Abnormal iron metabolism and oxidative stress in mice expressing a mutant form of the ferritin light polypeptide gene

Ana G. Barbeito, Holly J. Garringer, Martin A. Baraibar, Xiaoying Gao, Miguel Arredondo, Marco T. Núñez, Mark A. Smith, Bernardino Ghetti, Ruben Vidal

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

Insertional mutations in exon 4 of the ferritin light chain (FTL) gene are associated with hereditary ferritinopathy (HF) or neuroferritinopathy, an autosomal dominant neurodegenerative disease characterized by progressive impairment of motor and cognitive functions. To determine the pathogenic mechanisms by which mutations in FTL lead to neurodegeneration, we investigated iron metabolism and markers of oxidative stress in the brain of transgenic (Tg) mice that express the mutant human FTL498-499InsTC cDNA. Compared with wild-type mice, brain extracts from Tg (FTL-Tg) mice showed an increase in the cytoplasmic levels of both FTL and ferritin heavy chain polypeptides, a decrease in the protein and mRNA levels of transferrin receptor-1, and a significant increase in iron levels. Transgenic mice also showed the presence of markers for lipid peroxidation, protein carbonyls, and nitrone-protein adducts in the brain. However, gene expression analysis of iron management proteins in the liver of Tg mice indicates that the FTL-Tg mouse liver is iron deficient. Our data suggest that disruption of iron metabolism in the brain has a primary role in the process of neurodegeneration in HF and that the pathogenesis of HF is likely to result from a combination of reduction in iron storage function and enhanced toxicity associated with iron-induced ferritin aggregates in the brain.

Original languageEnglish (US)
Pages (from-to)1067-1078
Number of pages12
JournalJournal of Neurochemistry
Volume109
Issue number4
DOIs
StatePublished - May 1 2009

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Keywords

  • Animal model
  • Hereditary ferritinopathy
  • Neuroferritinopathy

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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