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Related Experiment Videos

Complement gene expression in human brain: comparison between normal and Alzheimer disease cases.

D G Walker1, P L McGeer

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

Brain Research. Molecular Brain Research
|June 1, 1992
PubMed
Summary

Alzheimer disease (AD) brains show increased expression of complement genes C3 and C4. This suggests localized synthesis of these complement proteins within the human brain, though activation factors remain unknown.

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Area of Science:

  • Neuroscience
  • Immunology
  • Molecular Biology

Background:

  • Complement proteins are found in Alzheimer disease (AD) brains, but their source is unclear.
  • The role of the complement system in AD pathogenesis is an area of active investigation.

Purpose of the Study:

  • To investigate the expression and potential localized synthesis of complement genes (C1q, C3, C4) in human brain tissue from AD and control cases.
  • To quantify differences in C3 and C4 mRNA levels between AD and normal brain samples.

Main Methods:

  • RNA extraction from post-mortem temporal cortex samples.
  • Northern hybridization analysis to detect C3 and C4 transcripts.
  • Polymerase chain reaction (PCR) amplification of brain-derived complementary DNA (cDNA) for C1q, C3, and C4.

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  • Semi-quantitative PCR assay to compare mRNA abundance.

    • Main Results:

    • C3 and C4 transcripts were detected in human brain RNA.
    • Mean expression of C3 mRNA was 3.01-fold higher in AD samples compared to controls.
    • Mean expression of C4 mRNA was 3.27-fold higher in AD samples compared to controls.

    Conclusions:

    • These findings indicate that major complement components (C3, C4) can be synthesized locally within the human brain.
    • The study supports a potential role for the complement system in AD, but the triggers for complement activation in AD remain to be identified.