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Assessing Iron Deposition in the Brains of 5xFAD Mice by Perls'/DAB Staining
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Modest amyloid deposition is associated with iron dysregulation, microglial activation, and oxidative stress

Joseph J Gallagher1, Mary E Finnegan, Belinda Grehan

  • 1Department of Physiology, Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland. jjg@caltech.edu

Journal of Alzheimer'S Disease : JAD
|October 6, 2011
PubMed

Insights

Iron dysregulation, including magnetite formation, is an early event in Alzheimer's disease (AD) pathology. This study links iron changes to microglial activation and oxidative stress in an AD mouse model.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Alzheimer's disease (AD) is linked to brain iron accumulation.
  • AD pathology involves neuroinflammation and oxidative stress, often from microglial activation.

Purpose of the Study:

  • Investigate correlations between microglial activation, oxidative stress, and iron dysregulation.
  • Examine early-stage changes in an AβPP/PS1 transgenic mouse model of AD.

Main Methods:

  • Microfocus X-ray absorption spectroscopy on brain tissue sections.
  • Histochemical analysis of microglial (CD11b, CD68) and astrocytic (GFAP) activation markers.

Main Results:

  • Identified magnetite and elevated iron levels near amyloid-β plaques.
  • Observed increased CD11b, CD68, and GFAP expression adjacent to plaques.

Conclusions:

  • Iron dysregulation, specifically magnetite presence, is an early feature of AD.
  • These iron changes correlate with glial activation and oxidative stress in AD pathogenesis.

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