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Visualization of Amyloid β Deposits in the Human Brain with Matrix-assisted Laser Desorption/Ionization Imaging Mass Spectrometry
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Insights into the pathogenesis and pathogenicity of cerebral amyloid angiopathy

Seth Love1, Scott Miners, Jen Palmer

  • 1Dementia Research Group, University of Bristol Institute of Clinical Neurosciences, Frenchay Hospital, Bristol BS16 1LE, UK. seth.love@bris.ac.uk

Frontiers in Bioscience (Landmark Edition)
|March 11, 2009
PubMed

Insights

Cerebral amyloid angiopathy (CAA), linked to Alzheimer's disease (AD), involves amyloid-beta (Abeta) deposition in brain vessels. Factors influencing Abeta levels and clearance impact CAA development and its associated neurological damage.

Area of Science:

  • Neuroscience
  • Neuropathology
  • Vascular Biology

Background:

  • Cerebral amyloid angiopathy (CAA) is prevalent in Alzheimer's disease (AD) and elderly individuals.
  • APOE epsilon 4 is a significant risk factor for CAA in AD.
  • Neurons are identified as the likely origin of vascular amyloid-beta (Abeta).

Purpose of the Study:

  • To elucidate the mechanisms underlying Abeta deposition in cerebral vasculature.
  • To identify factors contributing to the development and progression of CAA.
  • To understand the pathological consequences of CAA in the brain.

Main Methods:

  • Analysis of Abeta metabolism and degradation pathways.
  • Investigation of factors affecting Abeta transport across the blood-brain barrier.
  • Examination of the role of enzymes and signaling molecules in CAA pathogenesis.

Main Results:

  • CAA develops when Abeta deposition in vessel walls impedes normal clearance.
  • Increased Abeta40:Abeta42 ratio, impaired perivascular passage, and elevated Abeta concentration facilitate vascular deposition.
  • Reduced levels of Abeta-degrading enzymes and increased angiotensin-converting enzyme activity contribute to CAA.

Conclusions:

  • CAA contributes to intracerebral hemorrhage and ischemic damage.
  • Neuritic degeneration in AD is exacerbated around Abeta-laden vessels.
  • The balance of Abeta degradation and extracellular matrix regulation is crucial for brain Abeta distribution and pathogenicity.

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