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Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry (CE-ICP-MS) for Quantification of Iron Redox Species (Fe(II), Fe(III))
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Iron in the Hallervorden-Spatz syndrome

A H Koeppen1, A C Dickson

  • 1Neurology Services, VA Medical Center, Albany, NY 12208, USA.

Pediatric Neurology
|September 12, 2001
PubMed

Insights

Hallervorden-Spatz syndrome involves iron accumulation in the globus pallidus and substantia nigra. Research suggests this iron excess may be secondary to a primary axonal disorder, not the main cause.

Area of Science:

  • Neuroscience
  • Neuropathology
  • Neurodegenerative Diseases

Background:

  • Hallervorden-Spatz syndrome (HSS) is characterized by dark discoloration of the globus pallidus and substantia nigra pars reticularis due to iron accumulation.
  • Iron is detected in microglia, macrophages, and neurons, with axonal spheroids also showing positive iron reactions.
  • While iron-rich areas like the red nucleus remain unaffected, the pathogenesis of HSS has centered on excessive iron storage.

Purpose of the Study:

  • To investigate the localization of iron in the globus pallidus and substantia nigra in HSS.
  • To explore the relationship between iron accumulation and axonal pathology in HSS.
  • To re-evaluate the role of iron in the pathogenesis of HSS and related disorders.

Main Methods:

  • Routine iron staining.
  • Double-label immunofluorescence microscopy for ferritin (iron marker) and phosphorylated neurofilament protein (axonal marker).

Main Results:

  • Iron is found in microglia, macrophages, scattered neurons, and axonal spheroids in affected areas.
  • Ferritin-reactive microglial and oligodendroglial processes are closely associated with axons in normal globus pallidus and substantia nigra.
  • Iron accumulation is not unique to HSS, and some cases may represent pallidonigroluysian atrophy.

Conclusions:

  • A primary axonal disorder may lead to iron seepage into the axoplasm in HSS.
  • Iron accumulation is likely an epiphenomenon, contributing to but not solely causing the axonal disease.
  • Pallidal and nigral iron excess is not pathognomonic for HSS, necessitating careful differential diagnosis.

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