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Related Experiment Videos

Aluminum toxicity to the brain.

S S Krishnan1, D R McLachlan, B Krishnan

  • 1Toronto General Hospital, University of Toronto, Ontario, Canada.

The Science of the Total Environment
|April 1, 1988
PubMed
Summary

Elevated aluminum levels in the brain are linked to Alzheimer's disease (AD). This study confirms higher aluminum concentrations in AD brains, suggesting a potential pathogenic role for aluminum in AD development.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by cognitive decline.
  • The role of environmental factors, such as metal ion accumulation, in AD pathogenesis is an area of active research.

Purpose of the Study:

  • To critically review and consolidate evidence on the association between elevated brain aluminum levels and Alzheimer's disease.
  • To identify factors contributing to discrepancies in previous findings regarding brain aluminum in AD.

Main Methods:

  • Systematic review and critical analysis of published studies on brain aluminum levels in Alzheimer's disease patients and control subjects.
  • Comparative analysis of aluminum concentrations in brain tissue samples from AD and non-AD individuals.

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Main Results:

  • Multiple laboratories confirm significantly higher brain aluminum levels (greater than 4 µg/g dry weight) in Alzheimer's disease patients compared to normal subjects (approximately 1.5 µg/g dry weight).
  • Discrepancies in findings were attributed to variations in sample size and selection criteria, emphasizing the need for small sample sizes (approx. 10 mg dry weight) and specific tissue characteristics (presence of neurofibrillary tangles in AD brains, absence in controls).
  • Elevated aluminum was detected in specific brain loci, including nuclear DNA, neurofibrillary tangles, amyloid cores of senile plaques, and cerebral ferritin.

Conclusions:

  • Aluminum is found at elevated concentrations in key pathological hallmarks of Alzheimer's disease, such as neurofibrillary tangles.
  • The evidence strongly suggests that aluminum is toxic to the brain and likely plays a pathogenic role in the development of Alzheimer's disease.