Abstract
We have previously shown that sera from patients with Alzheimer’s disease (AD) contain antibodies to the cell bodies (perikarya; PK) of purely cholinergicTorpedo neurons, and that repeated immunization of rats with this neuronal preparation for over a year induces learning and memory impairments. In the present study, we examined the brain morphology of cholinergic PK immunized rats relative to controls. Immunohistochemical studies of the brains of these rats revealed the accumulation of IgG in specific areas, such as, the hippocampus. Parallel histochemical studies demonstrated significant changes in the hippocampus, and in white matter areas. They included large vacuoles and necrotic nuclei in the granular layer of the dentate gyrus, tangle-like appearance in some pyramidal neurons of the hippocampus, and vacuolar degeneration accompanied by oligodendroglia hypertrophy in white matter tracts, such as, the corpus callosum and fimbria. In contrast, immunization withTorpedo cholinergic nerve terminals, that has no cognitive effects on the rat, also did not induce brain morphological changes. These findings suggest that the learning and memory deficits induced by immunizing rats with cholinergic PK are related to the observed brain morphological changes, and support the hypothesis that the antibodies to cholinergic neurons found in the sera of AD patients may play a role in neuronal degeneration in this disease.
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Michaelson, d.M., Kadar, T., Weiss, Z. et al. Immunization with cholinergic cell bodies induces histopathological changes in rat brains. Molecular and Chemical Neuropathology 13, 71–80 (1990). https://doi.org/10.1007/BF03159909
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DOI: https://doi.org/10.1007/BF03159909