation of manganese in a neuron type the authors describe as especially vulnerable to manganese. It does not inform dietary exposure or dose-response in people.
Limitations
In vitro only. Exposure concentrations in the text are printed with ambiguous units in the available copy and are not reproduced here.
Related evidence
Update history
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