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Human-brain ferritin studied by muon spin rotation: a pilot study.

Lucia Bossoni1, Laure Grand Moursel2,3, Marjolein Bulk2,3,4

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|September 6, 2017
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Summary

This study used muon spin rotation to analyze brain ferritin in Alzheimer's disease (AD) patients. AD patient ferritin contained a mineral with higher magnetic anisotropy than healthy controls, suggesting altered iron storage in AD.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Materials Science

Background:

  • Ferritin is an iron-storage protein crucial for cellular iron homeostasis.
  • Altered iron metabolism and ferritin composition are implicated in neurodegenerative diseases like Alzheimer's disease (AD).
  • Understanding the mineral core of ferritin in AD is vital for elucidating disease mechanisms.

Purpose of the Study:

  • To investigate the spin dynamics and mineral core composition of brain ferritin in Alzheimer's disease (AD) patients.
  • To compare ferritin from AD patients with that from healthy controls and a reference sample.
  • To explore potential correlations between ferritin's magnetic properties and AD.

Main Methods:

  • Muon spin rotation spectroscopy was employed to probe the spin dynamics of ferritin.
  • A model based on Néel theory of superparamagnetism was developed to interpret muon spin relaxation rates.
  • Ferritin samples were isolated from the brains of AD patients and healthy controls, with horse-spleen ferritin used as a reference.

Main Results:

  • Preliminary observations indicate differences in the mineral core composition of ferritin between AD patients and healthy controls.
  • Healthy control ferritin cores are consistent with ferrihydrite.
  • Ferritin from AD patients contains a crystalline phase with significantly larger magnetocrystalline anisotropy, potentially magnetite or maghemite.

Conclusions:

  • The findings suggest altered iron mineral composition within brain ferritin in Alzheimer's disease.
  • The increased magnetocrystalline anisotropy in AD ferritin may indicate a different iron storage state.
  • Further research is needed to confirm the exact mineral phases and their role in AD pathogenesis.