Abstract
As a result of chronic manganese treatment of rats from conception onwards, a decrease was observed in the uptake of dopamine, but not of noradrenaline or serotonin, by synaptosomes isolated from hypothalamus, striatum, and midbrain and in choline uptake by hypothalamic synaptosomes obtained from 70-90-day-old animals. In 100-120-day-old manganese-treated rats the only difference observed was increased choline uptake by striatal synaptosomes. All comparisons were with age-matched controls. These results, which are consistent with views of a dopaminergic and cholinergic involvement in manganese encephalopathy, point out that changes in these systems are observable only at specific times during manganese intoxication.
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