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Deposition of β/A4 protein along neuronal plasma membranes in diffuse senile plaques

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Summary

The origin of the extracellular β-amyloid protein (β/A4) found in senile plaques and the cellular mechanisms responsible for its deposition in cerebral tissues are still an unresolved issue in Alzheimer's disease. In this study we analyzed in detail the distribution of various epitopes of β/A4 in relation to local cellular elements in diffuse plaques of the hippocampal region. We also correlated our findings with the presence and distribution of non-β/A4 epitopes of the amyloid precursor protein (APP) and with synaptophysin immunoreactivity in the cortical neuropil. Discontinuous β/A4-immunoreactive deposits were found along dendrites, and around the soma of neurons included in the plaques. Furthermore, increased synaptophysin reactivity with slightly dilated synaptophysin-immunolabeled presynaptic terminals were found in diffuse plaques. APP epitopes could not be found in diffuse plaques. However, some of the APP antibodies, mainly those to the C-terminal portion of APP, and antibodies to β/A4 recognized clusters of flat vesicular profiles (0.6–1.4 μm in width and 2–3 μm in length) in the neuropil of cortical areas where plaques had developed. Our findings are compatible with a neuronal origin of β/A4 in diffuse plaques and with a primary release of β/A4 at synaptic sites along the immunostained neurites. They also suggest that diffuse plaques might be preceded by minute lesions of the neuropil where β/A4 is not yet released from the precursor molecule.

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Authors and Affiliations

  1. Abteilung für Neuropathologie, Institut für Pathologie, Schoenbeinstrasse 40, CH-4003, Basel, Switzerland

    A. Probst, D. Langui, S. Ipsen & J. Ulrich

  2. Department of Psychiatry and Neurobiology Center, Mount Sinai School of Medicine, One Gustave Lewy Place, 10029, New York, NY, USA

    N. Robakis

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  1. A. Probst
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  2. D. Langui
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  3. S. Ipsen
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  4. N. Robakis
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  5. J. Ulrich
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Probst, A., Langui, D., Ipsen, S. et al. Deposition of β/A4 protein along neuronal plasma membranes in diffuse senile plaques. Acta Neuropathol 83, 21–29 (1991). https://doi.org/10.1007/BF00294426

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  • DOI: https://doi.org/10.1007/BF00294426

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