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Related Experiment Videos

Early complement activation increases in the brain in some aged normal subjects.

David A Loeffler1, Dianne M Camp, Michael B Schonberger

  • 1Division of Neurology, William Beaumont Hospital Research Institute, Royal Oak, MI 48073, USA. DLoeffler@beaumont.edu

Neurobiology of Aging
|June 24, 2004
PubMed
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Complement activation, measured by C4d and iC3b, is significantly increased in Alzheimer's disease (AD) brains. This suggests early complement system activation may drive AD development, even in some elderly individuals without AD.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Complement activation is implicated in Alzheimer's disease (AD) pathogenesis.
  • Understanding early complement system involvement is crucial for AD research.

Purpose of the Study:

  • To compare early complement activation markers (C4d, iC3b) in normal versus AD brain specimens.
  • To investigate the relationship between aging, complement activation, and AD.

Main Methods:

  • Quantification of C4d and iC3b protein concentrations in brain regions (hippocampus, entorhinal cortex, temporal cortex, parietal cortex, cerebellum) from AD and age-matched normal subjects.
  • Comparison of complement levels between younger normal, aged normal, and AD brain tissues.

Main Results:

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  • C4d and iC3b levels were significantly elevated (2.3- to 4.6-fold) in AD specimens compared to aged normal controls across multiple brain regions.
  • Complement protein concentrations were generally lowest in the cerebellum.
  • No significant differences in C4d and iC3b were found between younger and aged normal brain tissues, but some aged normal specimens showed markedly increased levels.
  • Normal subject age showed a moderate positive association with C4d and iC3b concentrations in the hippocampus.

Conclusions:

  • Alzheimer's disease brains exhibit significantly increased early complement activation.
  • Elevated complement activation in some elderly individuals may precede or promote AD development.
  • The cerebellum may be less susceptible to complement-mediated changes in AD.