Abstract
Four monkeys were exposed to a total of 8 g each of manganese as oxide by repetitive subcutaneous injections during 5 months, after which they were left for 1 week to 6 months before they were sacrificed. All animals developed hyperactive behaviour after about 2 months. About 5 months after the start of the exposure the animals became hypoactive with an unsteady gait, and subsequently an action tremor appeared in some of the animals. The animals lost power in both upper and lower limbs and the movements of the hands and feet were very clumsy. The serum content of manganese rose 10–40 times during the exposure time and the content in brain was generally increased more than 10 times, with the highest content found in globus pallidus and putamen. The observed neurochemical effects were also largest in globus pallidus and putamen. In these regions there was a considerable depletion of dopamine and 3,4-dihydroxyphenylacetic acid, while the homovanillic acid content remained almost unchanged. A severe neuronal cell loss was observed in globus pallidus but not in other regions. This is in accordance with results from the most recent neuropathological study of a human suffering from chronic manganese poisoning [Yamada et al. (1986) Acta Neuropathol 70: 273–278] where globus pallidus was devoid of neuronal cells while the content of pigmented cells in substantia nigra was normal. Our data suggest a reduction in number of dopaminergic nerve terminals, as the activity of the dopamine synthesizing enzyme DOPA-decarboxylase was also lowered. In addition to the effects on the dopaminergic system, a reduced content of 5-hydroxyindole acetic acid was observed in the putamen and globus pallidus. Moreover neurotensin, a neuropeptide with functional connection to the dopaminergic system, was found to be reduced in the putamen. It was remarkable that all the neurochemical effects seen in the putamen were more or less absent from the caudate nucleus. These observations are discussed in relation to what has been found in Parkinsonian and MPTP-lesioned brains.
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Eriksson, H., Mägiste, K., Plantin, LO. et al. Effects of manganese oxide on monkeys as revealed by a combined neurochemical, histological and neurophysiological evaluation. Arch Toxicol 61, 46–52 (1987). https://doi.org/10.1007/BF00324547
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DOI: https://doi.org/10.1007/BF00324547