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Related Experiment Videos

Pathological proteins in senile plaques

P L McGeer1, A Klegeris, D G Walker

  • 1Kinsmen Laboratory of Neurological Research, University of British Columbia, Vancouver, Canada.

The Tohoku Journal of Experimental Medicine
|November 1, 1994
PubMed
Summary

Alzheimer disease plaques involve immune proteins. Senile plaques, distinct from diffuse deposits, contain activated microglia and membrane attack complex components, suggesting a role for inflammation in disease progression.

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Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • Alzheimer disease (AD) is characterized by beta-amyloid protein deposits.
  • These deposits, diffuse and senile plaques, comprise numerous extracellular proteins, many linked to the immune system.
  • Understanding the transition from diffuse deposits to senile plaques is crucial for AD pathogenesis.

Purpose of the Study:

  • To elucidate the molecular differences between diffuse deposits and senile plaques in Alzheimer disease.
  • To investigate the role of immune components and microglial activation in plaque maturation.

Main Methods:

  • Comparative analysis of protein components in diffuse deposits and senile plaques.
  • Investigation of microglial activation and respiratory burst activity.

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  • Assessment of inhibitory effects of antibodies and anti-inflammatory agents on microglial activation.

    • Main Results:

    • Senile plaques contain additional components compared to diffuse deposits, including dystrophic neurites, activated microglia, and membrane attack complex elements.
    • Activated microglia exhibit respiratory burst activity, producing reactive oxygen species.
    • Complement receptor antibodies significantly inhibited microglial activation, while dapsone and indomethacin showed weak inhibition.

    Conclusions:

    • Senile plaques represent a more complex inflammatory stage than diffuse deposits, involving activated microglia and complement.
    • Microglial activation and the resulting oxidative stress may contribute to Alzheimer disease progression.
    • Targeting microglial activation and complement pathways presents potential therapeutic strategies for Alzheimer disease.