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Updated: Apr 6, 2026

Assessing Iron Deposition in the Brains of 5xFAD Mice by Perls'/DAB Staining
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Decrease in APP and CP mRNA expression supports impairment of iron export in Alzheimer's disease patients.

Cláudia Guerreiro1, Bruno Silva2, Ângela C Crespo3

  • 1Health Promotion and Prevention of Noncommunicable Diseases Department, Instituto Nacional de Saúde Doutor Ricardo Jorge, Lisboa, Portugal.

Biochimica Et Biophysica Acta
|July 26, 2015
PubMed
Summary

Alzheimer's disease patients show reduced expression of key iron export genes in their blood cells. This suggests impaired iron regulation may contribute to the neurodegenerative disease and its associated oxidative stress.

Keywords:
Alzheimer's diseaseCellular iron exportGene expressionIron homeostasis

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Alzheimer's disease (AD) is the primary cause of dementia globally, characterized by neurodegeneration.
  • Dysfunctional transition metal homeostasis, particularly iron (Fe), is implicated in AD pathogenesis.
  • Cellular iron efflux dysregulation is a suspected factor in AD's development.

Purpose of the Study:

  • To investigate the molecular mechanisms of iron homeostasis in Alzheimer's disease.
  • To assess the expression of iron metabolism-related genes in Alzheimer's disease patients.

Main Methods:

  • Quantitative PCR was used to measure gene expression in peripheral blood mononuclear cells (PBMCs).
  • Compared gene expression in 73 AD patients against 74 healthy controls.
  • Focused on genes involved in cellular iron regulation and export.

Main Results:

  • Significantly decreased expression of aconitase 1 (ACO1), ceruloplasmin (CP), and amyloid-beta precursor protein (APP) genes was observed in AD patients.
  • These findings indicate a downregulation of genes critical for ferroportin-mediated cellular iron export.
  • AD patients exhibited reduced expression of key iron export-related genes compared to controls.

Conclusions:

  • Supports the hypothesis of impaired iron homeostasis in Alzheimer's disease.
  • Suggests that reduced expression of iron export genes may lead to cellular iron retention.
  • Cellular iron retention and subsequent oxidative stress are potential contributors to AD pathology.