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Infectious etiology of neuritic (senile) plaques in mice

H M Wiśniewski, M E Bruce, H Fraser

    Science (New York, N.Y.)
    |December 12, 1975
    PubMed

    Insights

    Scrapie infection in female VM mice led to the development of primitive, classical, and amyloid plaques in the brain after a long incubation period. Control mice did not exhibit these neuropathological changes.

    Area of Science:

    • Neuroscience
    • Pathology
    • Infectious Diseases

    Background:

    • Scrapie is a transmissible spongiform encephalopathy.
    • The neuropathology of scrapie infection is not fully understood.
    • Prion diseases like scrapie are characterized by protein misfolding and aggregation.

    Purpose of the Study:

    • To investigate the neuropathological changes in the brains of mice infected with the scrapie agent.
    • To identify and characterize the types of plaques formed during scrapie infection.
    • To compare the brains of infected mice with control subjects.

    Main Methods:

    • Inbred female VM mice were infected with the scrapie agent.
    • Bodian silver impregnation and electron microscopy were used for brain analysis.
    • Brains were examined after an incubation period of 587-655 days.

    Main Results:

    • Numerous primitive, classical, and amyloid plaques were observed in the brains of scrapie-infected mice.
    • These plaques were present after a prolonged incubation period.
    • No plaques of any type were detected in the control mice.

    Conclusions:

    • Scrapie infection induces the formation of various types of plaques in the mouse brain.
    • The presence of plaques is a hallmark of scrapie neuropathology.
    • These findings contribute to understanding the progression of prion diseases.

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