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Methylmercury poisoning in common marmosets--a study of selective vulnerability within the cerebral cortex.

Neuropathological lesions found in chronic human Minamata disease tend to be localized in the calcarine cortex of occipital lobes, the pre- and postcentral lobuli, and the temporal gyri. The mechanism for the selective vulnerability is still not clear, though several hypotheses have been proposed. One hypothesis is vascular and postulates that the lesions are the result of ischemia secondary to compression of sulcal arteries from methylmercury-induced cerebral edema. To test this hypothesis, we studied common marmosets because the cerebrum of marmosets has 2 distinct deep sulci, the calcarine and Sylvian fissures. MRI analysis, mercury assays of tissue specimens, histologic and histochemical studies of the brain are reported and discussed. Brains sacrificed early after exposure to methylmercury showed high contents of methylmercury and edema of the cerebral white matter. These results may explain the selective cortical degeneration along the deep cerebral fissures or sulci.[1]

References

  1. Methylmercury poisoning in common marmosets--a study of selective vulnerability within the cerebral cortex. Eto, K., Yasutake, A., Kuwana, T., Korogi, Y., Akima, M., Shimozeki, T., Tokunaga, H., Kaneko, Y. Toxicologic pathology. (2001) [Pubmed]
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