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Related Experiment Video

Updated: Jul 4, 2025

Assessing Iron Deposition in the Brains of 5xFAD Mice by Perls'/DAB Staining
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Tissue Iron in Friedreich Ataxia.

Arnulf H Koeppen1

  • 1Research Service (151), VA Medical Center, Albany, NY 12208, USA.

Journal of Integrative Neuroscience
|January 30, 2024
PubMed
Summary

Friedreich

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A phosphorylated variant of the mast/stem cell growth factor receptor KIT is upregulated in dorsal root ganglia of Friedreich ataxia.

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Area of Science:

  • Neuroscience
  • Cardiovascular Science
  • Cell Biology

Background:

  • Friedreich ataxia (FA) is a rare genetic disorder characterized by progressive neurodegeneration and cardiomyopathy.
  • Iron accumulation and dysregulation are implicated in FA pathogenesis, but its precise role in affected tissues remains unclear.

Purpose of the Study:

  • To investigate the distribution and histopathology of iron in key tissues affected by Friedreich ataxia: the heart, dentate nucleus, and dorsal root ganglia (DRG).

Main Methods:

  • Histology and histopathology of affected tissues.
  • X-ray fluorescence mapping for iron distribution.
  • Immunohistochemistry for ferritin and ferroportin expression.

Main Results:

  • No overall increase in total iron levels was observed in affected tissues.
  • Iron-reactive inclusions and aggregates were found in myocardial fibers, leading to necrosis.
  • Dentate nucleus showed neuronal atrophy with iron retention in collapsed structures, alongside ferritin-positive oligodendrocytes and microglia.
  • Dorsal root ganglia exhibited ferritin in satellite cells and loss of ferroportin in neurons.

Conclusions:

  • Iron dysmetabolism, rather than total iron overload, contributes to tissue damage in Friedreich ataxia.
  • Specific patterns of iron distribution and altered expression of iron-related proteins (ferritin, ferroportin) are observed in the heart, dentate nucleus, and DRG in FA.
  • These findings highlight the complex role of iron in FA pathogenesis and suggest potential therapeutic targets.
Keywords:
atrophycardiomyopathydorsal root gangliaferritinferroportinfriedreich ataxiaironmitochondrial ferritin

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