Manganese intoxication in the rhesus monkey: a clinical, imaging, pathologic, and biochemical study

Neurology
C W OlanowD P Perl

Abstract

We gave three adult rhesus monkeys seven IV injections of manganese chloride at approximately 1-week intervals. We evaluated neurologic status by serial clinical examinations and performed a levodopa test if the animal developed features of basal ganglia dysfunction. After the animals were killed, we performed neuropathologic, neurochemical, and laser microprobe mass analysis (LAMMA) studies. Two of three animals developed a parkinsonian syndrome characterized by bradykinesia, rigidity, and facial grimacing suggestive of dystonia but not tremor. Neither animal responded to levodopa. Autopsy demonstrated gliosis primarily confined to the globus pallidus (GP) and the substantia nigra pars reticularis (SNr). We detected focal mineral deposits throughout the GP and SNr, particularly in a perivascular distribution. LAMMA studies noted that mineral deposits were primarily comprised of iron and aluminum. The severity of pathologic change correlated with the degree of clinical dysfunction. These studies demonstrate that, in contrast to Parkinson's disease (PD) and MPTP-induced parkinsonism, manganese primarily damages the GP and SNr and relatively spares the nigrostriatal dopaminergic system. Further, the results suggest that Mn-induce...Continue Reading

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